Geant4 LXR

Cross-Referencing   Geant4
Geant4/visualization/History

   # Category vis History
   
   See `CONTRIBUTING.rst` for details of **required** info/format for each entry,
   which **must** added in reverse chronological order (newest at the top).
   It must **not** be used as a substitute for writing good git commit messages!
   
   -------------------------------------------------------------------------------
   
   ## 2022-12-12 Ben Morgan (vis-V11-01-00)
  - Remove obsolete GNUmakefile scripts
  
  ## 2022-11-28 John Allison (vis-V11-00-04)
    - Numerous tags for 11.1 in vis sub-categories - see History files therein.
  
  ## 2022-11-25 Gabriele Cosmo (vis-V11-00-03)
  - Fixed compilation warnings for implicit type conversions on macOS/XCode 14.1.
  
  ## 2022-07-14 Ben Morgan (vis-V11-00-02)
  - Remove obsolete externals gl2ps subcategory
  
  ## 2022-03-25 Ben Morgan (vis-V11-00-01)
  - Remove retired G4tasking library as link dependency of vis libraries 
  
  ## 2021-12-10 Ben Morgan (vis-V11-00-00)
  - Change to new Markdown History format
  
  ---
  
  # History entries prior to 11.0
  
  14 November 2021 John Allison (vis-V10-07-15)
  - Category tag, comprising:
    - DAWN-V10-07-02
    - vis-HepRep-V10-07-04
    - opengl-V10-07-25
    - openinventor-V10-07-06
    - visQt3D-V10-07-12
    - raytracer-V10-07-05
    - vis_toolssg-V10-07-16
    - vistree-V10-07-03
    - VRML-V10-07-03
    - visVtk-V10-07-03
    - visexternals-V10-07-04
    - gMocren-V10-07-02
    - visman-V10-07-28
    - modeling-V10-07-16
    - vistest-V10-07-00
  - Major features:
    - New ToolsSG driver, including "in-app plotting".
      - New primitive, G4Plotter.
    - New Vtk driver.
    - New Open Inventor Qt driver.
    - Continuing development of Qt3D driver.
    - Remove obsolete drivers: HepRep(WIRED), network FukuiRenderer,
      VRML1 and network VRML2.
    - Introduce "special mesh rendering" for 3D rectangular nested
      parameterisations.
      - Implemented only in OGL and Qt3D:
        - As one coloured dot per cell randomly placed in the cell.
    - Introduce /vis/scene/add/localAxes and /vis/touchable/localAxes.
  
  12 November 2021 - Ben Morgan
  - Retire G4VIS_... preprocessor symbols in toolkit build, only required
    by obsolete GNUmake system:
    - opengl-V10-07-24
    - openinventor-V10-07-05
    - visQt3D-V10-07-11
    - raytracer-V10-07-04
    - vis_toolssg-V10-07-15
  
  11 November 2021  John Allison
  - visman-V10-07-28: Protect pointers in G4VisManager::GeometryHasChanged.
  
  08 November 2021 - Ben Morgan
  - Retire G4UI/G4INTY_... preprocessor symbols:
    - opengl-V10-07-24
    - openinventor-V10-07-05
    - visQt3D-V10-07-11
    - vis_toolssg-V10-07-14
    - vistree-V10-07-03
    - VRML-V10-07-03
    - visVtk-V10-07-03
  
  07 November 2021  John Allison
  - visman-V10-07-27: Introduce GetColour(const G4Visible&).
  
  05 November 2021 John Allison
  - modeling-V10-07-16: Fix bug in calculation of extent of G4PhysicalVolumeModel.
  
  05 November 2021  Guy Barrand
  - Remove G4VisPlotMessenger.hh.
    - visman-V10-07-26
    - vis_toolssg-V10-07-13
  
  03 November 2021  Guy Barrand
  - visman-V10-07-25: Improve plotting.
  - vis_toolssg-V10-07-12: Handle local list of styles.
  
  02 November 2021  Gabriele Cosmo
 - visman-V10-07-24: Fix Windows static issue in G4VVisCommand.
 
 31 October 2021 Gabriele Cosmo (vis-V10-07-14)
 - Fixed GNUmake dependencies in management and ToolsGS modules.
 
 30 October 2021  John Allison
 - visman-V10-07-23:
   - Introduce nicknames for TSG and Vtk.
   - Sort /vis/ commands in alphabetical order.
 
 30 October 2021  John Allison
 - opengl-V10-07-23: Fix G4OpenGLStoredXmViewer destructor:
 
 25 October 2021 Guy Barrand
 - modeling-V10-07-15: Introduce G4Plotter.
 - visman-V10-07-22: Introduce AddPrimitive(const G4Plotter&) and /vis/plotter/.
 - vis_toolssg-V10-07-11: More development.
 - Add "using G4VSceneHandler::AddPrimitive;" appropriately:
   - opengl-V10-07-22
   - raytracer-V10-07-04
   - vistree-V10-07-03
 
 25 October 2021 Ben Morgan (vis-V10-07-13)
 - Use G4StrUtil functions replacing deprecated G4String member functions
 
 22 October 2021  Guy Barrand
 - vis_toolssg-V10-07-10: Further development.
 
 20 October 2021  Gabriele Cosmo
 - visQt3D-V10-07-10: Fix broken dependency in GNUmakefile.
 
 18 October 2021  John Allison
 - visQt3D-V10-07-09: Introduce AddCompound(const G4Mesh&).
 
 18 October 2021 Ben Morgan (vis-V10-07-12)
 - Use std::string member functions from G4String in place of synonyms
 
 15 October 2021 John Allison
 - visVtk-V10-07-02: Implement G4VtkQt::IsUISessionCompatible.
 
 13 October 2021  Guy Barrand
 - vis_toolssg-V10-07-09: Following g4tools-V10-07-07.
 
 12 October 2021  Ben Morgan
 - vis_toolssg-V10-07-08: Xt backend does not depend on Xm.
 
 10 October 2021  John Allison  (vis-V10-07-11)
 - Coverity fixes and other minor improvements
 - modeling-V10-07-14:
   - As a result of Coverity warnings, improve the health of...
     - G4PhysicalVolumeModel:
       - Clean up tempVisAtts in case of found G4Mesh.
       - Hold current transform as object, not as a pointer.
   - G4TouchablePropertiesScene.cc:
     - Migrate to the above.
 - visman-V10-07-21:
   - G4VisCommandsCompound.cc, G4VisCommandOpen, G4VisCommandSceneHandlerCreate:
     - Improve reporting of unrecognised graphics system.
   - G4VisCommandsTouchable.cc:
     - Migrate to modeling-V10-07-14:
 - vistree-V10-07-02:
   - Migrate to modeling-V10-07-14:
 
 04 October 2021 - Stewart Boogert / Laurie Nevay (vis-V10-07-10)
 - visVtk-V10-07-01: Add VtkQt and VtkNative visualisation drivers
 
 30 September 2021  John Allison
 - raytracer-V10-07-03: Fix instantiation of G4The(MT)RayTracer.
 
 27 September 2021  Pedro Arce
 - gMocren-V10-07-02: Use G4PhantomParameterisation::GetNoVoxels.
 
 24 September 2021  John Allison
 - raytracer-V10-07-02: Make RayTracerX viewers "auto refresh".
 
 21 September 2021 Guilherme Amadio
 - opengl-V10-07-21: Fix C++20 warnings from GCC 11.2.0.
 
 06 September 2021  John Allison
 - opengl-V10-07-20: Make jpg default for OpenGL Qt viewers.
 
 02 September 2021 John Allison
 - visman-V10-07-20: Preserve view parameters of any existing viewer and
   use them in the creation of a new viewer.
 
 01 September 2021  John Allison
 - vis_toolssg-V10-07-07: Store default background in view parameters.
 
 01 September 2021  John Allison
 - visQt3D-V10-07-08: Add some protections.
 
 27 August 2021 Ben Morgan
 - visman-V10-07-19: G4VisExecutive: Remove obsolete drivers.
 - vis-HepRep-V10-07-04: Remove obsolete HepRep(WIRED) driver.
 
 26 August 2021 Ben Morgan
 - visman-V10-07-18: G4VisExecutive: Remove obsolete drivers.
 - DAWN-V10-07-02: Remove obsolete network FukuiRenderer driver.
 - VRML-V10-07-03: Remove obsolete VRML1 and network VRML2 drivers.
 
 25 August 2021  John Allison
 - VRML-V10-07-02:
   - Introduce environment variables G4VRMLFILE_HEADER and G4VRMLFILE_FILE_NAME.
 
 22 August 2021  John Allison
 - visQt3D-V10-07-07: Fix the problem of drawing from the vis sub-thread.
 
 20 August 2021  John Allison
 - visQt3D-V10-07-06: Minor updates.
 
 18 August 2021 Laurent Garnier
 - visexternals-V10-07-04: Fix issues with GL lib.
 - visexternals-V10-07-03: Fix DBL_MAX issue.
 
 09 August 2021  John Allison  (vis-V10-07-09)
 - Update vis category History file (and fix a few typos in other Histories).
 
 06 August 2021 Laurent Garnier
 - visexternals-V10-07-02: Migrate gl2ps to 1.4.2.
 
 01 August 2021  John Allison
 - opengl-V10-07-19: Fix text alignment issue on Qt.
 
 31 July 2021  John Allison
 - visman-V10-07-17: Improve warning messages.
 
 20 July 2021  John Allison
 - opengl-V10-07-18: Remove /vis/ogl/printEPS.
   o This command is covered by the more versatile /vis/ogl/export.
 
 19 July 2021  John Allison
 - opengl-V10-07-17: Use C++17 [[fallthrough]] instead of // fallthrough.
 
 18 July 2021  John Allison
 - visman-V10-07-16: Use C++17 [[fallthrough]] instead of // fallthrough.
 
 17 July 2021  John Allison
 - opengl-V10-07-16: Prepare for removing /vis/ogl/printEPS.
 
 15 July 2021  John Allison
 - visman-V10-07-15: Prepare for removing /vis/ogl/printEPS.
 - vistest-V10-07-00: Prepare for removing /vis/ogl/printEPS.
 - vistest-V10-07-00: Replace /vis/ogl/printEPS with /vis/ogl/export.
 
 13 July 2021  John Allison
 - opengl-V10-07-15: Increase the default display list limit to 10 million.
 
 12 July 2021  John Allison
 - visman-V10-07-14: Implement /vis/scene/removeModel.
 - opengl-V10-07-14: Speed up drawing - comment out glXWaitGL().
 
 09 July 2021  John Allison
 - visman-V10-07-13: Add Special Mesh Rendering parameters to /vis/viewer/save.
 
 08 July 2021  John Allison
 - opengl-V10-07-13: Improve handling of cutaways.
 
 06 July 2021  John Allison
 - modeling-V10-07-13: Fix bug in G4AxesModel name.
 - visman-V10-07-12: Miscellaneous small improvements and fixes.
 
 05 July 2021  John Allison
 - modeling-V10-07-12: Miscellaneous small improvements and fixes.
 - opengl-V10-07-12: Improve description of models for Qt scene tree.
 
 30 June 2021  John Allison  (vis-V10-07-08)
 - Requires greps-V10-07-09.
 - Revise vis models. See modeling-V10-07-11 for more details.
 - Includes:
   - modeling-V10-07-11
   - visman-V10-07-11
   - vis-HepRep-V10-07-03
   - raytracer-V10-07-01
   - vis_toolssg-V10-07-06
 - Consequent changes:
   o AddPrimitive(const G4Scale&) has been removed from all scene handlers.
   o Draw(const G4Scale&) has been removed from G4VisManager.
   o /vis/scene/add/scale reimplemented with G4CallBackModel.
   o All commands using G4CallBackModel follow interface change.
 
 29 June 2021  Gabriele Cosmo
 - vis-HepRep-V10-07-02: Fix C++20 compilation error.
 
 15 June 2021  John Allison
 - modeling-V10-07-10: Fix touchables bug.
 
 07 June 2021  John Allison (vis-V10-07-07)
 - Introduce "Special Mesh Rendering":
   o New commands: 
     /vis/viewer/set/specialMeshRendering
     /vis/viewer/set/specialMeshVolumes
   o Only available with OpenGL drivers at present.
 - Requires greps-V10-07-07:
   o New method AddCompound (const G4Mesh&).
 - modeling-V10-07-09:
   o Introduce G4Mesh, a light class that encapsulates and validates a
     nested parameterisation, which we call a "mesh". If a valid mesh
     cannot be created out of this G4VPhysicalVolume* it will
     have a type "invalid". Then, usually, it may simply be destroyed.
     The overhead of an invalid attempt is expected to be small - all the
     same it should only be invoked if the user specifies mesh rendering.
   o G4ModelingParameters: Add new data members and access functions:
   o G4PhysicalVolumeModel.cc:
     . Add code for special mesh rendering, under control of user flag. If
       flag is set by the above commands, and if a volume is a "mesh" (a
       container for a nested parameterisation), invoke new method
       AddCompound (const G4Mesh&).
 - visman-V10-07-10:
   o Implement a default AddCompound (const G4Mesh&).
     . Just draws the "container" volume and prints a G4Exception
       with guidance.
   o Add new data members to view parameters.
   o Implement the new commands:
 - opengl-V10-07-09:
   o Implement AddCompound (const G4Mesh&):
     . Turns nested parameterisations into polymarkers of dots - much
       improved speed.
 - openinventor-v10-07-04:
   o Fix hidden function warning.
   o Force kernel visit if special mesh rendering parameters change.
 - visQt3D-V10-07-05:
   o Fix hidden function warning.
   o Force kernel visit if special mesh rendering parameters change.
 - vis_toolsg-V10-07-05:
   o Force kernel visit if special mesh rendering parameters change.
 - DAWN-V10-07-01:
   o Fix hidden function warning.
 - vis-HepRep-V10-07-01:
   o Fix hidden function warning.
 - VRML-V10-07-01:
   o Fix hidden function warning.
 - gMocren-V10-07-01:
   o Fix hidden function warning.
 
 
 28 May 2021 Ben Morgan (vis-V10-07-06)
 - Migrate to modular CMake build, Incorporating
   - visexternals-V10-07-01
   - DAWN-V10-07-00
   - gMocren-V10-07-00
   - vis-HepRep-V10-07-00
   - visman-V10-07-09
   - modeling-V10-07-08
   - opengl-V10-07-08
   - openinventor-V10-07-03
   - visQt3D-V10-07-04
   - raytracer-V10-07-00
   - vis_toolsg-V10-07-04
   - vistree-V10-07-00
   - VRML-V10-07-00
 
 22 May 2021  John Allison
 - visman-V10-07-08:
   o Exploit C++17 to parse saved files in /vis/viewer/interpolate.
   o Unifies Unix and Windows code.
   o Uses <filesystem>.
 
 22 May 2021  Gabriele Cosmo (vis-V10-07-05)
 - Fixed GNUmakefile causing infinite loop.
 
 19 May 2021  John Allison  (vis-V10-07-04)
 - Remove XXX.
   o This was intended to be a "template" for new vis drivers, but it has
     become a maintenance headache. It is better to base a new vis driver
     on an existing one close to the new requirements.
 
 15 May 2021 Jonathan Madsen (vis-V10-07-03)
 - fixed cout destination for uimanager during deletion
 
 14 May 2021  Guy Barrand
 - vis_toolsg-V10-07-01: cosmetic/style improvements.
 
 14 May 2021 Frederick Jones
 - openinventor-v10-07-02:
   o Minor cleanup and tagged for MR
   o Code clean-up of OpenInventorQt classes
 
 11 May 2021  John Allison
 - visman-V10-07-07:
   o Introduce /vis/scene/add/localAxes and /vis/touchable/localAxes.
 - modeling-V10-07-05:
   o Improve G4VModel.
 
 05 May 2021  Guy Barrand
 - Introduce ToolsSG (TSG) drivers based on externals/g4tools.
 - Requires cmake-V10-07-15.
 - visman-V10-07-06: G4VisExecutive.icc:
   o Four new (mutually exclusive) vis drivers (in vis_toolsg-V10-07-00).
 - vis_toolsg-V10-07-00:
   o First committal of a tools_sg driver (Guy Barrand).
   o Four (mutually exclusive) options:
     . TOOLSSG_X11_GLES
     . TOOLSSG_WINDOWS_GLES
     . TOOLSSG_XT_GLES
     . TOOLSSG_QT_GLE
 
 20 April 2021  John Allison
 - modeling-V10-07-04:
   o G4PseudoScene::ProcessVolume: Add G4Exception.
 
 17-Apr-2021  John Allison
 - visQt3D-V10-07-02: Fix compiler warning (unused variable "text")
 
 15 April 2021  Guy Barrand
 - opengl-V10-07-07:
   o G4OpenGLWin32Viewer: fixed occasional crash with G4UIWin32 when creating
     viewer from UI command: avoid indirect call to DrawView() while still within
     CreateMainWindow().
 
 12 April 2021  John Allison
 - opengl-V10-07-06:
   o Comment out makeCurrent in ~G4OpenGLImmediate/StoredQtViewer:
   o Prevents red-button crash.
 
 08-Apr-2021  John Allison
 - visQt3D-V10-07-01: Improve debug assist.
 
 29 March 2021  John Allison
 - opengl-V10-07-05:
   o Special case for markers - use Info() if non-empty for modelShortName,
     the name that appears in Qt's scene tree. This allows the user to design
     markers, e.g., a list of points, and give them a name that relates to the
     providence of the points, e.g., a particular material or geometry component.
 
 28 March 2021  John Allison  (vis-V10-07-02)
 - modeling-V10-07-03:
   o Allow user to limit the depth of descent during a geometry tree search.
 - visman-V10-07-04:
   o /vis/scene/add/volume (and /vis/drawVolume, which calls it):
     . Exploit G4PhysicalVolumesSearchScene to streamline geometry tree searches.
     . Avoid calculating extent of a temporary physical volume when not
       necessary.
   o Add some comments of explanation in places.
 - See visualisation/management/History for an extensive explanation.
 
 26 March 2021  John Allison
 - modeling-V10-07-03:
   o Allow user to limit the depth of descent during a geometry tree search.
 
 12 March 2021  John Allison
 - modeling-V10-07-02:
   Treat opacity==0 (completely transparent) same as "invisible".
 
 11 March 2021  Gabriele Cosmo
 - opengl-V10-07-04:
   o Enable extended WIN32 window in G4OpenGLWin32Viewer.
     Based on contribution by O.Pena-Rodrigues in GitHub PR#23.
   o Removed [commented out] DrawView() implementation in G4OpenGLWin32Viewer.
 
 09 March 2021  John Allison
 - opengl-V10-07-03, visman-V10-07-03, cmake-V10-07-09:
   o Remove Wt.
 
 05 March 20201  John Allison
 - visexternals-V10-07-00:
   o gl2ps.h: Allow use of non-APPLE OpenGL on APPLE.
   o To use this, build with cpp macro GL2PS_USE_GL_GL_H.
 
 02 February 2021  John Allison
 - visman-V10-07-02:
   o Interrupt macro (vis.mac) if graphics system invalid/unavailable.
   o Issues "Batch is interrupted" and avoids long litany of further errors.
 
 30 January 2021 Frederick Jones
 - G4OpenInventorQtExaminerViewer:
   o For tabbed viewer in UIQt, added a Detach button to
     move the viewer to its own dedicated and resizable
     window on the desktop.
 
 10 January 2021  John Allison  (vis-V10-07-01)
 - Entered summaries of sub-category Histories into this category
   History file.
 
 06 January 2021 Frederick Jones
 - openinventor-v10-07-01:
   o Consolidated all the planned features of the OIQt viewer.
 
 06 January 2021  John Allison
 - opengl-V10-07-01: Remove deprecated /vis/ogl/set/ commands.
   o All commands connected with a time window. Use equivalent
     /vis/viewer/set/timeWindow commands.
   o "/vis/ogl/set/eventsDrawInterval <N> is replaced by
     "/vis/ogl/flushAt NthPrimitive <N>".
 
 02 January 2021  John Allison
 - modeling-V10-07-01: G4PhysicalVolumeModel.cc: Simplify validation.
 
 30 December 2020  John Allison
 - visman-V10-07-01: Remove deprecated G4VisManager::SetUserAction.
   o Use RegisterRunDurationUserVisAction or similar instead. These functions
     represent quite an advanced use of G4 visualisation and are rarely used.
     They have been deprecated and a warning printed since 2016.
     examples/extended/visualization were updated long ago.
 
 29-Dec-2020  John Allison
 - visQt3D-V10-07-00: Auxiliary edge suppression and some small improvements.
 
 29 December 2020  John Allison  (vis-V10-07-00)
 - modeling-V10-07-00:
   o G4VFieldModel: Change concept of choice of data points:
   o Hitherto, this model simply checked that a data point was within the
     extent. Now it uses the extent to determine the datapoint spacing.
   o Note: If fExtentForField is null, the used extent is that of the
     current scene. Otherwise it uses that supplied by the user.
 - visman-V10-07-00:
   o /vis/set/extentForField, /vis/scene/add/electricField and magneticField:
     Improve guidance to take note of change to G4VFieldModel - see
     modeling-V10-07-00 - namely that the number of data points is now
     calculated on the basis of the extent, which can be set as above.
     (If not set, the extent is null, and in G4VFieldModel, is taken to be
     the extent of the current scene.)
 
 12 December Ben Morgan
 - vis-HepRep-V10-06-00:
   o Cleanup CMake build, removing obsolete granular library option and
     explicit include_directories.
 
 07 November 2020  John Allison  (vis-V10-06-12)
 - Update this History file to include summaries of sub-category updates
 
 29 October 2020  Ben Morgan
 - OpenGL-V10-06-11: Remove inclusion of obsolete CMake module
 - visQt3D-V10-06-01: Remove inclusion of obsolete CMake module
 
 28 October 2020  Gabriele Cosmo (vis-V10-06-11)
 - Fixed GNUmakefiles in sub-modules, based on changes recently done for
   introducing use of G4RunManagerFactory and related new dependency on
   the tasking module.
 
 26 October 2020  Ben Morgan    (vis-V10-06-10)
 - Only enable Qt3D when GEANT4_USE_QT3D is true
 
 26-Oct-2020  Gabriele Cosmo
 - visQt3D-V10-06-01: Corrected GNUmake setup and fixed compilation warnings.
 
 23 October 2020  John Allison  (vis-V10-06-09)
 - Introduce Qt3D vis driver.
   o visQt3D-V10-06-00: First version.
   o Requires cmake-V10-06-34.
 
 21 October 2020  Jonathan Madsen
 - visman-V10-06-11: Implemented G4RunManagerFactory::GetMasterRunManager()
 
 21 October 2020  John Allison
 - visman-V10-06-10: Improve logic of automatic event keeping.
 
 20 October 2020  Jonathan Madsen
 - modeling-V10-06-05: Implemented G4RunManagerFactory::GetMasterRunManager()
 - OpenGL-V10-06-10: Implemented G4RunManagerFactory::GetMasterRunManager()
 - raytracer-V10-06-03: Implemented G4RunManagerFactory::GetMasterRunManager()
 
 20 October 2020 Frederick Jones
 - openinventor-v10-06-11:
   o Completed all the planned features of the OIQt viewer.
 
 15 October 2020  John Allison  (vis-V10-06-08)
 - visman-V10-06-09:
   o Use command->CommandFailed() - remove internal fErrorCode.
 
 2 October 2020  John Allison
 - DAWN-V10-06-03:
   o Fix "overlapping comparisons always evaluate to true".
 
 23 September 2020 Ben Morgan
 - visxxx-V10-06-00
   o Remove no longer required include_directories
 
 18 September 2020  John Allison  (vis-V10-06-07)
 - modeling-V10-06-04:
   o Pick up default vis attributes.
   o Improve printing.
 - OpenGL-V10-06-09:
   openinventor-V10-06-10:
   visXXX-V10-05-05:
   o CompareForKernelVisit; Force kernel visit if global parameters change.
     . GlobalMarkerScale and GlobalLineWidthScale.
   o Move fLastVP=fVP so always updated (avoids unnecessary redraw at start)
 
 10 August 2020  John Allison  (vis-V10-06-06)
 - visman-V10-06-08:
   o Remove obsolete G4VIS_USE_STD11 and references to obsolete G4VIS_USE.
 - raytracer-V10-06-02:
   o Suppress printing during RayTracer run.
 
 4 August 2020  John Allison  (vis-V10-06-05)
 - modeling-V10-06-03:
   o Rationalise defaults for PVPaths - make sure all nodes are marked as
     "not drawn" unless actually chosen for drawing.
 - visman-V10-06-07: Introduce extra protections in NotifyHandlers.
 
 3 July 2020  John Allison
 - VRML-V10-06-02, DAWN-V10-06-02:
   o Fix Unbuntu 20 compiler warning about ignoring return value
     of ‘int system(const char*)’.
 
 01 July 2020  John Allison
 - visexternals-V10-06-01: gl2ps.cc: Fix Coverity warning.
 
 19 June 2020  John Allison
 - opengl-V10-06-07: Fix Qt 5.15 deprecation warnings.
 
 18 June 2020  John Allison  (vis-V10-06-04)
 * visman-V10-06-06: /vis/scene/add/*Field: Correct guidance (red->green->blue).
 * visXXX-V10-05-04: Fix a debug statement.
 * From earlier:
   * DAWN-V10-06-01: Compatibility between old and new CMake systems.
   * opengl-V10-06-06: Automatically generate and compile Moc sources.
   * opengl-V10-06-05: Remove Qt4 support.
   * openinventor-V10-06-07: Automatically generate and compile Moc sources.
   * openinventor-V10-06-06: Corrected GNUmakefile.
   * openinventor-V10-06-05: Corrections to OIQt viewer.
   * openinventor-V10-06-04: Fix compilation warnings.
   * openinventor-V10-06-03: sources.cmake: Configuration for OIQt driver.
   * openinventor-V10-06-02: Remove Qt4 support.
   * openinventor-V10-06-01: Fix Bugzilla 2215.
   * raytracer-V10-06-01: Compatibility between old and new CMake systems.
   * VRML-V10-06-01: Compatibility between old and new CMake systems.
   * gMocren-V10-06-01: Fix for clang10.
 
 19 May 2020 John Allison
 * visman-V10-06-05: Very minor improvements.
 
 5 May 2020  Gunter Folger
 - gMocren-V10-06-01:
   o Fix for clang10: for for warning on confusing indentation
 
 22 April 2020 Frederick Jones
 * visman-V10-06-04: Support fro OIQt driver.
 
 07 April 2020. John Allison
 * modeling-V10-06-02: Minor tidy.
 * visman-V10-06-03:
   * Bug fix: Models with no extent do not contribute to scene's extent.
   * /vis/sceneHandler/create:
     * Trap infinite loop when looking for a fallback graphics system.
 
 04 March 2020. John Allison  (vis-V10-06-03)
 * greps-V10-06-03: Improve deprecation message.
 * modeling-V10-06-01:
   * Suppress warnings while filter not fully established.
 * visman-V10-06-02:
   * Bug fix: Rebuild graphics databases after /vis/filtering/*/mode.
   * Improve printing of available systems and models.
 * G4VisCommandsListManager.hh:
   * Notify handlers after /vis/filtering/*/mode command.
     * Causes rebuild of graphics database.
 * G4VisManager.cc: Improve printing of available systems and models.
 * opengl-V10-06-04: Fix bug in /vis/ogl/export when dot in name.
 
 13 February 2020. John Allison  (vis-V10-06-02)
 - visman-V10-06-01: New command: /vis/geometry/set/forceCloud.
 - opengl-V10-06-03: Improve guidance and tidy /vis/ogl/ commands.
 
 12 December 2019 B. Morgan (vis-V10-06-01)
 - DAWN-V10-06-00, gMocren-V10-06-00, VRML-V10-06-00, vis-HepRep-V10-06-00,
   visman-V10-06-00, modeling-V10-06-00, openinventor-V10-06-00, raytracer-V10-06-00,
   vistree-V10-06-00, opengl-V10-06-01
 - Cleanup CMake build, removing obsolete granular library option and
   explicit include_directories.
 
 12 December 2019 Ben Morgan (vis-V10-06-00)
 - visexternalgl2ps-V10-06-00, opengl-V10-06-00
   - Remove no longer required dependence on OpenGLU
 
 04 November 2019  John Allison  (vis-V10-05-26)
 - opengl-V10-05-11: Extend glFlush scaling to all circumstances.
 - visman-V10-05-14: G4VisCommandsViewer.cc (Gabriele Cosmo):
   o Replaced use of std::experimental::filesystem with std::filesystem
     for WIN32 target. Forcing c++17 default builds on Windows and allow for
     porting on Visual Studio 2019.
 
 22 October 2019  Gabriele Cosmo
 - opengl-V10-05-10:
   o Rationalise headers inclusion in G4OpenGLQtViewer.cc.
 
 20 September 2019  John Allison  (vis-V10-05-25)
 - visman-V10-05-13: Several small improvements and fixes.
 - opengl-V10-05-09 (Laurent Garnier): Remove default font size.
 
 19 September 2019  Makoto Asai
 - visman-V10-05-12: G4VSceneHandler.cc:
   o Namespace scope is added to MeshScoreMap
   o Co-working with detutils-V10-05-01
 
 17 September 2019 Laurent Garnier
 - visexternalgl2ps-V10-05-02:
   o gl2ps.cc: fix Continous warnings
 - visexternalgl2ps-V10-05-01:
   o gl2ps.cc gl2ps.h: Update library to 1.4.0 applying Geant4 patches
 
 29 August 2019  John Allison  (vis-V10-05-24)
 - Part of greps-V10-05-04.
 - visman-V10-05-11, DAWN-V10-05-00, gMocren-V10-05-01, VRML-V10-05-00,
   vis-HepRep-V10-05-00, visXXX-V10-05-03, modeling-V10-05-08:
   o Add G4TessellatedSolid to list of solids that may be specially treated
 
 22 August 2019  John Allison  (vis-V10-05-23)
 - visman-V10-05-10:
   o Rework /vis/scene/add/eventID:
     . Just writes a summary at end of run.
     . Except when reviewing kept events one by one, in which case it
       writes run and event no for each event.
   o Ensure /vis/drawTree works even if vis is disabled.
 
 17 August 2019  John Allison
 - visman-V10-05-09:
   o Clear if scene contains no run duration models.
     . E.g., after geometry has changed.
 
 16 July 2019  John Allison  (vis-V10-05-22)
 - modeling-V10-05-07:
   o G4CallbackModel: Include modeling parameters in passed arguments.
 - visman-V10-05-08:
   o Follow changes in modeling-V10-05-07.
   o Augment G4VUserVisAction to give access to:
     G4VGraphicsScene* fpSceneHandler;
     const G4Transform3D* fpTransform;
     const G4ModelingParameters* fpMP;
 - opengl-V10-05-08:
   o Revert fix in OpenGL-V10-05-05. The fix in OpenGL-V10-05-07 is better.
 
 
 06 July 2019  John Allison  (vis-V10-05-21)
 - modeling-V10-05-06: Fix setLineVisible in /vis/modeling.
 - visman-V10-05-07: Fix bug in cloud drawing.
 - OpenGL-V10-05-07: Improve X window opening (Guy Barrand).
 - vistree-V10-05-01: Fix typo in output message.
 
 13 June 2019  John Allison  (vis-V10-05-20)
 - modeling-V10-05-04: Add cloud parameters.
 - visman-V10-05-06: Final changes for introduction of cloud drawing.
 - OpenGL-V10-05-06: Final changes for introduction of cloud drawing.
 - visXXX-V10-05-02: Final changes for introduction of cloud drawing.
 - openinventor-V10-05-05: Test number of cloud points for kernel visit.
 
 10 June 2019  John Allison  (vis-V10-05-19)
 - modeling-V10-05-03:
   o Arrows and field models: Introduce further protection.
 - OpenGL-V10-05-05:
   o Force double buffer context for OGLIX.
   o Force kernel visit on change of number of cloud points.
 - openinventor-V10-05-04:
   o Add missing #ifdef G4VIS_BUILD_OIX_DRIVER.
 - visXXX-V10-05-01:
   o Force kernel visit on change of number of cloud points
 
 30 May 2019  John Allison  (vis-V10-05-18)
 - modeling-V10-05-02: Improve field modelling.
 - visman-V10-05-05: Improve message.
 
 04 April 2019  John Allison  (vis-V10-05-17)
 - Co-working tags visman-V10-05-04 and modeling-V10-05-01.
   o Final (for now) corrections to /vis/viewer/set/sectionPlane.
     Still some strange behaviour in small fraction of cases. See
     comments in G4PhysicalVolumeModel::DescribeSolid around line 748.
 
 29 March 2019  John Allison
 - opengl-V10-05-04: Fix Coverity warning and bug in section plane.
 - visman-V10-05-03: Minor tidying.
 
 24 March 2019  John Allison  (vis-V10-05-16)
 - modeling-V10-05-00, visman-V10-05-02, opengl-V10-05-03:
   o Fix bug in /vis/viewer/set/sectionPlane.
 
 18 March 2019  Gabriele Cosmo (vis-V10-05-15)
 - Corrected few typos in printout/comments.
 
 10 February 2019  John Allison (vis-V10-05-14)
 - visman-V10-05-00:  Introduce cloud drawing style
   New parameter candidate in /vis/viewer/set/style:
     /vis/viewer/set/style cloud
   Cloud drawing uses solid->GetPointOnSurface, i.e., it uses kernel
   algorithms and by-passes polyhedral representations. The solid is
   represented by a polymarker of dots. The default number of points
   is 1000. This can be changed with
     /vis/viewer/set/numberOfCloudPoints
   (The minimum number is 100.)
   Note that OpenGL has a fast algorithm for polymarker.
 - This allows us to use cloud style both as a choice or as fallback when the
   polyhedral representation fails, for example, when BooleanProcessor fails.
 - See management/History for details.
 - opengl-V10-05-00 and opengl-V10-05-01:
   o Avoid re-using display lists for markers. They may have their own
     position relative to the overall object transformation.
 
 24 February 2019  John Allison (vis-V10-05-13)
 - Remove Get/SetDrawOverlapsFlag from G4VVisManager.
 - Fix bug in overlap drawing of parameterised volumes.
 - Add /vis/touchable/extentForField and volumeForField.
 
 19 February 2019  John Allison (vis-V10-05-12)
 - In graphics reps (see graphics_reps/History for details):
   o Implemented G4VisExtent::Transform(const G4Transform3D&).
 - In modeling (see modeling/History for details):
   o Introduced G4BoundingExtentScene. This allows one to accumulate extents
     using the newly introduced G4VisExtent::Transform and is a better way
     of determining the overall extent of a scene (or of any set of extents)
     than by the bounding sphere approach.
   o G4VFieldModel, G4ElectricFieldModel, G4MagneticFieldModel:
     . Introduced volume for field.
   o G4VModel: Introduced GetTransformedExtent.
   o G4PhysicalVolumeModel:
     . Use G4BoundingExtentScene instead of G4BoundingSphereScene.
     . Fix bug whereby the local extent was incorrectly calculated - in fact
       it was the transformed extent.
 - In management (see management/History for details):
   o Add /vis/scene/showExtents.
   o Add /vis/set/volumeForField.
   o Add /vis/touchable/showExtent.
   o Add copy number parameter to /vis/touchable/findPath.
   o Correct for fix to bug in G4PhysicalVolumeModel - see modeling/History.
 
 13 February 2019  John Allison (vis-V10-05-11)
 - Implement /vis/set/extentForField
   o The default is a null extent, which is to be interpreted by the field
     model as the whole extent of the current scene. Otherwise, with this
     command, you can limit the extent over which the field is drawn. This
     would help, for example, if drawing over the whole scene produced so
     many arrows or lines that it clutters the scene.
   o Changed the default spacing - the parameter nDataPointsPerHalfExtent
     is changed from 10 to 3 - so as not to clutter the scene. See
     guidance of /vis/scene/add/*Field commands for further explanation.
 
 10 February 2019  John Allison (vis-V10-05-10)
 - See manegement/History for details.
 - New and improved commands:
   o /vis/viewer/centreOn: Improved - it does not zoom.
   o /vis/viewer/centreAndZoomInOn: New.
   o /vis/touchable/centreOn: Improved - it does not zoom.
   o /vis/touchable/centreAndZoomInOn: New.
 
 08 February 2019  John Allison (vis-V10-05-09)
 - Fix Coverity warnings.
 
 03 February 2019  Michael Kelsey (vis-V10-05-08)
 - See modeling/History and management/History for details.
   o Add /vis/scene/add/electricField by analogy to existing .../magneticField.
   o Refactor MagneticFieldModel class with new base to handle all kinds of
     vector fields; existing, and new ElectricFieldModel only have to
     implement a simple function to get the field vector at a location.
 
 31 January 2019  Ivana Hrivnacova (vis-V10-05-07)
 - Merged GitHub PR #4: all Boolean operators now return G4bool.
 
 29 January 2019  John Allison  (vis-V10-05-06)
 - See modeling/History and management/History for details.
 - Add /vis/touchable/draw.
 - /vis/viewer/centreOn: Add copy number to parameter list.
 - Several fixes to handle paramaterisations and replicas.
 
 26 January 2019  John Allison
 - Fix calculation of vis extent for parameterisations. See
   modeling/History and management/History for details.
 
 25 January 2019  John Allison
 - Rationalise view interpolation
   Encapsulate algorithm into base class G4VVisCommand. The commands
     /vis/viewer/interpolate
     /vis/viewer/centreOn
     /vis/touchable/centerOn
   now use this. Might consider use by all view changing commands.
 
 25 January 2019  John Allison  (vis-V10-05-05)
 - Include parameterised volumes in overlap checking and visualisation
   in G4LogicalVolumeModel
 
 22 January 2019  John Allison  (vis-V10-05-04)
 - Introduce /vis/viewer/centreOn and /vis/touchable/centreOn
   This allows one to centre the view (zoom in) on a volume.
   Reset with /vis/viewer/reset.
 
 21 January 2019  John Allison  (vis-V10-05-03)
 - Pick up default number of line-segments-per-circle from G4Polyhedron.
 
 08 January 2019  John Allison  (vis-V10-05-02)
 - Correct History files after merge.
 
 02 January 2019  John Allison  (vis-V10-05-01)
 - Minor improvements to vis manager - see management/History for details.
 
 02 January 2019  John Allison  (vis-V10-05-00)
 - Improve volume handling.
   o modeling: Add volume count (but comment out printing).
   o management: Improve guidance for /vis/scene/add/volume.
 
 14 November 2018  John Allison  (vis-V10-04-25)
 - modeling-V10-04-18: Fix Coverity warning.
 
 14 November 2018  John Allison  (vis-V10-04-24)
 - visman-V10-04-28: /vis/scene/add/userAction, /vis/drawLogicalVolume:
   o Minor bug fixes.
 
 09 November 2018  Gabriele Cosmo
 - raytracer-V10-04-04: G4RTMessenger: fixed printout typos.
 
 08 November 2018  John Allison  (vis-V10-04-23)
 - modeling-V10-04-17: G4LogicalVolumeModel.cc:
   o Overlap checking now in text and drawing.
 - visman-V10-04-26: /vis/scene/add/logicalVolume:
   o Overlap checking now in text and drawing.
 
 07 November 2018  John Allison  (vis-V10-04-22)
 - modeling-V10-04-16:
   o Overlap checking only in text output at present.
 - visman-V10-04-25: /vis/scene/add/logicalVolume:
   o Overlap checking only in text output at present.
 
 24 October 2018  John Allison  (vis-V10-04-21)
 - modeling-V10-04-15: Extensive revision of handling of touchables.
 - visman-V10-04-24:
   o Conform to modeling-V10-04-15.
   o Add /vis/touchable/findPath.
   o Improve several other facilities for accessing touchables.
 - raytracer-V10-04-03: Conform to modeling-V10-04-15.
 
 19 October 2018  John Allison
 - Requires greps-V10-04-08.
 - visman-V10-04-23: Simplify scene checking and fix minor bug.
 
 17 October 2018  John Allison  (vis-V10-04-20)
 - modeling-V10-04-14: Attempt fix for Windows compiler error.
 - visman-V10-04-22:
   /vis/scene/add/volume (and, consequently, /vis/drawVolume):
   Improve guidance: Describe the use of a regular expression.
   If physical-volume-name is "world" (the default), the top of the
   main geometry tree (material world) is added.  If "worlds", the
   top of all worlds - material world and parallel worlds, if any - are
   added.  Otherwise a search of all worlds is made.
   In the last case (a search of all worlds) all physical volume names are
   matched against the first argument of this command.  If this is of the
   form "/regexp/", where regexp is a regular expression (see C++ regex),
   the physical volume name is matched against regexp by the usual rules
   of regular expression matching. Otherwise an exact match is required.
   For example, "/Shap/" matches "Shape1" and "Shape2".
 
 15 October 2018  John Allison  (vis-V10-04-19)
 - Requires greps-V10-04-07.
 - modeling-V10-04-13: Add regex search.
   o Match the string with the required match. The latter can be of the form
     "/regexp/", where regexp is a regular expression (see C++ regex),
     or a plain string, in which case there must be an exact match.
 - visman-V10-04-21: Tidy.
 
 8 October 2018  John Allison  (vis-V10-04-17)
 - visman-V10-04-20: Fix bug in visman-V10-04-19.
 
 6 October 2018  John Allison  (vis-V10-04-16)
 - modeling-V10-04-12: Improve description of G4TrajectoriesModel.
 - visman-V10-04-19:
   o G4VisManager.cc: Move creation of top level commands to end so that
     they may pick up guidance and parameters from invoked commands.
   o /vis/drawVolume and /vis/draw/logicalVolume:
     . Pick up guidance and parameters from /vis/scene/add/...
   o /vis/scene/add/trajectories: avoid adding new model if one exists.
     . If no trajectories model exists in the scene create a new one...
       ...else it already exists and there is no need to add a new one
       because G4TrajectoriesModel simply describes trajectories in the
       trajectories store whatever the type.
 
 5 October 2018  John Allison  (vis-V10-04-15)
 - opengl-V10-04-10: Open header files to users. In all header files, change
 #ifdef G4VIS_BUILD_OPENGL_DRIVER
   to
 #if defined (G4VIS_BUILD_OPENGL_DRIVER) || defined (G4VIS_USE_OPENGL)
   and similarly for OPENGLX, XM, QT, WT and WIN32. This is so that a user
   may include the OpenGL headers and use the OpenGL library. This will be
   useful if a user (or a developer) wishes to write a new vis driver
   based on the existing OpenGL code.
 
 11 September 2018  John Allison
 - modeling-V10-04-11: Initialise line width.
 - opengl-V10-04-09: Fix shadowing of variable in namespace CLHEP.
 
 10 September 2018  John Allison  (vis-V10-04-14)
 - modeling-V10-04-10 and visman-V10-04-18:
   o /vis/drawVolume and /vis/scene/add/volume now draw ALL occurrences of
     a physical volume.
 
 3 September 2018  John Allison
 - modeling-V10-04-09: G4PhysicalVolumeSearchScene:Tidy.
 
 31 August 2018  John Allison
 - modeling-V10-04-08: Add setLineWidth for trajectory models.
 
 29 August 2018  John Allison  (vis-V10-04-13)
 - modeling-V10-04-07:
   o G4LogicalVolumeModel:
     . Add overlap checking (printing only for now).
     . Avoid multiple printing of overlaps. Print only first time for
       a given instantiation of G4LogicalVolume.
   o Add G4TouchableGlobalTransformScene:
     . Return a pointer to the global transform of a touchable.
   o Add G4TouchableUtils:
     . Implement G4TouchableUtils::FindGlobalTransform. (Uses
       G4TouchableGlobalTransformScene.) Typical use:
         G4ModelingParameters::PVNameCopyNoPath path;
         // Specify the complete path of the touchable by a succession of
         // name,copyNo pairs or pointer,copyNo pairs.
         path.push_back(G4ModelingParameters::PVNameCopyNo("World",0));
         path.push_back(G4ModelingParameters::PVNameCopyNo("Envelope",0));
         .. etc., until touchable completely specified
         const G4Transform3D* pGlobalTransform =
         G4TouchableUtils::FindGlobalTransform(path);
 - visman-V10-04-17:
   o Fix bug for multiple worlds in /vis/touchable/dump.
 
 20 August 2018  John Allison  (vis-V10-04-12)
 - openinventor-V10-04-07: Fix spelling mistake.
 
 20 August 2018  Frederick Jones and John Allison  (vis-V10-04-11)
 - openinventor-V10-04-06: Minor bug fixes.
 
 14 August 2018  John Allison
 - visman-V10-04-16: Reinstate G4VViewer::G4Spline.
 
 12 August 2018  John Allison  (vis-V10-04-10)
 - opengl-V10-04-08: Small bug fixes, including light front.
 - visman-V10-04-15: Small bug fix in G4ViewParameters operator<<.
 
 11 August 2018  John Allison  (vis-V10-04-09)
 - opengl-V10-04-07:
   o Disable GL_LIGHTING for 3D markers.
 - openinventor-V10-04-05:
   o Consolidate Fred's work. Add to sources.cmake.
 - visman-V10-04-14:
   o Remove G4VViewer::G4Spline.
   o /vis/viewer/set/timeWindow/displayLightFront: change defaults.
   o /vis/viewer/colourByDensity: change defaults.
 
 24 July 2018  John Allison  (vis-V10-04-08)
 - visman-V10-04-13:
   o /vis/viewer/interpolate: Fix gcc-8 warnings.
   o /vis/viewer/colourByDensity: Change defaults:
     . Algorithm 1 is default.
     . gm/cm3 is default unit.
     . Subsequent parameters are not omitable.
 
 13 July 2018  Gabriele Cosmo
 - gMocren-V10-04-01: Fixed remaining gcc-8 compilation warnings.
 
 15 June 2018  Fred Jones
 - openinventor-V10-04-03: Fix gcc8.1 warnings for casts.
 
 11 June 2018  John Allison
 - modeling-V10-04-06: Fix Coverity warning.
 
 05 June 2018  John Allison  (vis-V10-04-07)
 - openinventor-V10-04-02: Fix compilation error.
 - raytracer-V10-04-01: Update "thread-local-static-var" model.
 - visexternals-V10-04-01: Corrected GNUmakefile.
 
 26 May 2018  John Allison  (vis-V10-04-06)
 - visexternals-V10-04-00, visexternalgl2ps-V10-04-00,
   VRML-V10-04-00, gMocren-V10-04-00, DAWN-V10-04-00:
   o Fix gcc-8 warnings.
 
 25 May 2018  John Allison
 - visman-V10-04-11: Introduce /vis/drawLogicalVolume:
   o Synonymous with /vis/specify.
   o Both commands create a new scene and invoke /vis/scene/add/logicalVolume.
 
 24 May 2018  John Allison  (vis-V10-04-05)
 - modeling-V10-04-05:
   o G4LogicalVolumeModel: Add overlap checking,
   o Fix gcc-8 warnings.
 - visman-V10-04-10:
   o /vis/specify, /vis/scene/add/logicalVolume: Include overlap checking.
 - opengl-V10-04-06:
   o Fix gcc-8 warnings.
 
 08 May 2018 Ben Morgan
 - visman-V10-04-09: Explicitly #include G4Types header.
 
 26 April 2018  John Allison
 - openinventor-V10-04-01: Fix compilation errors.
 
 25 April 2018  John Allison  (vis-V10-04-04)
 - visXXX-V10-04-00, openinventor-V10-04-00, opengl-V10-04-05:
   o Implement kernel visit for "colour by density".
 - visman-V10-04-08:
   o Complete development for /vis/viewer/colourByDensity:
     . Copy colour-by-density parameters from view parameters to
       modeling parameters.
     . Colour volumes according to density if the user has not specified
       vis attributes. Useful for drawing geometry from GDML.
 
 24 April 2018  John Allison
 - modeling-V10-04-04: Small bug fix.
 - modeling-V10-04-03: Implement /vis/viewer/colourByDensity.
 - visman-V10-04-07: Small bug fix.
 - visman-V10-04-06, opengl-V10-04-04:
   o Migrate to greps-V10-04-04.
 
 23 April 2018  John Allison
 - visman-V10-04-05:
   o Migrate to greps-V10-04-03.
   o Complete implementation of /vis/viewer/colourByDensity.
 
 22 April 2018  John Allison
 - visman-V10-04-04: Several small cosmetic improvements.
 
 28th March 2018  John Allison  (vis-V10-04-03)
 - visman-V10-04-03: Improve some vis commands.
 
 20th March 2018  Makoto Asai
 - raytracer-V10-04-00:
   o Use HyperStep of G4ParallelWorldProcess to draw volumes
     defined in a parallel world.
 
 11th March 2018  John Allison  (vis-V10-04-02)
 - modeling-V10-04-02: Fix bug calculating mass of parallel world.
 - visman-V10-04-02: Improve comments.
 - vistree-V10-04-00:
   o Fix bug in suppressed writing of repeated parameterised volumes.
 
 13 February 2018 Jonathan Madsen
 - opengl-V10-04-03:
   o Replaced explicit usage of G4Mutex locking/unlocking with
     G4AutoLock pointers initialized with std::defer_lock as this
     enables one to avoid any deadlock or non-locked condition_variable
     waits by using G4AutoLock::owns_mutex()
 
 12 February 2018 Jonathan Madsen
 - opengl-V10-04-02:
   o Updated G4CONDITIONWAIT(...) to new C++11 requirements
   o Found probable bug in G4OpenGLQtViewer with condition wait -- not locked
     prior to entering condition, which is an undefined behavior. Adapted
     G4AutoLock to accept std::defer_lock_t (doesn't lock upon construction)
     to prevent deadlock that occurs when the mutex is locked
 
 31st January 2017  John Allison  (vis-V10-04-01)
 - Tidy History files.
 
 8th January 2017  John Allison  (vis-V10-04-00)
 - Merged timemovebranch: visman-V10-04-01, opengl-V10-04-01:
   o Moved time window parameters from G4OpenGLStoredViewer to
     G4ViewParameters. Now one can interpolate time window parameters (using
     /vis/viewer/interpolate) and make a movie of particles moving through time.
   o To do this, see guidance on /vis/viewer/set/timeWindow/ commands. Briefly:
       /vis/scene/add/trajectories rich
       /vis/modeling/trajectories/drawByCharge-0/default/setTimeSliceInterval 0.01 ns
     then typically
       /vis/viewer/set/timeWindow/displayLightFront true 0 0 -50 cm -0.5 ns
       /vis/viewer/set/timeWindow/displayHeadTime true
       /vis/viewer/set/timeWindow/fadeFactor 1
       /run/beamOn # or several until you get a good event or events
       /vis/viewer/set/timeWindow/startTime 0 ns 1 ns
       /vis/viewer/save
       /vis/viewer/set/timeWindow/startTime 1 ns 1 ns
     then zoom, pan etc to a view of interest and
       /vis/viewer/save
     then repeat with next start time, another view and a save, then try
       /vis/viewer/interpolate
 
 3rd January 2017  John Allison  (timemovebranch-09)
 - G4ViewParameters:: TimeWindowCommands: Fix for /vis/viewer/save.
 
 2nd January 2017  John Allison  (timemovebranch-08)
 - Moved time window commands to /vis/viewer/set/timeWindow/.
 - DEPRECATED the equivalent /vis/ogl/set/ commands.
 
 2nd January 2017  John Allison  (timemovebranch-07)
 - Copied /vis/ogl/set time window commands to /vis/viewer/set.
 
 1st January 2017  John Allison  (timemovebranch-06)
 - G4ViewParameters: Completed PrintDifferences, operator<< and operator!= for
   time window parameters.
 
 31st December 2017  John Allison  (timemovebranch-05)
 - G4ViewParameters: Provide proper Get and Set functions for time parameters.
 
 31st December 2017  John Allison  (timemovebranch-04)
 - Implement G4OpenGLStoredViewer::AddPrimitiveForASingleFrame.
 
 19th December 2017  Gabriele Cosmo
 - modeling-V10-04-01:
   o Fixed self-consistency in G4AttValueFilterT header (missing #include).
     Thanks to Raphael Isemann for reporting this.
 
 14th December 2017  John Allison  (timemovebranch-03)
 - Merged changes from trunk up to -r107990.
 
 14th December 2017  John Allison  (timemovebranch-02)
 - Time move: Tested light front drawing. Some small changes required.
 
 14th December 2017  John Allison  (timemovebranch-01)
 - Time move: First working version. Much tidying to do.
 
 14th December 2017  John Allison
 - opengl-V10-04-00: Fix display list memory being exceeded.
 
 13th December 2017  John Allison  (timemovebranch-00)
 - Move start time etc. from G4OpenGLViewer to G4Viewparameters:
   o First stage (data are public members of G4Viewparameters).
 
 12th December 2017  John Allison
 - visman-V10-04-00: Minor cosmetic.
 - modeling-V10-04-00: Improve an informational message.
 
 7th November 2017  John Allison (vis-V10-03-10)
 - opengl-V10-03-04: Refine content of output of picking.
 
 29th October 2017  John Allison
 - visman-V10-03-16: Protect /vis/enable issued before run established.
 
 6th October 2017  John Allison (vis-V10-03-09)
 - Needs greps-V10-03-07.
 - visman-V10-03-15:
   o Improve end of run printing when /vis/disable.
   o Initialise G4Colour colour map.
 
 14th September 2017  John Allison
 - vis-HepRep-V10-03-01: Fix Coverity warning.
 
 13th September 2017  John Allison (vis-V10-03-08)
 - modeling-V10-03-08 and visman-V10-03-14:
   Reverted default number of line segments per circle to 24.
   (72 lines per circle gives trouble in the Boolean Processor, so until that
   is fixed we revert to 24.)
 
 1st September 2017  Laurent Garnier (vis-V10-03-07)
 - opengl-V10-03-03: Add patch affecting repaint for external applications. See bugzilla #1959.
 
 21st June 2017  John Allison (vis-V10-03-06)
 - visman-V10-03-13: Implement /vis/drawOnlyKeptEvents.
   To draw selected events the user should set this flag, then in a user action:
     if ( some criterion ) {
       G4EventManager::GetEventManager()->KeepTheCurrentEvent();
     }
 
 23rd May 2017  John Allison
 - VRML-V10-03-01: Fixes for gcc-7.1 warnings.
 - gMocren-V10-03-00: Fixes for gcc-7.1 warnings.
 - vis-HepRep-V10-03-00: Fixes for gcc-7.1 warnings.
 - opengl-V10-03-02: Hopefully fix gcc-7.1 warnings.
 - visexternal-V10-03-00: Fix gcc-7.1 warning.
 
 14th May 2017  John Allison
 - modeling-V10-03-07: G4GPSModel: Added user-selectable colour.
 - visman-V10-03-12: Add user-selected colour to /vis/scene/add/gps.
 
 12th May 2017  John Allison
 - visman-V10-03-11:
   o Improved guidance.
   o /vis/viewer/save: Add .g4view if an extension us not supplied by the user.
   o /vis/viewer/set/defaultTextColour: Changed default to blue and opaque to
   agree with default text vis attributes.
 
 11th May 2017  John Allison
 - visman-V10-03-10: Fixed Windows compilation isse.
 
 10th May 2017  John Allison
 - visman-V10-03-09: Needs greps-V10-03-04. Added G4VVisCommand::ConvertToColour.
 
 7th May 2017  John Allison (vis-V10-03-05)
 - visman-V10-03-08: Fix /vis/viewer/interpolate for file writing viewers.
 - DAWN-V10-03-00:
   o Expand filename numbering to 4 digits, e.g., g4_0000.prim, g4_0001.prim,...
   o You may need
     export G4DAWNFILE_MAX_FILE_NUM=9999
     or setenv G4DAWNFILE_MAX_FILE_NUM 9999
   o Useful if producing many files for a movie.
 - raytracer-V10-03-04:
   o Expand filename numbering to 4 digits, zero filled, e.g.,
       g4RayTracer.viewer-1_0000.jpeg
       g4RayTracer.viewer-1_0001.jpeg
     etc.
   o Useful for producing many files for a movie.
 
 3rd May 2017  John Allison
 - modeling-V10-03-06 (needs event-V10-03-01):
   o Completed G4GPSModel for visualisation of General Particle Source. Can
     be used with command /vis/scene/add/gps.
 
 3rd May 2017  John Allison (vis-V10-03-04)
 - modeling-V10-03-05:
   o Add prototype/skeleton G4GPSModel.
   o Improve checking of G4PhysicalVolumeModel.
 
 1st May 2017  John Allison
 - visman-V10-03-07: Added /vis/scene/add/gps.
 
 23rd April 2017  John Allison
 - visman-V10-03-05: Improved command guidance.
 
 19th April 2017  John Allison
 - modeling-V10-03-01: Added G4ModelingParameters::PVPointerCopyNo.
 - raytracer-V10-03-02:
   o Changed back to XA_RGB_BEST_MAP (seems OK now).
   o Simplified passing of ray tracer pointer.
   o Fixed a bug whereby the jpeg for RayTracer was always 600x600.
 
 18th April 2017  John Allison
 - visman-V10-03-04: Improved error trapping.
 
 22nd February 2017  John Allison
 - raytracer-V10-03-00:
   G4RTXScanner.cc: Changed XA_RGB_BEST_MAP to XA_RGB_DEFAULT_MAP.
   (It seems XA_RGB_BEST_MAP no longer available on Mac XQuartz 2.7.11.)
 - visman-V10-03-03: Replaced G4VisExtent::NullExtent by G4VisExtent().
 
 12th January 2017  John Allison
 - opengl-V10-03-01: Tidied.
 - visman-V10-03-02: Brian Smith, Laurent Garnier:
   o /vis/viewer/interpolate: Now works for WIN32.
 
 12th January 2017  John Allison  (vis-V10-03-01)
 - Tagged.
 
 10th January 2017  Fred Jones
 - openinventor-V10-03-00:
   o G4OpenInventorXtExtendedViewer: fixes and improvements.
 
 7th December 2016  John Allison
 - visman-V10-03-01:
   o Deprecated SetUserAction. Use RegisterRunDurationUserVisAction."
 
 6th January 2017  John Allison
 - opengl-V10-03-00: Fixed bug in ScaledFlush.
 
 9th December 2016  John Allison  (vis-V10-03-00)
 - modeling-V10-03-00 and visman-V10-03-00:
   o Improved arrow drawing.  Reduced default lineSegmentsPerCircle
     to 6 for rapid yet adequate drawing.
   o Similar improvement to magnetic field drawing.
   o Default can be changed with new command:
     /vis/set/arrow3DLineSegmentsPerCircle.
 
 27th November 2016  John Allison
 - visman-V10-02-37: Fix for OpenGLXm.
 
 21th November 2016  Laurent Garnier (vis-V10-02-30)
 - opengl-V10-02-26: Go back on the glCheckFramebufferStatus(): comment out this command
 
 21th November 2016  Laurent Garnier (vis-V10-02-29)
 - opengl-V10-02-25 :Fix the glCheckFramebufferStatus() :
 
 20th November 2016  John Allison
 - opengl-V10-02-24: Safer fix to colour problem with transparent
   volumes in DrawDisplayLists (DEV-261). Fixes the same problem
   as tag opengl-V10-02-22.
 
 19th November 2016  John Allison
 - DAWN-V10-02-02, VRML-V10-02-03:
   Fixed the GetColour() problem.
 
 19th November 2016  Laurent Garnier (vis-V10-02-28)
 - opengl-V10-02-23:
   o Fix the gray/white/black screen when launching a new viewer.
   o Fix DEV-176 and perhaps a few others
 
 19th November 2016  Laurent Garnier (vis-V10-02-27)
 - opengl-V10-02-22 : Fis a color problem on transparent volumes (DEV-261)
 
 18th November 2016  John Allison
 - visman-V10-02-36, vis-HepRep-V10-02-04:
   Fixed the GetColour() problem.
 
 18th November 2016  Laurent Garnier (vis-V10-02-26)
 - visman-V10-02-35: Fixes display at end of run in Qt/Extra refresh for auto-refresh viewers. Fixes same in X and Xm.
 
 17th November 2016  Laurent Garnier  (vis-V10-02-25)
  vis-HepRep-V10-02-03, opengl-V10-02-21 : restore color to trajectories in HepRep, avoid two different OpenGL version
  in case of Qt+X
 
 7th November 2016  John Allison
 - vis-HepRep-V10-02-02: Fixed Coverity warning.
 
 6th November 2016 Laurent Garnier (vis-V10-02-24)
 - Fix a CDash warning in gl2ps
 
 4th November 2016 Laurent Garnier (vis-V10-02-23)
 - Co-works with interfaces-V10-02-09
 - Remove (multiple) scene tree/pick and viewer parameters from a tab to put it in a single, auto-update widget
 - Fix a bad signal/slot connection for the filter of the scene tree (perhaps a bug in some cases)
 
 3rd November 2016  John Allison (vis-V10-02-22)
 - modeling-V10-02-17, visman-V10-02-33:
   Changed default number of line segments per circle from 24 to 72.
 - visman-V10-02-33:
   Limited WARNING about up-Vector to first time only.
 
 2nd November 2016  John Allison
 - modeling-V10-02-16: G4ArrowModel: Default lines per circle = 6.
 
 26th October 2016  John Allison
 - visman-V10-02-32: Fixed inappropriate warning message in MT batch mode.
 
 2nd October 2016  John Allison (vis-V10-02-21)
 - visman-V10-02-31: Fixed warnings.
 
 29th September 2016  John Allison (vis-V10-02-20)
 - modeling-V10-02-15:
   o G4PhysicalVolumeModel:
     . Improved efficiency for the case that there are no vis attributes
       modifiers.
     . Added new operator<< for vector<G4PhysicalVolumeNodeID>.
 - visman-V10-02-30:
   o G4VSceneHandler::RequestPrimitives:
     . Tidied and improved error message for the case that a polyhedron
       pointer is null:
   o G4VViewer: Fixed Coverity warnings.
 
 23rd September 2016  John Allison (vis-V10-02-19)
 - visman-V10-02-29: Removed duplicate operator<<.
 - opengl-V10-02-19: Tidied.
 
 21st September 2016  John Allison (vis-V10-02-18)
 - opengl-V10-02-17: Fix warnings on Windows.
 
 21st September 2016  John Allison (vis-V10-02-17)
 - opengl-V10-02-16: Introduced /vis/ogl/flushAt.
 
 19th September 2016  John Allison
 - modeling-V10-02-14:
   o G4PhysicalVolumeModel.cc:
     Use static to ensure a plausible vis attributes pointer.
 - visman-V10-02-28:
   o /vis/viewer/save and /vis/viewer/interpolate:
     Default filename extension changed to .g4view.
 
 19th September 2016  John Allison (vis-V10-02-16)
 - modeling-V10-02-13:
   o Moved Vis Attributes Modifiers (VAMs) back from G4ViewParameters.
 - visman-V10-02-27:
   o Moved Vis Attributes Modifiers (VAMs) back to G4ModelingParameters.
 - opengl-V10-02-15:
   o Adapted to the move of Vis Attributes Modifiers back to
     G4ModelingParameters.
   o Added flag to handle scene tree interaction better.
 
 15th September 2016  John Allison
 - visman-V10-02-26:
   o G4VViewer: Introduced TouchableSetVisibility and TouchableSetColour.
   o G4Scene: Replaced warning reference to obsolete
     G4VisAttributes::Invisible to G4VisAttributes::GetInvisible()
    (B.Smith)
 - opengl-V10-02-14:
   o Re-instated G4OpenGLStoredQtViewer::CompareForKernelVisit:
   o Uses G4VViewer::TouchableSetVisibility and TouchableSetColour.
 
 13th September 2016  John Allison
 - visman-V10-02-25:
   o Replace all r-value references, e.g., auto&&, with simple
     l-value references, e.g., const auto&, until I understand
     r-value references.  I think we do not yet have a need for
     r-value references!
 
 12th September 2016  John Allison (vis-V10-02-15)
 - modeling-V10-02-12:
   o G4ModelingParameters.cc: Improved output of PVNameCopyNoPath.
 - visman-V10-02-24:
   o Introduced
       void G4VViewer::SetTouchable
     to set the touchable for /vis/touchable/set/... commands.
 - opengl-V10-02-13:
   o Added calls to SetTouchable.
 
 11th September 2016  John Allison (vis-V10-02-14)
 - modeling-V10-02-11:
   o Removed Vis Attributes Modifiers (VAMs).
   o VAMs are now entirely in G4ViewParameters and dealt with
     in G4VViewer::GetApplicableVisAttributes.
 - visman-V10-02-22:
   o Needs modeling-V10-02-11.
   o Moved Vis Attributes Modifiers (VAMs) from G4ModelingParameters
     to G4ViewParameters.
 - visman-V10-02-23, DAWN-V10-02-01, vis-HepRep-V10-01-03,
   VRML-V10-02-02, opengl-V10-02-12:
   o GetColour/GetColor no longer takes an argument.
   o Make sure applicable vis attributes are obtained.
   // Get and check applicable vis attributes.
        fpVisAttribs = fpViewer->GetApplicableVisAttributes(fpVisAttribs);
   // Note: the vis attributes may have been modified by the viewer.  See
   // code in G4VViewer::GetApplicableVisAttributes.
 
 7th September 2016  Gabriele Cosmo (vis-V10-02-13)
 - Fixed GNUmakefile in management, modeling and gMocren for missing
   dependency on global/HEPNumerics, now required.
 
 6th September 2016  Makoto Asai (vis-V10-02-12)
 - Further refinements. Co-works greps-V10-02-07, digits_hits-V10-02-06
 
 2nd September 2016  Makoto Asai (vis-V10-02-11)
 - Co-works greps-V10-02-06, digits_hits-V10-02-05
 - Build-in scorer now uses G4THitsMap<G4StatDouble> instead of
   G4THitsMap<G4double>. Affected files are :
      management/include/G4VSceneHandler.hh
      management/sources.cmake
      management/src/G4VSceneHandler.cc
      modeling/include/G4PSHitsModel.hh
      modeling/include/G4PseudoScene.hh
      modeling/sources.cmake
      VRML/include/G4VRML1FileSceneHandler.hh
      VRML/include/G4VRML1SceneHandler.hh
      VRML/include/G4VRML2FileSceneHandler.hh
      VRML/include/G4VRML2SceneHandler.hh
      HepRep/include/G4HepRepFileSceneHandler.hh
      HepRep/include/G4HepRepSceneHandler.hh
      OpenGL/include/G4OpenGLSceneHandler.hh
      OpenGL/src/G4OpenGLSceneHandler.cc
      FukuiRenderer/include/G4DAWNFILESceneHandler.hh
      gMocren/include/G4GMocrenFileSceneHandler.hh
      gMocren/sources.cmake
      gMocren/src/G4GMocrenFileSceneHandler.cc
      RayTracer/include/G4RayTracerSceneHandler.hh
      XXX/include/G4XXXFileSceneHandler.hh
      XXX/include/G4XXXSGSceneHandler.hh
      XXX/include/G4XXXStoredSceneHandler.hh
 
 31st August 2016  John Allison (vis-V10-02-10)
 - visman-V10-02-21: Fix warning.
 - DAWN-V10-02-00, vis-HepRep-V10-02-00, opengl-V10-02-10,
   raytracer-V10-02-01, VRML-V10-02-01, visXXX-V10-02-01,
   gMocren-V10-02-02
   o Fix G4Orb and G4Ellipsoid hiding warnings.
 
 31st August 2016  John Allison (vis-V10-02-09)
 - Co-works greps-V10-02-05.
 - modeling-V10-02-10: Conform to greps-V10-02-05.
 - visman-V10-02-20:
   o Conform to greps-V10-02-05.
   o Implemented auxiliary edge drawing for:
       G4Orb, G4Sphere, G4Torus and G4Ellipsoid
     unless otherwise specified.
 - vistree-V10-02-02: Improved printing and guidance.
 
 14th August 2016  John Allison (vis-V10-02-08)
 - modeling-V10-02-07: Improved safety.
 - visman-V10-02-19: Improved comments.
 - opengl-V10-02-09: Improved comments.
 - vistree-V10-02-01: G4ASCIITree:
   o Changed default verbosity to 1 (shows logical volume names).
 
 9th August 2016  John Allison (vis-V10-02-06 needs greps-V10-02-03)
 - Tagged.
 
 7th August 2016  John Allison (vis-V10-02-05 needs greps-V10-02-02)
 - modeling-V10-02-06: Takes account of new flag IsForceDrawingStyle.
 - visman-V10-02-17:
   o Takes account of new flag IsForceDrawingStyle.
   o Changed defaults of some command parameters to reflect obvious
     meaning in the command name.
 
 20th July 2016  John Allison (vis-V10-02-04)
 - modeling-V10-02-05 and visman-V10-02-16:
   Replaced TouchedVolume by EncounteredVolume in trajectory drawing
   and filtering.  Functionally identical.
 - visman-V10-02-16: Minor improvements to scale and axes.
 
 30th June 2016  John Allison
 - visman-V10-02-15: Added comments and fixed Coverity warning.
 
 14th June 2016  John Allison
 - visman-V10-02-14: Improved informationals and guidance.
 
 3rd June 2016  John Allison
 - visman-V10-02-13: Fixed compilation warnings on gcc-6.1.
 
 1st June 2016  Laurent Garnier (vis-V10-02-03)
 - gMocren-V10-02-01: Fixed coverity Win64 warning.
 
 1st June 2016  John Allison
 - visman-V10-02-11: Introduced /vis/viewer/interpolate.
 - visman-V10-02-12:
   o Fixed compiler error on Windows. /vis/viewer/interpolate is not
     available on Windows because it uses popen, a way of getting
     output from a system command. _popen (with an underscore) is
     said to be available in Windows but this has not been tried.
 - opengl-V10-02-06: Fixed bug in picking output text.
 - openinventor-V10-02-03: Fixed Coverity warning.
 
 30th May 2016  John Allison  (vis-V10-02-02)
 - visman-V10-02-10: Added some calls to SetView for security.
 - opengl-V10-02-05: G4OpenGLXViewer: Added thread awareness regarding
   glXMakeCurrent.  NOTE: This will have to be done for Win32
   for multithreading on Windows.
 - openinventor-V10-02-02:
   o Fixed dispatching (Guy Barrand, Tom Roberts).
   o setTransparencyType(SoGLRenderAction::SORTED_OBJECT_ADD).
 
 19th May 2016  John Allison
 - VRML-V10-02-00, gMocren-V10-02-00
   Fixed gcc-6.1 warnings.
 
 4th May 2016  John Allison
 - visman-V10-02-09: Win32 now opens with "/vis/open OGL" if Qt
   is not built.
 
 2nd May 2016  John Allison  (vis-V10-02-01)
 - modeling-V10-02-04: Fixed gcc-6.1 warning.
 - visman-V10-02-08: Fixed gcc-6.1 warnings.
 - raytracer-V10-02-00: Fixed gcc-6.1 warning.
 
 2nd May 2016  John Allison  (vis-V10-02-00)
 - Tagged: consolidates the below improvements.
 
 2nd May 2016  John Allison
 - visman-V10-02-07:
   MT mode: moved flush to end of vis thread.  This is so that all
   trajectories are flushed from vis thread before switching back to
   master thread.  Also fixes picking in MT mode.
 - opengl-V10-02-04: Xm: Ensure all items get flushed to screen, even
   when eventsDrawInterval is set >1.
 
 23rd April 2016  John Allison
 - opengl-V10-02-03:
   /vis/ogl/set/eventsDrawInterval and /vis/ogl/set/displayListLimit:
   Fixed some inconsistencies.
 
 5th April 2016  John Allison
 - modeling-V10-02-03: Tidied #include statements.
 - vistree-V10-02-00:
   o Prevented multiple writing of the informational header on
     the output file.
 
 22 Mar 2016  Gabriele Cosmo
 - openinventor-V10-02-00
   o Corrected delete statement in
     G4OpenInventorXtExaminerViewer::sortBookmarksCB().
   o Multiple improvements: 18 Dec 2015  Frederick Jones
 
 29th March 2016  John Allison
 - visman-V10-02-06: Fixed bug in /vis/scene/add/volume. It was
   preventing parallel worlds being added individually.
 
 11th March 2016  John Allison
 - visman-V10-02-05:
   o Inhibited use of BeginRun, BeginEvent, EndEvent and EndRun
     when vis is not enabled, for example after /vis/disable.
     In particular this prevents the start of the vis thread in
     multithreading mode.
 
 15th February 2016  John Allison
 - modeling-V10-02-02:
   Introduced drawing and filtering by touched volume.  I.e.,
     /vis/modeling/trajectories/create/drawByTouchedVolume
     /vis/filtering/trajectories/create/touchedVolumeFilter
 - visman-V10-02-04:
   Registered drawing and filtering by touched volume.
 
 10th February 2016  John Allison, Laurent Garnier, Andrea Dotti
 - opengl-V10-02-00:
   o Various small fixes and improvements.
 
 26th January 2016  John Allison
 - modeling-V10-02-01: Added some Set commands.
 - visXXX-V10-02-00: Improved CompareForKernelVisit.
 
 26th January 2016  John Allison
 - modeling-V10-02-00 and visman-V10-02-03:
   Fix problem with OriginVolume drawing and filtering in
   multithreading mode.
 
 19th January 2016  John Allison
 - visman-V10-02-02: Improved /vis/viewer/save.
 
 14th January 2016  John Allison
 - visman-V10-02-01: Improved error tracking:
 
 25th November 2015  Laurent Garnier (vis-V10-01-19)
 - HepRep tagged : vis-HepRep-V10-01-02
 
 19th November 2015  Laurent Garnier (vis-V10-01-18)
 - HepRep tagged : vis-HepRep-V10-01-01
 
 8th November 2015  Laurent Garnier (vis-V10-01-17)
 - opengl-V10-01-12 : Fix the "SetVisible" problem on
   * Linux/Windows
   * Mac with Qt4 (or with Qt5)
   but introduce another minor problem: when opening a new viewer, we have to update it by clic
   into viewer, or issue "/vis/viewer/refresh"
 
 1st November 2015  John Allison
 - visman-V10-01-20:
   o Introduced (again!) <chrono> for queue handling in MT mode.
     Except for Xeon Phi, which is protected by #ifndef __MIC__
 
 15th October 2015  John Allison
 - visman-V10-01-19:
   o Corrected end-of-run printing for the case of
   "/vis/multithreading/actionOnEventQueueFull discard".
   o Improved guidance and confirmation printing for /vis/viewer/save.
 
 2nd October 2015  John Allison
 - modeling-V10-01-05: Cosmetic improvements.
 
 1st October 2015  John Allison (vis-V10-01-16)
 - visman-V10-01-18 and modeling-V10-01-04:
   o Added "light" representation to /vis/scene/add/magneticField.
 
 1st October 2015  John Allison
 - visman-V10-01-17:
   o Reverted (again!) to G4THREADSLEEP for queue handling in MT mode.
 
 30th September 2015  John Allison
 - visman-V10-01-16:
   o Uses <chrono> for queue handling in MT mode.
   o New commands for multithreading:
     /vis/multithreading/actionOnEventQueueFull
     /vis/multithreading/maxEventQueueSize
 
 29th September 2015  John Allison (vis-V10-01-15)
 - Tagged.
 
 21st September 2015  John Allison
 - opengl-V10-01-11: Use <chrono> for picking.  (Another attempt.)
 
 19th August 2015  John Allison
 - visman-V10-01-15: Improvements to help and verbosity printing.
 
 5th August 2015  John Allison (vis-V10-01-13)
 visman-V10-01-14: Reverted to G4THREADSLEEP for queue handling in MT mode.
 opengl-V10-01-10: Reverted to G4THREADSLEEP for picking.
 
 1st August 2015  John Allison (vis-V10-01-12)
 - visman-V10-01-13, opengl-V10-01-09:
   o Uses <chrono>.
 
 1st August 2015  John Allison
 - visman-V10-01-12:
   o Use auto&& (rather than auto or auto&).
 
 30th July 2015  John Allison (vis-V10-01-09)
 - visman-V10-01-11:
   o Re-implemented graphics system fallback strategy.  A graphics system may
     have more than one nickname.  This is used for finding a fallback graphics
     systems when, for example, a Qt session is requested but the user has not
     instantiated a Qt session, or when interactive graphics systems are
     prohibited, as in batch mode.  This allows the user to run an application
     that is fully configured with all available graphics systems, even under
     circumstances for which the primary graphics system is inappropriate.  For
     example, it allows one to make a image with these commands in a batch macro:
       /vis/open OGL
       /vis/drawVolume
       /vis/ogl/export
   o Other small changes - see management/History.
 - opengl-V10-01-08:
   o Improved graphics system fallback strategy:
     . Implemented IsUISessionCompatible in G4OpenGLQt and G4OpenGLXm.
     . Qt not allowed unless a Qt session has been instantiated.
     . Interactive graphics systems (Qt, Xm) are not allowed in batch.
   o Several Qt developments (Laurent Garnier).
 - modeling-V10-01-03: Minor improvement.
 
 26th June 2015  John Allison
 - opengl-V10-01-07: Coverity fixes.
 
 3rd June 2015  John Allison (vis-V10-01-07)
 - Needs global-V10-01-13 for opengl-V10-01-06.
 - visman-V10-01-10: New interface in G4VViewer for MT.
 - opengl-V10-01-06
   o Introduced sleep while waiting for pick action
   o Migrate to new G4VViewer interface.
 - opengl-V10-01-05
   o A bit of cleaning in managing OpenGL context (Qt)
 
 20th March 2015  John Allison
 - visman-V10-01-08: Very minor tidying.
 
 9th March 2015  John Allison (vis-V10-01-06)
 - Tagged.
 
 8th March 2015  John Allison
 - visman-V10-01-07: Tidying and protecting.
 - vistree-V10-01-04 (needs modeling-V10-01-01):
   o G4ASCIITreeSceneHandler: Added polyhedron dump for verbosity >=7.
 
 7th March 2015  John Allison
 - modeling-V10-01-01:
   o Augment G4PhysicalVolumeModel interface.
   o G4PhysicalVolumeModel: Add local transformation attribute.
   o G4TouchableDumpScene.cc: Add polyhedron dump for use with
     /vis/touchable/dump.
 
 1st March 2015  John Allison
 - visman-V10-01-06:
   o Limited the use of G4USE_STD11 to the clang compiler for now.
 
 28th February 2015  John Allison
 - vistree-V10-01-03: Tidied and cleaned up att values after use.
 
 24th February 2015  John Allison
 - vistree-V10-01-01:
   o G4ASCIITreeSceneHandler: Added physical volume dump for verbosity >=6.
 
 7th February 2015  Akinori Kimura
 - gMocren-V10-01-01: fixed bugs of checking string lengths.
 
 3rd February 2015  John Allison
 - visman-V10-01-05: Introduced G4USE_STD11 and tidied.
 
 2nd February 2015  Gabriele Cosmo (vis-V10-01-05)
 - Fix to sources.cmake scripts in various modules to include missing
   dependency on external USolids library.
 - openinventor-V10-01-01: G4OpenInventorViewer & G4OpenInventorXtExtendedViewer,
   added viewer menu button and methods for PDF output (FJ).
 
 19th December 2014  John Allison
 - visexternal-V10-01-01: G4OpenGL2PSAction: added method setBufferSize() (FJ).
 
 19th December 2014  John Allison (vis-V10-01-04)
 - openinventor-V10-01-00: Corrected sources.cmake to include missing files.
 
 19th December 2014  John Allison (vis-V10-01-03)
 - visman-V10-01-02: Removed debug printing (MT mode).
 - opengl-V10-01-04: Removed debug printing (MT mode).
 
 16th December 2014  John Allison (vis-V10-01-02)
 - visman-V10-01-01: Fixed /vis/scene/add/eventID for MT mode.
 - opengl-V10-01-03: Fixed compiler warning.
 
 16th December 2014  John Allison (vis-V10-01-01)
 - Merged vis sub-thread branch.
 
 16th December 2014  John Allison  (vis-MT-branch-00-31)
 - Merged vis-V10-01-00.
 
 16th December 2014  John Allison (vis-V10-01-00)
 - visman-V10-01-00: Improved guidance for /vis/scene/add/extent.
 - opengl-V10-01-00/01/02: Fix a problem when zooming on small volumes.
 - openinventor-V10-01-00: Corrected sources.cmake to include missing files.
 
 28th November 2014  Laurent Garnier (vis-V10-00-15)
 - opengl-V10-00-28 :
   o Fix refresh problem due to a bad threading management
   o Fixes hidden marker field in Qt viewer properties.
   o Fixes a bug whereby hidden markers are not respected if 2D objects
     are drawn.
   o Fix a compilation issue with Wt driver
   o Fix some minor GUI visual issues
   o Allow viewer properties/picking/scene tree to be accessible
   from an external application
   o Fix JIRA DEV-173 about using external application
 - gMocren-V10-00-03
   o fixed warnings according to COVERITY
   o fixed STRING_OVERFLOW checks according to COVERITY
 - modeling-V10-00-12
 - visman-V10-00-30
 
 3rd December 2014  John Allison
 - Merged gMocren-V10-00-03.
 
 2nd December 2014  John Allison  (vis-MT-branch-00-30)
 - vis-MT-branch-00-man-18:
   o G4VisManager.cc: Tidied and simplified EndOfRun.
 - vis-MT-branch-00-opengl-12)
 - G4OpenGLStoredQtViewer::DrawView(): Removed thread restriction.
 - G4OpenGLQtViewer.cc: Messy experimental version.
 
 1st December 2014  John Allison
 - vis-MT-branch-00-man-17:
   o Moved KeepTheEvent from the vis sub-thread to EndOfEvent.
 - vis-MT-branch-00-man-16:
   o Prevented vis sub-thread for runs with no events.
 
 30th November 2014  John Allison
 - vis-MT-branch-00-man-15:
   o Introduced DoneWithMaster/VisSubThread.
 - vis-MT-branch-00-opengl-11:
   o Introduced DoneWithMaster/VisSubThread.
 - vis-MT-branch-00-man-14:
   o Rationalisation of vis sub-thread code and Begin/EndRun/Event.
   o Elimination of (commented out) ShowView and extra refresh for
     auto-refresh viewers.  See management/History.
 
 28th November 2014  John Allison  (vis-V10-00-14-JA-01)
 - modeling-V10-00-12: Tidied.
 - visman-V10-00-30: Get correct run manager in MT mode.
 - visman-V10-00-29: Fixed Coverity warning.
 
 26th November 2014  John Allison  (vis-V10-00-14-JA-00)
 - Private tag to assist merging wit MT vis-sub-thread version.
 
 26th November 2014  John Allison  (vis-MT-branch-00-29)
 - G4VisManager.cc: Bug fix:
   o fEventRefreshing = false removed from EndOfEvent.
 - vis-MT-branch-00-opengl-10: Merged opengl-V10-00-28 into MT version.
 - Merged gMocren-V10-00-02 into MT version.
 
 22nd November 2014  John Allison  (vis-MT-branch-00-28)
 - vis-MT-branch-00-man-11: Merged visman-V10-00-28 into MT version.
 - vis-MT-branch-00-man-12: Minor tidying of #include’s.
 - vis-MT-branch-00-opengl-09: Merged opengl-V10-00-27 into MT version.
 - raytracer-V10-00-00: Copied into MT version.
 
 21st November 2014  John Allison
 - visman-V10-00-28: Fix bug affecting file-writing viewers.
 
 20th November 2014  John Allison
 - visman-V10-00-27: Another go at fixing win7-vc12 compiler warnings.
 
 19th November 2014  John Allison
 - visman-V10-00-26: Fixed compiler warnings.
 
 17th November 2014  John Allison
 - visman-V10-00-25: Fixes for Coverity warnings.
 
 11th November 2014  John Allison
 - visman-V10-00-24: Improved /vis/scene/add/scale.
 
 8th November 2014  John Allison  (vis-V10-00-14)
 - visman-V10-00-23:
   o Fixed spelling mistake in messages.
   o Fixed win7-vc12 compiler warnings.
 
 8th November 2014  John Allison
 - Activated debug print statements.
 
 8th November 2014  John Allison  (vis-MT-branch-00-27)
 - vis-MT-branch-00-man-10: Fixed (again) win7-vc12 compiler warnings.
 - vis-MT-branch-00-opengl-08: Merged trunk again.  (Just History.)
 - Merged vis-V10-00-13.
 
 7th November 2014  John Allison  (vis-MT-branch-00-26)
 - vis-MT-branch-00-opengl-07: Merged the trunk into this branch.
 
 7th November 2014  John Allison  (vis-MT-branch-00-25)
 - vis-MT-branch-00-opengl-05: Merged the trunk into this branch.
 
 7th November 2014  Laurent Garnier (vis-V10-00-12 - vis-V10-00-13)
 - opengl-V10-00-22 - opengl-V10-00-23
 
 7th November 2014  John Allison  (vis-MT-branch-00-24)
 - vis-MT-branch-00-man-09: delete mtVisSubThread at end of run.
 - vis-MT-branch-00-man-08: Protected event queue with mutex locks.
 
 6th November 2014  John Allison  (vis-MT-branch-00-23)
 - vis-MT-branch-00-man-07: Fixed compiler warning.
 
 6th November 2014  John Allison  (vis-MT-branch-00-22)
 - vis-MT-branch-00-man-06:
   o Move event->PostProcessingFinished() into mutex protection.
 - vis-MT-branch-00-opengl-03:
  o Rename fWindow by fGLWidget and avoid problems for users using an
    external Qt Application (and external Main Window)
  o Remove resizing GLwidget *before* it was attached in the ui. This
    will prevent from a early repainting
 
 6th November 2014  Laurent Garnier
 - G4OpenGLQtViewer :
  o Rename fWindow by fGLWidget and avoid problems for users using an
    external Qt Application (and external Main Window)
  o Remove resizing GLwidget *before* it was attached in the ui. This
    will prevent from a early repainting
  o Fix warnings
 - G4OpenGLViewer :
   o Add ClearViewWithoutFlush() function
 - G4OpenGLStoredQtViewer/G4OpenGLImmediateQtViewer :
   o Add a protection in case vis is called in another thread than main thread
 - G4OpenGLStoredQtViewer:
   o Fix ugly window at beginning
 
 G4OpenGLWtViewer
   o Fix a problem with Wt include names on case sensitive systems
 
 5th November 2014  Laurent Garnier
 - G4OpenGLQtViewer:
  o Rename fWindow by fGLWidget and avoid problems for users using an external
    Qt Application (and external Main Window)
  o Remove resizing GLwidget *before* it was attached in the ui. This will prevent
    from a early repainting
 
 30th October 2014  Laurent Garnier (opengl-V10-00-21)
 - Tagged
 
 5th November 2014  John Allison  (vis-MT-branch-00-21)
 - vis-MT-branch-00-man-05: Protections and spelling corrections.
 
 4th November 2014  John Allison
 - vis-MT-branch-00-man-04: Fix win7-vc12 compiler warnings.
 
 2nd November 2014  John Allison  (vis-MT-branch-00-20)
 - vis-MT-branch-00-man-03: Added /vis/set/maxEventQueueSize.
   If, during a multithreaded run, the simulation gets ahead of the
   visualisation by more than this maximum, the simulation is delayed
   until the vis sub-thread has drawn a few more events.  You may
   change this maximum number of events with
   "/vis/set/maxEventQueueSize <N>", where N is the
   maximum number you wish to allow.  N <= 0 means "unlimited".
   To avoid visualisation altogether: "/vis/disable".
 
 1st November 2014  John Allison  (vis-MT-branch-00-18)
 - G4VisManager.cc: Limited the number of queued events.
 
 1st November 2014  John Allison  (vis-MT-branch-00-17)
   o vis-MT-branch-00-opengl-02: Fixed mistake in merging.
   o vis-MT-branch-00-man-01: Tidied.
 
 1st November 2014  John Allison  (vis-MT-branch-00-16)
 - Merged vis-V10-00-11 and tagged.  Includes:
   o vis-MT-branch-00-opengl-01
   o vis-MT-branch-00-man-00
 
 30th October 2014  Laurent Garnier (vis-V10-00-10 - vis-V10-00-11)
 - visexternal-V10-00-03
 - opengl-V10-00-21
 
 30th October 2014  John Allison
 - visman-V10-00-21: Added informationals about /vis/scene/add/extent.
 
 29th October 2014  John Allison
 - visman-V10-00-20: Added /vis/scene/add/extent.
   o Adds a dummy model with given extent to the current scene.
     This can be used to provide an extent to the scene even if
     no other models with extent are available. For example,
     even if there is no geometry.
 
 30th October 2014  John Allison  (vis-MT-branch-00-15)
 - G4VisManager.cc:
   o Fix drawing of events in refresh mode at end of run.
   o Fix shadowing of runManager pointer in MT mode.
 
 29th October 2014  John Allison  (vis-MT-branch-00-14)
 - Fixed event by event refreshing (/vis/scene/endOfEventAction refresh)
   in MT mode.
 
 29th October 2014  John Allison  (vis-MT-branch-00-13)
 - Merged the trunk into the branch and tagged.
 
 29th October 2014  John Allison
 - visman-V10-00-20: Added /vis/scene/add/extent.
   o Adds a dummy model with given extent to the current scene.
     This can be used to provide an extent to the scene even if
     no other models with extent are available. For example,
     even if there is no geometry.
 
 28th October 2014  John Allison  (vis-MT-branch-00-12)
 - More changes to Qt.
 
 28th October 2014  John Allison  (vis-MT-branch-00-10)
 - Incorporating Laurent's changes:
   o Prevent from calling redrawing scene inside a Vis Thread
 - Secured the vis manager against the possibility that someone
   builds Geant4 in multithreaded mode but only instantiates the
   normal run manager.
 #ifdef G4MULTITHREADED
   /* There is a static method G4Threading::IsMultithreadedApplication()
    that returns true only if G4MTRunManager is instantiated with MT
    installation. Thus method returns false if G4RunManager base class is
    instantiated even with the MT installation, or of course with sequential
    installation.
    */
   if(G4Threading::IsMultithreadedApplication()) {
     // Start vis sub-thread
     mtRunInProgress = true;
     mtVisSubThread = new G4Thread;
     G4THREADCREATE(mtVisSubThread,G4VisSubThread,this);
   }
 #endif
 
 28th October 2014  John Allison  (vis-MT-branch-00-09)
 - Merged in Laurent's and Makoto's changes.
 
 27th October 2014  John Allison  (vis-MT-branch-00-08)
 - Attempt at getting Qt to work in MT mode.
 - Fix some OpenGL issues - see OpenGL/History.
 - Merge developments from trunk.
 
 24th October 2014  John Allison  (vis-MT-branch-00-07)
 - Commented out intermediate checks on GLContext.
 
 24th October 2014  John Allison  (vis-MT-branch-00-06 needs co-tags)
 - Needs global-V10-00-38 and intercoms-V10-00-14.
 - Migrated to above tags.
 
 24th October 2014  John Allison  (vis-MT-branch-00-05)
 - Small fix and re-tag.
 
 24th October 2014  John Allison  (vis-MT-branch-00-04)
 - Event keeping moved to EndOfEvent.
 - Draw(const G4Event*) now longer needed; removed.
 
 24th October 2014  John Allison  (vis-MT-branch-00-03)
 - Merged in Laurent's changes and tagged.
 
 24th October 2014  John Allison  (vis-MT-branchpoint-00-02)
 - Moved event keeping to worker thread.
 
 22nd October 2014  John Allison  (vis-MT-branchpoint-00-01)
 - vis-MT-branch-00-visman-00: Sub-thread developments.
 - vis-MT-branch-00-opengl-00: Sub-thread developments.
 
 22nd October 2014  John Allison  (vis-MT-branchpoint-00)
 - A tag made on the trunk from which vis-MT-branch-00 has been made.
 
 22nd October 2014  John Allison
 - modeling-V10-00-08: Get appropriate run manager in MT mode.
 - opengl-V10-00-19: Some developments by Laurent.
 
 1st October 2014  John Allison
 - visman-V10-00-18:
   o G4VisManager: Split out some code in sequential version of EndOfEvent
     in preparation for re-use in multi-threading mode.
   o G4VisManager.cc and G4VSceneHandler.cc: Minor code improvements (Laurent).
 
 14th Aug 2014  John Allison  (vis-V10-00-09)
 - visman-V10-00-17: Changed default text size to 12 pixels.
 
 11th Aug 2014  John Allison  (vis-V10-00-08)
 - Re-tagged.  Needs greps-V10-00-06.
 
 11th Aug 2014  John Allison  (vis-V10-00-07)
 - modeling-V10-00-07: Added text size for axes labels.
 - visman-V10-00-16: Added text size control through /vis/set/textSize
   for /vis/scene/add/axes and /vis/scene/add/scale.
 
 6th June 2014  Laurent Garnier (vis-V10-00-06)
 - opengl-V10-00-08 :
   o G4OpenGLQtViewer: Fix a problem in viewer/set parameters
 
 5th June 2014  Laurent Garnier  (vis-V10-00-05)
 - opengl-V10-00-07 :
   o Speed improvments by avoiding a dynamic_cast
   o New Viewer parameters info panel (DEV-151)
 - gMocren-V10-00-01
   o FIX Problem 1585 - Memory leak in G4GMocrenFile.cc
 - visexternal-V10-00-00
   o Fix a bad text in G4OpenGL2PSAction
 
 27th May 2014  John Allison
 - visman-V10-00-10: /vis/specify and /vis/scene/add/logicalVolume:
   o Added flag for drawing/suppressing axes.
 
 19th May 2014  John Allison  (vis-V10-00-04)
 - modeling-V10-00-05:
   o Introduced G4TouchableDumpScene and G4PseudoScene.
 - visman-V10-00-09 - requires modeling-V10-00-05.
 - Added /vis/touchable/dump.  Dumps the G4Atts to G4cout.
 - Added parameter to /vis/scene/add/axes to suppress annotations.
 - G4VisCommands.cc: Fixed deprecated call to GetAttDefs.
 
 13th May 2014  John Allison  (vis-V10-00-03)
 - visman-V10-00-08, DAWN-V10-00-02, opengl-V10-00-05, openinventor-V10-00-01:
   o Moved G4VisFeaturesOf* to appropriate sub-categories.
 — visman-V10-00-07:
   o G4VisCommandsSceneAdd.cc:
     . Added axes to /vis/scene/add/logicalVolume.
     . Other small changes.
   o G4VisManager.hh:
     . GetInstance now public.
     . Thus removed cross-subcategory friendships.
 
 6th March 2014  John Allison
 - modeling-V10-00-04: Protection of zero pointers.
 - visman-V10-00-04: Coverity fix.
 
 4th February 2014  John Allison  (vis-V10-00-02)
 - openinventor-V10-00-00:
   o Fixed shadowing compilation warnings (Gabriele Cosmo).
   o Improvements to G4OpenInventorXtExaminerViewer (Fred Jones).
 
 25th January 2014  John Allison  (vis-V10-00-01)
 - modeling-V10-00-02:
   o GNUmakefile: Added dependency on run category.
   o G4PhysicalVolumeModel: Improved constructor.
 - visman-V10-00-03:
   o G4VisManager: Removed temporary model in Draw method for
     G4VPhysicalVolume introduced in visman-V10-00-01.
 - opengl-V10-00-01:
   o Improved protection of pointers.
 
 23rd January 2014  John Allison  (vis-V10-00-00)
 - modeling-V10-00-01:
   o G4TrajectoriesModel: Add run ID.
 - visman-V10-00-02:
   o Add run ID to G4Atts of user drawn trajectories.
 - opengl-V10-00-00:
   o Improvements to class design and some bug fixes for picking.
   o Some Qt fixes and improvements.
 
 13th January 2014  John Allison
 - modeling-V10-00-00: requires greps-V10-00-01:
   o Migration and minor development.
 - visman-V10-00-01: requires modeling-V10-00-00:
   o Migration and added protections.
   o Used temporary models for Draw methods for G4VTrajectory and
     G4VPhysicalVolume.
 
 10th December 2013  John Allison
 - visXXX-V10-00-00: G4XXXFile declared as G4VGraphicsSystem::fileWriter.
 - VRML-V10-00-00: VRML1/2File declared as G4VGraphicsSystem::fileWriter.
 
 9th December 2013  John Allison
 - visman-V10-00-00:
   o Introduced G4VGraphicsSystem::fileWriter to allow special informational.
   o Small bug fix for MT mode:
 - DAWN-V10-00-00: DAWNFILE declared as G4VGraphicsSystem::fileWriter.
 - gMocren-V10-00-00: gMocren declared as G4VGraphicsSystem::fileWriter.
 - vis-HepRep-V10-00-00:
   o HepRep and HepRepFile declared as G4VGraphicsSystem::fileWriter.
 
 23rd November 2013  Joseph Perl  (vis-V09-06-37)
 - opengl-V09-06-11: Fixes for Qt
 - opengl-V09-06-10: Fixes for Qt
 - VRML-V09-06-05: Some changes as suggested by PVS
 - raytracer-V09-06-07: Some changes as suggested by PVS and Coverity
 - modeling-V09-06-22: Some changes as suggested by PVS
 - vistree-V09-06-01: Some changes as suggested by PVS
 - DAWN-V09-06-06: Some changes as suggested by PVS
 - visman-V09-06-27: Fix for end-of-run action accumulate
 - visman-V09-06-26: Fix for smooth trajectories in MT mode
 
 9th November 2013  Joseph Perl  (vis-V09-06-36)
 - visman-V09-06-25 Command parameter updates
 - DAWN-V09-06-05 Replaced deprecated calls to solids accessor methods
 - VRML-V09-06-04 Replaced deprecated calls to solids accessor methods
 
 7th November 2013 Laurent Garnier
 - opengl-V09-06-09:
   o Fix the JIRA-Dev28 problem : Text displays in wrong position in Qt
 
 7th November 2013  John Allison
 - visman-V09-06-24: /vis/scene/add/date: Change positioning.
 
 7th November 2013  John Allison  (vis-V09-06-35)
 - visman-V09-06-23: Fix compilation error.
 
 6th November 2013  John Allison  (vis-V09-06-34)
 - modeling-V09-06-21: Tidying.
 - visman-V09-06-22: Further improvements to parameter guidance.
 
 4th November 2013  John Allison  (vis-V09-06-33)
 - visman-V09-06-21:
   o Fixes event keeping for MT mode when end-of-event-action is "refresh".
 
 3rd November 2013  John Allison  (vis-V09-06-32)
 - visman-V09-06-20:
   o Further improvements to event keeping and informationals.
 
 2nd November 2013  John Allison
 - visman-V09-06-19: Fixed event keeping in MT mode.
 
 1st November 2013  John Allison  (vis-V09-06-31)
 - Needs geom-specific-V09-06-22 and geomdiv-V09-06-04.
 - modeling-V09-06-20: Make use of G4GenericPolycone in G4ArrowModel.
 - visman-V09-06-18:
   o Printing brought under control of verbosity flag.
   o /vis/touchable/set/colour and several other commands:
     . Parameter guidance may be called only once. So instances of
       multiple calls to parameter guidance have been eliminated.
       Any extended information that was in parameter guidance has
       been moved to command guidance. This fixes a problem whereby
       guidance information was being lost and fixes a crash in the
       GAG interface.
 - opengl-V09-06-08: Lots of changes for Wt and OpenGL2 (Laurent).
 
 30th September 2013  John Allison  (vis-V09-06-30)
 - modeling-V09-06-19: Re-tagged after clean-up by Gunter and Mike.
 
 27th September 2013  Michael Kelsey  (vis-V09-06-29)
 - modeling-V09-06-18
   o Try to resolve SVN "modified" warnings due to 'Id' string use.
 
 25th September 2013  John Allison  (vis-V09-06-28)
 - visman-V09-06-17:
   o Vis commands are *not* be broadcast to threads.
   o Fix crash in EndOfEvent for batch MT mode.
 
 24th September 2013  John Allison  (vis-V09-06-27)
 - visman-V09-06-16:
   o /vis/reviewKeptEvents: Keep enabled state (ConcreteInstance pointer).
   o Implemented IgnoreStateChanges.
   o MT mode: Implemented maxNumberOfKeptEvents.
 
 21st September 2013  John Allison  (vis-V09-06-26)
 - modeling-V09-06-17: Fix compiler warnings.
 
 20th September 2013  John Allison  (vis-V09-06-25 needs greps-V09-06-11)
 - modeling-V09-06-16:
   o G4MagneticFieldModel:
   - Added $Id functionality.
   - Allowed for scene with extent not necessarily equal in x, y and z.
 - visman-V09-06-15
   o First implementation of multithreading visualisation:
   o Drawing from user code is explicitly ignored.
   o Events are kept until end of run, then drawn:
     - this could mean a huge consumption of memory.
     - to avoid this, "/vis/disable".
   o Some debug statements remain for testing.
 - visman-V09-06-14 (M.Asai)
   o Implementing IgnoreStateChanges() to be invoked from RayTracer and
     other utilities that have their own event loop.
 - visman-V09-06-13 (M.Asai)
   o Introducing G4VisManager::SetUpForAThread(). This method is invoked
     by G4WorkerRunManager so that G4VisManager will get noticed at the
     end of event of each worker thread.
 - raytracer-V09-06-02 to raytracer-V09-06-06:
   o Developments for multithreading (M.Asai)
   o Needs greps-V09-06-11.
 
 30th August 2013  John Allison  (vis-V09-06-24)
 - modeling-V09-06-15: - GNUmakefile: Added geometry/magneticfield/include.
 
 29th August 2013  John Allison  (vis-V09-06-23)
 - modeling-V09-06-14: Fixed a corrupted file (SVN glitch?).
 
 27th August 2013  John Allison  (vis-V09-06-22)
 - modeling-V09-06-13:
   o G4MagneticFieldModel: Removed diagnostic print statements.
 
 26th August 2013  John Allison
 - modeling-V09-06-12:
   o G4MagneticFieldModel: Variable no. of data points per half scene.
 - visman-V09-06-12:
   o /vis/scene/add/magneticField:
     . Added integer parameter: No. of data points per half scene.
 
 25th August 2013  John Allison
 - modeling-V09-06-11: G4MagneticFieldModel: Bug fix.
 
 24th August 2013  John Allison  (vis-V09-06-21)
 - visman-V09-06-11 and modeling-V09-06-09 (coworking)
   o Removed G4FlavoredParallelWorldModel.
 
 18th August 2013  John Allison (vis-V09-06-20 requires greps-V09-06-06)
 - modeling-V09-06-08: Added skeleton G4MagneticFieldModel.
 - visman-V09-06-10: Added /vis/scene/add/magneticField.
 
 30th July 2013  John Allison  (vis-V09-06-19)
 - visman-V09-06-09: Fixes Bugs 1499 and 1503.
 
 17th June 2013  John Allison  (vis-V09-06-18)
 - gMocren-V09-06-06: Reverted snprintf to sprintf.
   o snprintf not in cstdlib on Windows.
   o Mark as "intentional" on next Coverity analysis.
 
 17th June 2013  John Allison  (vis-V09-06-17)
 - opengl-V09-06-06:
   o Improvements for Wt and Qt5.
   o Skeleton (null effect) implementation of GetPrivateVisAttributesModifiers.
 
 16th June 2013  Makoto Asai
 - raytracer-V09-06-01:
   o Make G4RayTrajectory and G4RayTrajectoryPoint classes thread safe.
 
 16th June 2013  John Allison
 - modeling-V09-06-07: Small bug fix.
 - vis-HepRep-V09-06-06: Keep Coverity happy.
 
 15th June 2013  Akinori Kimura
 - gMocren-V09-06-05: Fixed warnings of Coverity.
 
 10th June 2013  John Allison
 - modeling-V09-06-06: G4ModelingParameters:
   o Replaced PVNameCopyNoPathNotEqual by appropriate operator!=.
   o Replaced VAMSNotEqual by appropriate operator!=.
 - visman-V09-06-07: G4ViewParameters.cc:
   o Migrated to modeling-V09-06-06.
 
 10th June 2013  John Allison
 - visman-V09-06-06: G4VViewer:
   o Added new virtual function:
     virtual const std::vector<G4ModelingParameters::VisAttributesModifier>*
     GetPrivateVisAttributesModifiers() const;
     // So that privately accumulated vis attributes modifiers may be
     // concatenated with the standard vis attributes modifiers for commands
     // such as /vis/viewer/set/all and /vis/viewer/save.
 
 4th June 2013  John Allison  (vis-V09-06-16)
 - gMocren-V09-06-04 (Akinori Kimura): Fixed Coverity warnings.
 
 3rd June 2013  John Allison  (vis-V09-06-15)
 - visexternal-V09-06-04: One more try at compiling on Windows!
 
 2nd June 2013  John Allison  (vis-V09-06-14)
 - visexternal-V09-06-03:
   o G4OpenGL2PSAction.cc: Added #include <cstdlib> and <cstring>.
 
 30th May 2013  John Allison  (vis-V09-06-13)
 - visexternal-V09-06-02: G4OpenGL2PSAction.cc: Added #include <limits>.
 
 29th May 2013  John Allison  (vis-V09-06-12)
 - modeling-V09-06-05: Bug fix for vis attribute modifying (VAM).
 - visman-V09-06-05: Improved safety, spelling and guidance.
 - openinventor-V09-06-04: SoCounterAction.cc: Coverity fix.
 
 26th March 2013  John Allison  (vis-V09-06-11)
 - modeling-V09-06-04: Improved G4Exception messages.
 - visXXX-V09-06-01, opengl-V09-06-04:
   o Removed or commented out unused typedefs that give warnings
     with gcc-4.8.0.
 - vis-HepRep-V09-06-05 (Ben Morgan): BUGFIX #1322: Fixes for zlib move.
 
 21st March 2013  Gabriele Cosmo  (vis-V09-06-10)
 - opengl-V09-06-03:
   o G4OpenGLQtExportDialog : changed "TRUE" by "true".
   o G4OpenGLViewer : added "const" on getWin...();
     removed bad "printf" statement.
   o G4OpenGLSceneHandler : Null pointer fix (thanks to XCode analyzer).
 - visexternals-V09-06-00:
   o Moved G4zlib package to source/externals; updated build configuration
     accordingly.
 - Requires co-working tag "externals-V09-06-00".
 
 15th March 2013  John Allison
 - openinventor-V09-06-03:
   o Changed strlcpy back to strncpy.  Fixes SLC5 compilation error.
     (Can't remember why I changed to strlcopy in the first place -
      see 29th January.  Only OpenInventor was changed.)
 
 24th February 2013  John Allison  (vis-V09-06-09)
 - modeling-V09-06-03, visman-V09-06-04, vis-HepRep-V09-06-04,
   openinventor-V09-06-02, gMocren-V09-06-03:
   o Removed unused fields as warned by new clang compiler.
 
 29th January 2013  John Allison  (vis-V09-06-08)
 - VRML-V09-06-03, DAWN-V09-06-03, vis-HepRep-V09-06-03,
   opengl-V09-06-02, openinventor-V09-06-01:
   o More Coverity fixes and un-doing of some previous ones.
 
 29th January 2013  John Allison  (vis-V09-06-06)
 - Changed strncpy and strncat to strlcpy and strlcat.
 
 21st January 2013  John Allison  (vis-V09-06-05)
 - Eliminated snprintf.
   o Not available on Windows.
   o Reverted to sprintf.
 
 21st January 2013  John Allison  (vis-V09-06-04)
 - Added #include <cstdio> in files containing snprintf.
 
 12-14th January 2013  John Allison  (vis-V09-06-03)
 - visman-V09-06-01, DAWN-V09-06-02, vis-HepRep-V09-06-02, opengl-V09-06-01,
   VRML-V09-06-01:
   o Coverity fixes.
 - modeling-V09-06-01 and 02:
   o Coverity fixes and new verbosity flag.
 - visman-V09-06-02 and 03:
   o Fixed bug in /vis/scene/add/trajectories.
 
 2nd December 2012  John Allison  (vis-V09-06-00)
 - Removed NURBS and references to i_mode:
   modeling-V09-06-00
   visman-V09-06-00
   VRML-V09-06-00
   vis-HepRep-V09-06-00
   opengl-V09-06-00
   openinventor-V09-06-00
   visXXX-V09-06-00
   gMocren-V09-06-00
   vistree-V09-06-00
   DAWN-V09-06-00
   raytracer-V09-06-00
 
 17th November 2012  John Allison  (vis-V09-05-49)
 - visman-V09-05-47:
   o Improved guidance on command directories.
 - openinventor-V09-05-17:
   o Reverted to openinventor-V09-05-14.
   o Fixed compiler warnings.
 
 13th November 2012  Laurent Garnier
 - opengl-V09-05-53:
   o Fix bug #1385 on Linux at launch.
 
 5th November 2012  John Allison
 - openinventor-V09-05-16:
   o Fixed libXpm linking problem.
 
 5th November 2012  Joseph Perl  (vis-V09-05-48)
 Rolling openinventor back to: openinventor-V09-05-14
 
 2nd November 2012  Joseph Perl  (vis-V09-05-47)
 -openinventor-V09-05-15:
   o Fixed Coin3D dependency issue (FJ).
 -visman-V09-05-46:
   o Tidied G4ViewParameters.hh (JA).
 - opengl-V09-05-51:
   o Fixed bug in display-list-re-use algorithm.
   o Fixed a possible problem in batch mode for Qt scene tree component.
 - opengl-V09-05-52:
   o Fix bug #1368, Qt batch mode display a window and printEPS (JA and LG).
 
 1st November 2012  John Allison  (vis-V09-05-46)
 - opengl-V09-05-50:
   o Fixed compiler warnings (FJ).
   o Fixed bug in printEPS for batch (LG).
 
 31st October 2012  John Allison
 - openinventor-V09-05-14:  FWJ
   o Fixed shadowed variables (compiler warnings).
   o Corrected unrecoverable zoom-out when switching
     to Perspective camera.
   o Fixed incomplete mouse-over position readout.
   o Added License and Disclaimer JA,
 
 30th October 2012  John Allison
 - visman-V09-05-45: Improved PrintAvailableGraphicsSystems.
 - opengl-V09-05-49:
   o printSize, etc. (set by /vis/ogl/printSize, etc.) made static, i.e.,
     applies to all OGL viewers.
   o Corrected effect of toggle transparency pop-up action.
 
 29th October 2012  John Allison
 - visman-V09-05-44: G4VisCommandsSceneAdd.cc: /vis/scene/add/date:
   o Added user-specified date-time as last argument(s) on command line.
 
 28th October 2012  Laurent Garnier
 - visexternal-V09-04-04 and visexternal-V09-04-05:
   o 26th October 2012  Laurent Garnier, recorded 28th October JA.
   o Remove create date in eps files (very useful to be able to compare them)
 
 27th October 2012  John Allison  (vis-V09-05-45)
 - visman-V09-05-43:
   o Implemented the concept of a "fallback" graphics system.  Used only
     Qt at present.  A Qt viewer will only work with a Qt session so if
     for a user instantiates a non-Qt session we wish to avoid instantiating
     a Qt viewer - instantiate, Xm, for example, instead.  (It's OK to
     instantiate a Qt viewer in batch - no window is opened, but one can create
     a scene, change view parameters and "/vis/ogl/printEPS" to get an
     eps file in batch.)
 - opengl-V09-05-48:
   o Solves problem of batch v. non-Qt session.
   o Records changes to colour and visibility of touchables in
     VisAttributesModifiers, so that they may be transmitted to other
     viewers.
   o Qt fixes.
   o Bug fix: Hidden markers can now be handled on-the-fly, i.e., without
     having to rebuild the display lists.
 
 24th October 2012  John Allison
 - modeling-V09-05-22 and visman-V09-05-42:
   o Improvements for printing of parameters and att defs.
 
 18th October 2012  John Allison  (vis-V09-05-44)
 - visman-V09-05-41:
   o Reverted to G4OpenInventorXt as the default OI for X Windows.
   o Get G4OpenInventorXtExtended with "/vis/open OIXE".
 - openinventor-V09-05-12 (Frederick Jones):
   o Bug fixes.
   o Disabled initial auto setting to first viewpoint of the new
     G4OpenInventorXtExaminerViewer.
 
 17th October 2012  John Allison  (vis-V09-05-43)
 - visman-V09-05-40:
   o Added G4OpenInventorXtExtended and made it the default OI for
     X Windows.
 - openinventor-V09-05-11:
   o Encapsulated Fred's code in a new driver, G4OpenInventorXtExtended
   (OIXE).
 - openinventor-V09-05-10 (Frederick Jones):
   o G4OpenInventorXtExaminerViewer
     . New class implements functional extensions to the
       Xt-based viewer.  A plug-in replacement for
       SoXtExaminerViewer (the standard viewer provided
       with Coin3d).
   o G4OpenInventorXtViewer
     . Instantiates G4OpenInventorXtExaminerViewer instead
       of SoXtExaminerViewer.  Added some additional menu items.
 
 12th October 2012  John Allison  (vis-V09-05-42)
 - opengl-V09-05-47, co-works interfaces-V09-05-20:
   o Introduced some trial code for capturing touchable colour changes.
 
 11th October 2012  John Allison
 - modeling-V09-05-21: Tidied.
 - visman-V09-05-39: Added /vis/viewer/save.
 
 9th October 2012  John Allison
 - modeling-V09-05-20: Tidied.
 - visman-V09-05-38: Fixed warnings.
 
 9th October 2012  John Allison  (vis-V09-05-41)
 - modeling-V09-05-19:
   o Added some utility functions.
 - visman-V09-05-37:
   o Completed /vis/touchable/set/ commands.
 
 8th October 2012  John Allison
 - modeling-V09-05-17 and modeling-V09-05-18:
   o Further refinement for /vis/touchable/set/...
 - modeling-V09-05-16:
   o Refined and added code for /vis/touchable/set/...
 
 7th October 2012  John Allison
 - modeling-V09-05-15: G4ModelingParameters:
   o Added VisAttributesModifiers, enums and a nested class for communicating a
     modification to the vis attributes for a specfic touchable defined by
     PVNameCopyNoPath, to be used by new commands, /vis/touchable/set/...
 - visman-V09-05-36:
   o Added the copying of VisAttributesModifiers to modeling parameters, ready
     for use by new commands, /vis/touchable/set/...
 - visXXX-V09-05-04:
   o Added test of VisAttributesModifiers to list checked for kernel visit.
 - openinventor-V09-05-09:
   o Added test of VisAttributesModifiers to list checked for kernel visit.
 
 6th October 2012  John Allison
 - modeling-V09-05-14:
   o G4PhysicalVolumeModel: Added SetBaseFullPVPath.  The base full path is the
     full path of the top physical volume (actually the full path of the mother
     of the top physical volume), so that even if a user issues
     "/vis/drawVolume sub-detector", the full path includes the base full path,
     i.e., the full path up to the world volume.
 - visman-V09-05-35:
   o G4VisCommandSceneAdd.cc: G4VisCommandSceneAddVolume:
     Pick up found full path from G4PhysicalVolumeSearchScene so that it can
     be passed to G4PhysicalVolumeModel as a base, as described above.
   o G4VSceneHandler: Deprecated NURBS to be removed at next major release.
 
 3rd October 2012  John Allison
 - visXXX-V09-05-03: Protected the case of G4LogicalVolumeModel.
 
 1st October 2012  John Allison  (vis-V09-05-40)
 - modeling-V09-05-13:
   o G4TrajectoriesModel: Added GetAttDefs and CreateCurrentAttValues for event ID.
 - visman-V09-05-34: Added eventID to G4Atts for trajectories.
 - visman-V09-05-33: Explicitly include units header.
 - opengl-V09-05-43: Improved performance for hidden markers.
 - opengl-V09-05-42: Fixed compiler warning.
 - opengl-V09-05-41: Explicitly include units header.
 - opengl-V09-05-40: Fixed compiler warnings.
 
 27th September 2012  John Allison
 - opengl-V09-05-39: Improved display list re-use.
 
 27th September 2012  John Allison  (vis-V09-05-39)
 - opengl-V09-05-38: Fix for small bug and compiler warnings.
 
 27th September 2012  John Allison  (vis-V09-05-38, co-works interfaces-V09-05-16)
 - visman-V09-05-32:
   o Added an extra refresh for auto-refresh viewers at end of run.
 - opengl-V09-05-37:
   o Major re-design of scene and transient processing.
 
 26th September 2012  John Allison
 - visman-V09-05-31: G4ViewParameters: Added useful Set methods.
 - visman-V09-05-29: Added G4VViewer::RefreshView().
 
 25th September 2012  John Allison  (vis-V09-05-37, co-works interfaces-V09-05-15)
 - modeling-V09-05-11:
   o G4ArrowModel.cc: Added protection (limited width to length/50).
 - visman-V09-05-28:
   o /vis/scene/add/axes: Added protection (limited width of axes to length/50).
 - opengl-V09-05-35:
   o  Tidied up.
 - opengl-V09-05-36:
   o A fix in Qt.
 - openinventor-V09-05-08:
   o Pick up default vis attributes if primitive has none.
 
 24th September 2012  John Allison
 - opengl-V09-05-34 - needs interfaces-V09-05-15:
   o Material (for surface rendering) follows glColor at all times.
   o Changed glColor3d to glColor4d throughout.
 
 6th September 2012  John Allison  (vis-V09-05-36, co-works interfaces-V09-05-12)
 - visman-V09-05-27:
   o Removed multi-requested parameter guidance.  Collapsed guidance to one
     long string with '\n' for new lines.  (G4UIparameter cannot cope with
     multi-line guidance.)
 - opengl-V09-05-31:
   o G4OpenGLSceneHandler and G4OpenGLStoredSceneHandler:
     . Protected against null result of dynamic_cast on viewer (shouldn't happen!!).
 
 4th September 2012  John Allison
 - modeling-V09-05-10: Bug fix for G4LogicalVolumeModel.
 
 9th August 2012  John Allison  (vis-V09-05-35, co-works interfaces-V09-05-11)
 - Tagged.
 
 8th August 2012  John Allison
 - opengl-V09-05-29: Fixes "unused parameter" warning.
 
 8th August 2012  John Allison  (vis-V09-05-34, co-works interfaces-V09-05-09)
 - vis-HepRep-V09-05-06, openinventor-V09-05-06,
   VRML-V09-05-05, gMocren-V09-05-05:
   o Intercepted 2D primitives - JustWarning printed.
 - visman-V09-05-26:
   o /vis/scene/add/frame: Fixed bug in SetParameterRange.
 - opengl-V09-05-28, coworks interfaces-V09-05-09:
   o Big changes to Qt interface
   o G4OpenGLStoredSceneHandler:
     . Moved colour from display list to PO so that a sub-class may
       modify through the new virtual function below.
   o G4OpenGLStoredViewer:
     . Added virtual void DisplayTimePOColourModification
           (G4Colour&, size_t /*currentPOListIndex*/) {}
       so that a sub-class may modify the colur/transparency.  (If the
       transparency is modified the rendering may not be optimal since
       the order of rendering is determined at POList construction time.)
 
 30th July 2012 Laurent Garnier
 - G4OpenGLQtViewer.cc :
   o Add search widget in scene tree
   o Double click now allow to change color/transparency
 
 23th July 2012 Laurent Garnier
 - G4OpenGLQtViewer.cc :
   o Do not apply changes to other viewer when moving scene tree slider
   o Fix a problem on scene tree with non touchable volumes
 
 19th July 2012  John Allison
 - G4OpenGLStored/ImmediateSceneHandler.cc:
   o Disabled GL_DEPTH_TEST and GL_LIGHTING for 2D objects, but see...
 - G4OpenGLSceneHandler.cc:
   o Disabled GL_DEPTH_TEST and GL_LIGHTING
 
 20th July 2012  John Allison
 - DAWN-V09-05-05:
   o Implemented 2D text.
   o Added print-once warnings for other 2D.
 
 17th July 2012  John Allison  (vis-V09-05-33, co-works interfaces-V09-05-08)
 - opengl-V09-05-27:
   o Fix Linux compiler warnings.
   o More Qt improvements.
 
 17th July 2012  John Allison  (vis-V09-05-32, co-works interfaces-V09-05-08)
 - visman-V09-05-25:
   o Improved /vis/viewer/copyViewFrom: added lights direction and move.
   o Moved fProcessing2D from G4OpenGLSceneHandler.
 - opengl-V09-05-26, co-works interfaces-V09-05-08:
   o Fixed text layout in Qt.
   o Improvements in Qt viewer.
   o Improvements in X viewers:
     . Now 3D text is hidden, when appropiate, by volumes drawn in surface mode.
   o Moved fProcessing2D to G4VSceneHandler.
   o Now may be used by all and any driver.
 
 13th July 2012 Laurent Garnier
 - G4OpenGLQtViewer : Updates in Scene tree viewer algorithm
   (speedup and fix transparency bug of 11th July).
 
 15th July 2012  John Allison
 - modeling-V09-05-09:
   o Introduced G4ArrowModel.
   o G4AxesModel: Re-implemented (uses G4ArrowModel).
 - visman-V09-05-24: Re-implemented:
   o /vis/scene/add/arrow
   o /vis/scene/add/axes
 
 11th July 2012 Laurent Garnier  (vis-V09-05-31, co-works interfaces-V09-05-08)
 - G4OpenGLQtViewer : Change Scene tree viewer algorithm
 
 9th July 2012  John Allison  (vis-V09-05-30)
 - Tagged.
 
 5th July 2012  Gabriele Cosmo
 - modeling-V09-05-08, visman-V09-05-23, opengl-V09-05-24,
   raytracer-V09-05-05, DAWN-V09-05-04,  VRML-V09-05-04,
   vis-HepRep-V09-05-04, gMocren-V09-05-04, :
   o Explicitly use inclusion of headers for system of units and physical
     constants, in plan to remove implicit inclusion from globals.hh.
 
 3rd July 2012  John Allison
 - raytracer-V09-05-04:
   o Fixed some Coverity warnings.
 
 3rd July 2012  John Allison  (vis-V09-05-29)
 - opengl-V09-05-23, openinventor-V09-05-05:
   o Fixed some Coverity warnings.
 - raytracer-V09-05-03:
   o Tagged a fix: uses std::sqrt.
 
 2nd July 2012  John Allison
 - opengl-V09-05-22:
   o Important bug-fix for non-display-list text (i.e., Qt).
 
 18th June 2012  John Allison  (vis-V09-05-28)
 - opengl-V09-05-21:
   o Fix drawing of non-display-list text.
 
 16th June 2012  John Allison  (vis-V09-05-27)
 - opengl-V09-05-20:
   o Fixes drawing of trajectories when no memory for display lists.
   o Fixes cases of extra drawing, causing loss of trajectories.
 - opengl-V09-05-19:
   o Added /vis/ogl/set/eventsDrawInterval.
 
 12th June 2012    John Allison  (vis-V09-05-26)
 - opengl-V09-05-18 (Laurent Garnier):
   o Fixed shadow warnings where possible.
   o Many warnings remain due to the use "s" and/or "sr" in Qt macros
     and headers.  These will have to wait until CLHEP global variables
     are fixed.
 
 10th June 2012  John Allison  (vis-V09-05-25)
 - vis-HepRep-V09-05-03: Fixed remaining shadow warnings.
 - Now all shadow warnings fixed except in Qt.
 
 8th June 2012  John Allison  (vis-V09-05-24)
 - DAWN-V09-05-03, raytracer-V09-05-02, vistree-V09-05-02, visXXX-V09-05-02,
   gMocren-V09-05-03, openinventor-V09-05-04:
   o Shadow clean.
 - vis-HepRep-V09-05-02, opengl-V09-05-17:
   o Partial shadow clean.
 
 7th June 2012  John Allison
 - modeling-V09-05-07, visman-V09-05-22:
   o Shadow clean.
 
 6th June 2012  John Allison  (vis-V09-05-23)
 - visman-V09-05-21: Fix compiler warning.
 
 5th June 2012  John Allison  (vis-V09-05-22)
 - visman-V09-05-20: Added /vis/scene/add/line(2D) and arrow(2D).
 
 3rd June 2012  John Allison
 - visman-V09-05-19: Coverity fixes.
 
 31st May 2012  John Allison
 - modeling-V09-05-06:
   o Brought stray print statement under control of verbosity.
   o Fixes bug report 1310.
 
 29th May 2012  John Allison  (vis-V09-05-21)
 - opengl-V09-05-16:
   o Fixed bug in vis-V09-05-20.
   o Implemented proper treatment of transparency in OpenGL stored mode
     in the case that trajectories passed through or behind transparent
     persistent objects (detector components).  Required proper ordering
     of display list execution.
 
 23rd May 2012  John Allison  (vis-V09-05-20)
 - Health Check 2012:
   o Over the years we have added drivers and features and added fixes.
     A health check revealed several instances of code duplication,
     unnecessary screen refeshing, incorrect buffer switching
     (necessitating extra refreshing), etc.  This tag is an attempt to
     bring the basic vis algorithms up to full health and efficiency.
     . visman-V09-05-18
     and consequent changes to
     . DAWN-V09-05-02
     . visXXX-V09-05-01
     . VRML-V09-05-03
     . vis-HepRep-V09-05-01
     . openinventor-V09-05-03
     . opengl-V09-05-15
 
 22nd May 2012  John Allison  (vis-V09-05-19)
 - opengl-V09-05-14: Fixed Linux compiler warnings.
 
 22nd May 2012  John Allison  (vis-V09-05-18)
 - opengl-V09-05-13:
   o Multiple fixes and improvements to Qt.
   o Introduced depth of geometry slider.
   o G4OpenGLStoredSceneHandler: Removed Set/Clear/Draw from EndModeling.
 
 22nd April 2012  John Allison  (vis-V09-05-17)
 - visman-V09-05-17: G4VisCommandsSceneAdd: Fixed compiler warnings.
 
 11th April 2012  John Allison
 - visman-V09-05-16: Added /vis/scene/activateModel.
 
 10th April 2012  John Allison  (vis-V09-05-16)
 - opengl-V09-05-12:
   o G4OpenGLWin32Viewer.cc: Make it work for Win64 (Pere Mato).
 - openinventor-V09-05-02:
   o G4OOpenInventorWinViewer.cc: Make it work for Win64 (Pere Mato).
 
 10th April 2012  John Allison  (vis-V09-05-15)
 - opengl-V09-05-11:
   o X and Xm drivers: Implemented text layout and offset.
   o G4OpenGLQtViewer : Many fixes.
   o G4OpenGLXm classes: Change G4Exception id to opengl20xx.
 
 10th April 2012  John Allison  (vis-V09-05-14)
 - modeling-V09-05-05: Undid deleterious effect of modeling-V09-05-02!!
 - visman-V09-05-15: Migrated to G4Scene::Model.
 - visman-V09-05-14: Added
   G4VisManager::RegisterRunDuration/EndOfEvent/EndOfRunUserVisAction.
   Now you can register any number of named vis actions and associate
   them with particular types of action.  They are added to the scene
   with /vis/scene/add/userAction [<name>] (default all).
 - gMocren-V09-05-01: Migrated to G4Scene::Model.
 - vistree-V09-05-01: Migrated to G4Scene::Model.
 
 8th April 2012  John Allison
 - visman-V09-05-13: Added /vis/viewer/copyViewFrom.
 - visman-V09-05-12: Added /vis/set/colour and /vis/set/lineWidth
 
 4th April 2012  John Allison  (vis-V09-05-14)
 - modeling-V09-05-04:
   o Added Get/SetType for all models (sub-classes of G4VModel).
   o G4PhysicalVolumeModel: Draw only one replica if top volume.
   o Other small improvements and fixes.
 - visman-V09-05-11: Many small improvements.
 - opengl-V09-05-10:
   o X and Xm drivers: Implemented text layout and offet.
 
 2nd April 2012  John Allison, Laurent Garnier  (vis-V09-05-13)
 - opengl-V09-05-09: Introduce QT tree ("Scene" panel in G4UIQt session).
 
 28th March 2012  John Allison
 - VRML-V09-05-02: Protect debug statement.
 
 26th March 2012  John Allison  (vis-V09-05-12)
 - visman-V09-05-10:
   o G4VisCommandsSet.cc: Added #include <cctype> for strict Windows compiler.
 
 23rd March 2012  John Allison  (vis-V09-05-11 - needs greps-V09-05-06)
 - visman-V09-05-09: Added /vis/set/textLayout.
 - modeling-V09-05-03: G4AxesModel: Augmented global description.
 
 21st March 2012  John Allison
 - visman-V09-05-08:
   o Introduced concept of "current quantities" for use in vis commands.
   o Added /vis/set/textColour, the first command in the series that
     will allow the user to change the above current quantities for use by
     subsequent commands.
 
 7th March 2012  John Allison  (vis-V09-05-10)
 - modeling-V09-05-02: G4CallbackModel: Add destructor.
 - visman-V09-05-07:
   o Added /vis/scene/add/logo2D and text2D.
   o Improved /vis/scene/add/axes, logo and scale:
     . Size computed automatically by default.
 
 6th March 2012  John Allison
 - opengl-V09-05-08: Fix problem with persistent text.
 
 29th February 2012  John Allison  (vis-V09-05-09)
 - opengl-V09-05-07: Fixed minor problem with text:
 
 28th February 2012  John Allison  (vis-V09-05-08)
 - visman-V09-05-06: Migrated to G4VScenehandler::fObjectTransformation.
 - opengl-V09-05-06:
   o Migrated to G4VScenehandler::fObjectTransformation.
   o Improved rendering speed (Laurent Garnier).
 - DAWN-V09-05-01
 - VRML-V09-05-01: Migrated to G4VScenehandler::fObjectTransformation.
 - vis-HepRep-V09-05-00: Migrated to G4VScenehandler::fObjectTransformation.
 - gMocren-V09-05-00: Migrated to G4VScenehandler::fObjectTransformation.
 
 27th February 2012  John Allison  (visJAfpObjectTranformation)
 - Private tag of code before change of fpObjectTranformation.
 
 14th February 2012  John Allison
 - opengl-V09-05-05:
   o Fixed bug in TO copy constructor that affected position of stored text.
   o General tidy.
 
 13th February 2012  John Allison  (vis-V09-05-07)
 - visman-V09-05-05: Small improvement to /vis/scene/add/eventID.
 - opengl-V09-05-04: Fix compilation error with gcc 4.3.
 
 11th February 2012  John Allison  (vis-V09-05-06)
 - Needs global-V09-05-00 and greps-V09-05-05.
 - Merged vis-V09-05-04-2ndbranch (tag vis-V09-05-04-2ndbranch-08) to trunk.
   Includes:
   o visman-V09-05-04: essentially same as visman-V09-05-03.
   o opengl-V09-05-03: Fixes text in Qt.  Other small improvements.
 
 11th February 2012  John Allison  (vis-V09-05-04-2ndbranch-08)
 - Tagged
 
 9th February 2012  John Allison
 - visman-V09-05-03:
   o Added /vis/scene/add/date and /vis/scene/add/frame.
   o /vis/scene/add/eventID: Added layout parameter.
 
 8th February 2012  John Allison
 - raytracer-V09-05-01: Adopt fix proposed by jasondet@gmail.com for
   up-vector bug #1274.
 
 7th February 2012  John Allison
 - raytracer-V09-05-00: Fix up-vector bug #1274.  Also other small fixes.
 
 7th February 2012  John Allison  (vis-V09-05-04-2ndbranch-07)
 - Needs greps-V09-05-05: Fixes to copy constructors.
 - vis-V09-05-04-2ndbranch-opengl-06: Uses above copy contructors.
 
 7th February 2012  John Allison  (vis-V09-05-04-2ndbranch-06)
 - vis-V09-05-04-2ndbranch-opengl-05:
   o PO/TOList: Changed G4Text* to G4TextPlus*.
 
 4th February 2012  John Allison  (vis-V09-05-04-2ndbranch-05)
 - Needs greps-V09-05-04 (G4Text copy constructor).
 - vis-V09-05-04-2ndbranch-opengl-04:
   o PO/TOList: Changed G4TextModel* to G4Text*.
   o Fixes a problem with TO text.
 
 2nd February 2012  John Allison  (vis-V09-05-04-2ndbranch-04)
 - vis-V09-05-04-2ndbranch-opengl-03:
   o Removed glDrawBuffer(GL_FRONT) when no memory for display lists.
   o G4OpenGLStoredViewer.cc:
     . When re-using AddPrimitive, by-pass the stored AddPrimitive to
       avoid making more display lists and other stuff in
       AddPrimitivePreamble, etc.  Use
         static_cast<G4OpenGLSceneHandler&>(fSceneHandler).
           G4OpenGLSceneHandler::AddPrimitive(...).
     . Fixes StoredQt text problem.
 
 1st February 2012  John Allison
 - vis-V09-05-04-2ndbranch-opengl-02: G4OpenGLStoredViewer::DrawDisplayLists:
   o Some systems, notably Qt, re-use model->DescribeYourselfTo(sceneHandler)
     but we don't want to create any further display lists, so...
       G4bool tempMFDL = fG4OpenGLStoredSceneHandler.fMemoryForDisplayLists;
       fG4OpenGLStoredSceneHandler.fMemoryForDisplayLists = false;
   o But text problem has come back!!!
 
 31st January 2012  John Allison  (vis-V09-05-04-2ndbranch-03)
 - vis-V09-05-04-2ndbranch-opengl-01:
   o G4OpenGLStoredQtViewer: Removed DrawText.  Fixes stored text problem.
 
 31st January 2012  John Allison  (vis-V09-05-04-2ndbranch-02)
 - vis-V09-05-04-2ndbranch-opengl-00:
   o Special case text: skeleton.  Some systems, notabley Qt, process
     text in a special way; it cannot be stored in display lists.  So the
     text model pointer is stored in the PO/TO and processed separately.
     (PO = Persistent object, TO = transient object.)  The nested classes
     G4OpenGLStoredSceneHandler::PO and TO keep relevent information,
     e.g., the display list index or, in this case, when relevant, a
     pointer to the G4TextModel.
 
 30th January 2012  John Allison  (vis-V09-05-04-2ndbranch-01)
 - VRML-V09-05-00, DAWN-V09-05-00:
   o Fixed Ubuntu warning about ignoring return value of system call.
 - vistree-V09-05-00:
   o G4VTreeSceneHandler.hh:
     . Removed empty implementations of Begin/EndPrimitives, so now
       picks up the default (and correct non-empty default
       implementations in G4VSceneHandler).  The problem is that
       objectTransformation must be set to something.  This was causing a
       G4Exception in G4VisManager::DrawT.
 
 13th January 2012  John Allison  (vis-V09-05-05)
 - DAWN-V09-05-00, VRML-V09-05-00:
   o Fixed Ubuntu warnings about ignoring return value of system call.
 - visman-V09-05-02, opengl-V09-05-02 (Laurent Garnier):
   o Fixes for Qt Stored text.
 
 12th January 2012  John Allison
 - vistree-V09-05-00: G4VTreeSceneHandler.hh:
   o Removed empty implementations of Begin/EndPrimitives, so now
     picks up the default (and correct non-empty default
     implementations in G4VSceneHandler).  The problem is that
     objectTransformation must be set to something.  This was causing a
     G4Exception in G4VisManager::DrawT.
 
 3rd January 2012  John Allison  (vis-V09-05-04)
 - modeling-V09-05-01: Validates geometry in all worlds.
 
 3rd January 2012  John Allison  (vis-V09-05-03)
 - opengl-V09-05-01 and openinventor-V09-05-00:
   o Removed #ifdef G4VIS... protection from header files so that they
     can be used for a possible dynamic library.  Of course, the
     protection remains on the implementation files.
 
 3rd January 2012  John Allison  (vis-V09-05-02)
 - visman-V09-05-01:
   o /vis/scene/notifyHandlers:
     . Downgraded "scene has changed" from WARNING to NOTE.
   o G4VisManager::EndOfEvent: Removed unwarranted DrawView.  It was
     causing two copies of the geometry to be drawn.
 - visXXX-V09-05-00:
   o Removed #ifdef ...XXXSG... protections.
     . No longer any reliance on imported tree code; own tree code used.
 - opengl-V09-05-00:
   o Corrected treatment of colour for transient objects.
   o G4OpenGLSceneHandler: Significant rationalisation.
 
 30th December 2011  John Allison  (vis-V09-05-01 co-works greps-V09-05-02)
 - modeling-V09-05-00: G4TrajectoriesModel::DescribeYourselfTo:
   o Used Begin/EndDraw to improve drawing speed.
     . Assumes all trajectories are drawn with the same transformation.
       If not, a fatal exception with be raised in G4VisManager::DrawT.
   o Changed FatalException to JustWarning in
     G4AttributeFilterT<T>::AddInterval and AddValue.
 - visman-V09-05-00:
   o G4VisManager: Implemented Begin/EndDraw(2D).
     . Note that this forces all thus-bracketed Draw messages to have the
       same transformation.  If an attempt to change the transformation
       is detected, a fatal exception is raised.
   o G4VSceneHandler: Added Get/SetObjectTransformation.
   o Marker size bug fix.
 
 2nd December 2011  John Allison (vis-V09-05-00)
 - Corresponds to geant4-09-05-ref-00.
 - opengl-V09-04-26 and 27: CMake improvements (Ben Morgan).
 - opengl-V09-04-28: Qt fixes (Laurent Garnier).
 - openinventor-V09-04-03 and 04: CMake improvements (Ben Morgan).
 
 15th November 2011  John Allison (vis-V09-04-18)
 - opengl-V09-04-25: Fix compiler warning + cosmetics.
 
 14th November 2011  Gabriele Cosmo (vis-V09-04-17)
 - Tagged
 
 14th November 2011  John Allison and Laurent Garnier
 - visman-V09-04-12: Changed "Fatal" to "JustWarning" for non-existent model.
 - opengl-V09-04-23: Bug fix for Qt < 4.4 and warning message improvement.
 
 12th November 2011  John Allison
 - opengl-V09-04-22: Minor fixes, suppression of debug printing.
 
 11th November 2011 Joseph Perl (vis-V09-04-16)
 - tag global tag for release 9.5
 
 11th November 2011  John Allison
 - modeling-V09-04-05: Coverity fix.
 - visman-V09-04-10: Fixed compiler warnings.
 - visman-V09-04-11: Coverity fix.
 - opengl-V09-04-20: Fixed compiler errors and warnings.
 - opengl-V09-04-21: Coverity fix.
 - visXXX-V09-04-01: Fixed compiler warnings.
 
 10th November 2011  Laurent Garnier
 - visexternal-V09-04-03: Fixes to gl2ps.
 - visXXX-V08-04-01: Implemented simple ad hoc tree and removed include/tree.
 
 8th November 2011  Ben Morgan
 - openinventor-V09-04-02:
   o source.cmake [BUGFIX #1196]: Added support for CMake build of OpenInventor
     driver (NB requires cotag cmake-V09-04-32).
 
 6th November 2011  Joseph Perl (vis-V09-04-15)
 - global tag for release 9.5
 - opengl-V09-04-19 backed off on release of tree viewer
 
 5th November 2011  Joseph Perl (vis-V09-04-14)
 - global tag for release 9.5
 - opengl-V09-04-17 fixed missing file from sources.cmake
 
 5th November 2011  Joseph Perl (vis-V09-04-13)
 - global tag for release 9.5
 - visman-V09-04-09 fixed missing file from sources.cmake
 
 5th November 2011  Joseph Perl (vis-V09-04-12)
 - global tag for release 9.5
 - On top of vis-V09-04-11:
   o modeling-V09-04-04
   o visman-V09-04-08
   o vis-HepRep-V09-04-03
   o vistest-V09-04-01
   o opengl-V09-04-16
 
 4th November 2011  John Allison
 - visman-V09-04-08 (needs greps-V09-04-09):
   o Added printing of available colours on nitialisation and in /vis/lst.
 - opengl-V09-04-15:
   o Qt improvements.
   o Use program loop to call display lists for "permanent objects"
     (instead of using a "top display list").
   o Fixed compilation warnings.
 
 30th October 2011  John Allison
 - modeling-V09-04-04:
   o Fixed compiler warning.
   o G4PhysicalVolumeModel: Added flag to G4PhysicalVolumeNodeID: true if drawn.
 - visman-V09-04-07:
   o Added concept of default view parameters.
   o These can be set in the vis manager for future operations either
     by code or by command.
   o Added /vis/default/hiddenEdge and /vis/default/style.
 
 28th October 2011  Joseph Perl
 - vis-HepRep-V09-04-03:
   o Add /vis/heprep/scale and /vis/heprep/center
 
 26th October 2011  John Allison
 - vistest-V09-04-01: Minor improvements.
 
 25th October 2011  John Allison
 - vistest-V09-04-00: Minor improvements.
 
 25th October 2011  John Allison  (vis-V09-04-11-01 on vis-V09-04-11-branch)
 - OpenGL: Reworked AddPrimitive for G4Polymarker.
 
 25th October 2011  John Allison  (vis-V09-04-11)
 - Another interim tag.
 - Branch for Begin/EndDrawGroup development - vis-V09-04-11-branch.
 
 21st October 2011  John Allison  (vis-V09-04-10)
 - Interim tag:
   o opengl-V09-04-14:
     . Fixed circles/squares problem.
     . Some work on ogl/print and gl2ps.
   o visexternal-V09-04-02:
     . gl2ps improvements.
 
 18th October 2011  John Allison  (vis-V09-04-09)
 - opengl-V09-04-13:
   Xm: Fixed consistency and reset issue with control panels.
   Stored mode: Improved efficiency for handling transients (trajectories).
 
 15th October 2011  John Allison
 - opengl-V09-04-12: Fixes to several problems:
   o Failure to see complete drawing on Mac (missing trajectories).
   o Slow drawing in Mac (reduced the frequency of glFlush).
   o Inconsistent parameters on Xm panels.
   o Sub-class parameters not being restet (introduced new virtual
       function, ResetView).
 
 13th October 2011  Andrea Dotti
 - vis-HepRep-V09-04-02:
   o Solving "variable set but not used" warning in GCC 4.6
 
 11th October 2011  John Allison
 - visman-V09-04-06: G4VisCommandsViewer: Introduce RefreshIfRequired.
 
 10th October 2011  John Allison
 - visman-V09-04-05:
   o G4VViewer: Added virtual function ResetView.
   o Do not set auto-refresh for viewers that are not auto-refresh by default.
 
 8th October 2011  Akinori Kimura
 - gMocren-V09-04-02: Fixed Coverity defects.
 
 7th October 2011  John Allison
 - modeling-V09-04-03: Improve warning messages.
 - opengl-V09-04-11: Fixed compilation warnings.
 
 6th October 2011 Laurent Garnier
 - opengl-V09-04-10: Fixed one more compilation error on Windows.
 
 3rd October 2011 Laurent Garnier
 - opengl-V09-04-09: Fix Warning with DrawText and compilation error on Windows.
 
 25th September 2011  John Allison (vis-V09-04-08)
 - modeling-V09-04-02: Migrated to new G4Exception.
 - visman-V09-04-04:  Migrated to new G4Exception.  Also:
   o G4VisCommandsSceneAdd.cc: When adding trajectories
     (/vis/scene/add/trajectories) print attributes even if warnings
     are suppressed.
   o Added /vis/viewer/set/rotationStyle
 - opengl-V09-04-08: Migrated to new G4Exception.  Also:
   o Fixed transparency problem.
   o Improved first pass rendering speed (reduced use of glFlush).
   o Fixed non-appearance of trajectories in Qt (added final glFlush).
   o Many improvements in Qt.
 - vis-HepRep-V09-04-01: Migrated to new G4Exception.
 - vistree-V09-04-01: Migrated to new G4Exception.
 - gMocren-V09-04-01: Migrated to new G4Exception.
 
 17th June 2011 Ben Morgan (vis-V09-04-07)
 - opengl-V09-04-05 : Support added for CMake build of Xm and Win32 components.
 - raytracer-V09-04-04 : Changed to use new standard GEANT4_USE_RAYTRACER_X11
   variable.
 
 17th June 2011  John Allison  (vis-V09-04-06)
 - opengl-V09-04-04: Re-instated cutaways in intersection mode.
 
 16th June 2011  John Allison  (vis-V09-04-05)
 - opengl-V09-04-03: L. Garnier:
   o Fix conflict with qgl.h and GL/gh.h in include files
 
 2nd June 2011  John Allison  (vis-V09-04-04)
 - opengl-V09-04-02: Coverity warning fixes and Qt developments.
 - vistree-V09-04-00: GNUmakefile : Remove OpenGL/Qt stuff from Makefile
 - visXXX-V08-04-00: GNUMakefile : Remove G4VIS_BUILD.gmk use
 
 17th May 2010  John Allison  (vis-V09-04-03)
 - visman-V09-04-02: Fixed warnings, added G4Scene::SetName.
 - DAWN-V09-04-00: Fixed gcc-4.6.0 warning.
 - opengl-V09-04-01:
   o Fixed numerous warnings.
   o Several fixes for interoperablility between Qt, X and Xm.
   o Qt improvemnts.
   o Eliminate Qt3 code.
 
 6th April 2011 Laurent Garnier
 - G4OpenGLQtViewer add flag for batch mode. It works !
 
 14th March 2011, Laurent Garnier
 - Add Wt driver files
 - G4VisExecutive.icc, G4VisFeaturesOfOpenGL, G4OpenGL.hh : Add some modifications for Wt Driver
 - G4OpenGLQtMovieDialog.hh : Add protection against mix between slots/signals from Qt and Wt (boost)
 
 1st March 2011  John Allison
 - raytracer-V09-04-01: Fix bug introduced by fix to Coverity warnings
 - raytracer-V09-04-00:
   o Trap recursive calls.
   o Fix Coverity warnings.
 
 26th January 2011  Gabriele Cosmo  (vis-V09-04-02)
 - Fixed compilation error in OpenInventor SbPainterPS.cc introduced in
   previous tag.
 - Fixed GNUmakefile in externals/gl2ps causing build failure.
 - Removed empty directories from main trunk.
 
 25th January 2011  John Allison  (vis-V09-04-01)
 - modeling-V09-04-01: Fixed unresolved reference.
 
 27th December 2010  John Allison  (vis-V09-04-00)
 - modeling-V09-04-00:
   o Changed some exceptions from FatalError to JustWarnings.
   o G4TrajectoryDrawerUtils.cc: Rework TimesValidity.
 - visman-V09-04-00:
   o Improvements to /vis/scene commands.
 - opengl-V09-04-00, openinventor-V09-04-00:
   o Fixed some Coverity warnings.
 - VRML-V09-04-00, visexternal-V09-04-00:
   o GNUmakefile : Remove Qt stuff.
 
 15th November 2010  Joseph Perl (vis-V09-03-13)
 - Global Vis Tag. Candidate for Geant4 release 9.4
 - modeling-V09-03-05 - Fix for time-slicing problem.
 
 13th November 2010  Joseph Perl ((vis-V09-03-12)
 - Global Vis Tag. Candidate for Geant4 release 9.4
 
 13th November 2010  John Allison
 - opengl-V09-03-10: Added verbosity control.
 - visexternal-V09-03-03: Fix for VC++.
 - visman-V09-03-15: Code tidying.
 - vistree-V09-03-00: Tagged inclusion of CMake stuff.
 - All tags include CMake stuff.
 
 11th November 2010  Akinori Kimura
 - DAWN-V09-03-01, gMocren-V09-03-05, VRML-V09-03-01:
   o Replaced G4cerr with G4cout and added verbosity control.
 
 10th November 2010  John Allison
 - openinventor-V09-03-02: Protected output with G4VisManager::confirmations.
 
 8th November 2010  John Allison  (vis-V09-03-11)
 - opengl-V09-03-09: Tidied display list limit.
 
 7th November 2010  John Allison  (vis-V09-03-10)
 - visman-V09-03-14:
   o G4VisExecutive.icc: Inlined constructor.
   o Fixed Coverity warnings.
 - visexternal-V09-03-02: Fixed Linux warnings.
 - vis-HepRep-V09-03-04: Fixed Linux warnings (Joseph).
 
 5th November 2010, John Allison
 - modeling-V09-03-04: Fixed Coverity warnings.
 - visman-V09-03-13: Fixed Coverity warnings.
 - visexternal-V09-03-01: Update gl2ps to 1.3.5 (Laurent).
 
 27th October 2010  John Allison
 - vistest-V09-03-01: Replaced MyPhysicsList by QGSP_BERT.
 - raytracer-V09-03-03/4: Changes to GNUmakefile (Gabriele Cosmo).
 
 8th October 2010  John Allison  (vis-V09-03-09 with co-working tags...)
 - Co-working tags: interfaces-V09-03-12 + config-V09-03-08
 - visman-V09-03-12:
   o Added /vis/viewer/set/defaultColour and defaultTextColour.
 - opengl-V09-03-07/08:
   o Improved kernel visit trigger.
   o Time-slices fade to background colour.
   o Many improvements to Qt.
 - openinventor-V09-03-01:
   o Improved kernel visit trigger.
 - visXXX-V08-03-00:
   o Improved kernel visit trigger.
 - visexternal-V09-03-00:
   o G4OpenGL2PSAction : add new method to set viewport.
 - gMocren-V09-03-04:
   o Added missing inclusion of <sstream>.
 
 15th June 2010  John Allison  (vis-V09-03-08)
 - visman-V09-03-10:
   o Added virtual destructors to fix compilation warnings.
   o Improved action after "/vis/geometry/..." commands.
 - raytracer-V09-03-02 (Gabriele Cosmo):
   o Added virtual destructors to fix compilation warnings.
 
 4th June 2010  Joseph Perl  (vis-V09-03-07)
 - vis-HepRep-V09-03-02
   o Added command renderCylAsPolygon
 - opengl-V09-03-07
   o G4OpenGLImmediate/StoredQtViewer : Add protection against multiple
   repaint call. Add protection against resizeGl with bad values
 
 3rd June 2010  John Allison
 - opengl-V09-03-06:
   o Restored all behaviour-sensitive changes to geant4-09-03.
 - visman-V09-03-09:
   o Fixed unchecked pointer.
   o Changed /vis/scene/add/digiti[sz]ations to /vis/scene/add/digis.
 - opengl-V09-03-05:
   o Restored some changes to geant4-09-03 to preserve behaviour.
 
 1st June 2010  John Allison
 - modeling-V09-03-03: Added default colours to G4TrajectoryDrawByParticleID.
 
 1st June 2010  John Allison  (vis-V09-03-06)
 - visman-V09-03-07:
   o Made fVerbosity and GetVerbosity static (saves having to get vis
     manager pointer).
 - gMocren-V09-03-03: Removed dependency on G4VisManager.
 
 30th May 2010  John Allison  (vis-V09-03-05)
 - Co-works greps-V09-03-02.
 - modeling-V09-03-02: Added G4DigiModel and G4DigiFilterFactories.
 - visman-V09-03-06:
   o Added /vis/scene/add/digiti[sz]ations and /vis/filtering/digi.
   o Added AddCompound(const G4VDigi&).
 - opengl-V09-03-04, gMocren-V09-03-02, VRML-V09-03-00, DAWN-V09-03-00,
   raytracer-V09-03-01, vis-HepRep-V09-03-00:
   o Added AddCompound(const G4VDigi&).
 
 29th May 2010  John Allison  (vis-V09-03-04)
 - Co-works greps-V09-03-01 and tracking-V09-03-03.
 - visman-V09-03-05:
   o Introduced DispatchToModel without i_mode.
   o Moved i-mode deprecation warnings to G4VTrajectory.
   o Improved /vis/viewer/rebuild.
 - opengl-V09-03-03: Improvements.
 - raytracer-V09-03-00: Added DrawTrajectory() ready for i_mode migration.
 
 28th May 2010  John Allison  (vis-V09-03-03)
 - Co-works interfaces-V09-03-04.
 - visman-V09-03-03: Change order of flags to follow G4UIExecutive.
 - visman-V09-03-04: G4VisManager, G4VisExecutive:
   Introduced optional verbosity string argument in constructor.  You
   can now write, for example:
     G4VisManager* visManager = new G4VisExecutive("quiet");
   Note that the default is "warnings":
     G4VisManager* visManager = new G4VisExecutive;
 - modeling-V09-03-01: Fixed unused parameter 'i_mode' warning.
 
 26th May 2010  John Allison  (vis-V09-03-02)
 - Co-working: intercoms-V09-03-01, interfaces-V09-03-03, greps-V09-03-00.
 - visman-V09-03-02: Added generic drivers: OGL, OGLI, OGLS, OI.
 - openinventor-V09-03-00: Protection against repeated initialisation.
 - opengl-V09-03-02: Some improvments with auto rotation mode.
 
 20th May 2010  John Allison  (vis-V09-03-01)
 - Co-working tags: intercoms-V09-03-01, interfaces-V09-03-02
 - opengl-V09-03-01:
   o GNUMakefile, G4OpenGLQtViewer : Better inclusion of new tabs in UI part
 - visman-V09-03-01:
   o Restore previous viewer after /vis/drawTree.
 
 11th May 2010  John Allison  (vis-V09-03-00)
 - visman-09-03-00: Print i_mode warnings.
 - modeling-V09-03-00:
   o Replace polyhedra with solids for sections and cutaways.
   o Trap use of i_mode and print warning.
 - opengl-V09-03-00:
   o Many improvements to OpenGL Qt.
   o Speed improvements for polymarkers (e.g., trajectories).
   o Use generic section and cutaway algorithm.
 - gMocren-V09-03-01: printing improvement.
 - vistest-V09-03-00: Added printEPS to test19.g4m, as suggested by Laurent.
 
 22nd November 2009  Joseph Perl (vis-V09-02-12)
 - vis-HepRep-V09-02-03
   o Changed messenger to a singleton.
   o Added messenger commands to HepRepFile.
   o Render G4Tubs as polygons if G4Tubs is not at a standard angle.
 
 22nd November 2009  John Allison
 - visman-V09-02-08: /vis/scene/add/trajectories rich:
   o Added G4RichTrajectoryPoint().GetAttDefs() to informational.
 
 18th November 2009  Gabriele Cosmo
 - visexternal-V09-02-06:
   o Added GLOBLIBS dependencies.
   o Re-instated fix to gl2ps.cc (always #define GL2PS_HAVE_ZLIB).
 
 17th November 2009  John Allison  (vis-V09-02-11)
 - visman-V09-02-07:
   o Many small bug fixes.
   o Enhanced functionality for gMocren driver:
     . Introduced the concept of end-of-run model.
 - opengl-V09-02-10: Fixes build problem with gl2ps on Windows.
 - openinventor-V09-02-03: Fixes build problem with gl2ps on Windows.
 - Tagged for vis tag.
 - visexternal-V09-02-05:
   o gl2ps: Added dependency on zlib if G4LIB_BUILD_ZLIB is set.
 
 17th November 2009  Laurent Garnier
 - Allow arbitrary viewer deletion (fixes crash)
 
 17th November 2009  Gabriele Cosmo
 - GNUmakefile: Added SUBLIBS += G4gl2ps for OPENGL and OI.
 
 15th November 2009  John Allison
 - raytracer-V09-02-02: Formal tag to record fixing of bugzilla Problem 1072.
 
 6th November 2009  John Allison
 - vistest-V09-02-01: test19.cc: Use G4UIExecutive.
 
 3rd November 2009  John Allison  (vis-V09-02-10, greps-V09-02-03, digits_hits-V09-02-02)
 - gMocren-V09-02-01:
   o Entrust AddEndOfEventModel to /vis/scene/add/psHits or hits.
   o Fix compiler warnings.
 - opengl-V09-02-09: Fix compilation problems and protect Qt3.
 
 30th October 2009  John Allison
 - visman-V09-02-06: Added /vis/scene/add/psHits.
 
 23rd October 2009  John Allison  (vis-V09-02-09, greps-V09-02-02, digits_hits-V09-02-02)
 - visman-V09-02-05: Implemented default behaviour in
   G4VSceneHandler::AddCompound (const G4THitsMap<G4double>&).
 
 22nd October 2009  John Allison  (vis-V09-02-08, greps-V09-02-02, digits_hits-V09-02-02)
 - modeling-V09-02-05: Added G4PSHitsModel for gMocren driver.
 - gMocren-V09-02-00: G4PSHitsModel moved to modelling.
 
 21st October 2009  John Allison  (vis-V09-02-07 coworks greps-V09-02-02)
 - greps-V09-02-02 adds new pure virtual function,
   AddCompound (const G4THitsMap<G4double>&).  The following tags
   accomodate:
   o modeling-V09-02-04
   o visman-V09-02-04
   o DAWN-V09-02-00
   o vis-HepRep-V09-02-02
   o opengl-V09-02-08
   o raytracer-V09-02-01
   o VRML-V09-02-01
   o visXXX-V09-02-00
 
 15st October 2009 Laurent Garnier
  - G4OpenGLViewer.cc : Fix a problem with printing.
 
 13st October 2009 Laurent Garnier
  - G4OpenGLQtViewer.cc/G4OpenGLStoreQtViewer.cc : Fix problems with
    mac OS X 10.6
 
 10th October 2009 Joseph Perl (vis-V09-02-06)
 - new global tag for vis, in preparation for  addition of gMocren file driver
 
 10th October 2009  John Allison
 - modeling-V09-02-03: Added G4PhysicalVolumeModelTouchable.  Used in
   ComputeMaterial.  Effective for nested parameterisations.
 
 29th September 2009  John Allison  (allison20090929)
 - modeling-V09-02-02: Added warning if logical volume not defined.
 - visman-V09-02-03:
   o Allow refresh in GeomClosed as well as Idle state.
   o Fixed uninitialised pointers.
   o G4VisManager.cc: Considerable tidy up.
 - opengl-V09-02-07:  Tagged work by Laurent Garnier:
   o G4OpenGLXmViewer : Fix a wrong initialization introduce by the
     new way of handling window size hints (January 2009)
   o G4OpenGLQtViewer : Ensure the GL frame size will be correct
     by setting a 0 size margin around
   o G4OpenGLStoredQtViewer : Remove picking to true at initialisation
 - openinventor-V09-02-02:  Tagged work by Laurent Garnier:
   o G4OpenInventorXt/WinViewer: Fix a wrong initialization introduce by the
     new way of handling window size hints (January 2009)
   o Remove Geant4_gl2ps.h gl2ps.cc gl2ps.h which were copied in external/gl2ps
     in february but forgot to remove them from OpenInventor
 - vistest-V09-02-00: Changed main program, test19.cc, to use G4UIExecutive.
 - VRML-V09-02-00: Tagged change of disclaimer on file headings (made long ago).
 
 16 September 2009  John Allison
 - raytracer-V09-02-00: Cosmetic adjustments and tagging.
 
 19 August 2009 Laurent Garnier
  - RayTracer : Fix an bad use of fVP parameters [bugzilla Problem 1072]
 
 18 May 2009, Joseph Perl (vis-V09-02-05)
 - opengl-V09-02-04: add missing header to G4OpenGLViewerMessenger.hh
 
 15 May 2009, Joseph Perl (vis-V09-02-04)
 - opengl-V09-02-04: Improvements to GL and Qt, printing, redraw logic,
   debug messages and fixes for compiler warnings
 - visman-V09-02-02:Added /vis/viewer/set/targetPoint,
   improved end of run event keeping information
 - vis-HepRep-V09-02-00:resolve compilation errors reported by gcc-4.4.0
 
 14th May 2009  Laurent Garnier
  - opengl-V09-02-04 Added /vis/ogl/set/printSize and /vis/ogl/set/printFilename
 
 13th May 2009  John Allison
 - visman-V09-02-02: Added /vis/viewer/set/targetPoint and minor
   wording improvements.
 
 6 May 2009, Laurent Garnier
  - G4OpenGLQtViewer.cc: Fix compilation warning and error with gcc4.4
 
 29 April 2009, John Allison (vis-V09-02-03)
 - visexternal-V09-02-04: Fix a circular dependency to G4OpenGL.
 
 28th April 2009, Laurent Garnier
  - printEPS is now fully functionnal for X, Xm, Qt Win viewers.
 
 27th April 2009  John Allison (vis-V09-02-02)
 - opengl-V09-02-03: Fix compiler warnings.
 - visexternal-V09-02-03: Fix compiler warnings.
 
 6th April 2009  Joseph Perl (vis-V09-02-01)
 - opengl-V09-02-02 : Improvments in order to use GL2PS for printing
 - openinventor-V09-02-01 : Improvments in order to use GL2PS for printing
 - visexternal-V09-02-02 :  Add GL2PS library in external (it was in
   OpenInventor before)
 
 14th March 2009  John Allison
 - visman-V09-02-01:
   o Introduced /vis/initialize.
   o G4VisManager.cc: /vis/verbose and /vis/initialize instantiated in
     constructor so that a user may set verbosity before initialisation.
   o G4VisExecutive.icc: made methods inline.
 
 5th March 2009, Laurent Garnier
  - Now using Gl2PS method to do PS
  - Add flag in GNUMakefile to compile in debug mode
  - Remplacing glBitmap by GL_POINTS to draw marker : Speed improvment
   and gl2ps can now draw Markers.
 
 25th February 2009  John Allison
 - modeling-V09-02-01 - needs greps-V09-02-01:
   o G4ModelApplyCommandsT: Added visManager->NotifyHandlers() after
     application (Apply) of all commands.  Forces update of all viewers
     after a change of model, e.g., trajectory colour, point size, etc.
 - visman-V09-02-00 - needs greps-V09-02-01:
   o G4VisManager: Implemented NotifyHandlers.  A user may notify scene
     handlers (G4VGraphicsScene objects) that the scene has changed so
     that they may rebuild their graphics database, if any, and redraw
     all views.
 
 24th February 2009  John Allison
 - modeling-V09-02-00 - needs greps-V09-02-00:
   o Added setAux/StepPtsSizeType commands (candidates: "none world screen").
   o Added unit to setAux/StepPtsSize for SizeType == world.
 
 16 February 2009, Laurent Garnier
  - Creation of this gl2ps library in order to have a gl2ps for all viewers.
  - GNUMakefile : Add the gl2ps external library
  - Some modifications in GNUMakefile for gl2ps. Packages OpenInventor,
    OpenGL had also been modified for gl2ps.
 
 22th January 2009  Laurent Garnier
 - Fix bug in ratio and geometry on X/Xm/Qt/Win32 viewers. Now Could
   pass XString like 400x600-0+0 to viewers and set position and location.
 
 21st November 2008  Joseph Perl  (vis-V09-01-06)
 - visman-V09-01-05: Trap recursive use of /vis/reviewKeptEvents.
 - modeling-V09-01-01: Improve message.
 - opengl-V09-01-03: Many changes to add Qt support.
 
 30th April 2008  John Allison  (vis-V09-01-05)
 - visman-V09-01-04: Fixes more gcc-4.3.0 compiler warnings.
 - openinventor-V09-01-01: Fixes more gcc-4.3.0 compiler warnings.
 
 28th April 2008  John Allison  (vis-V09-01-04)
 - visman-V09-01-03: Cosmetic improvements.
 - opengl-V09-01-02: Tidied.
 
 4th April 2008  John Allison  (vis-V09-01-03, needs greps-V09-01-03)
 - Back on HEAD.  Contains vis-V09-01-00.
 - visman-V09-01-02: Fixed gcc-4.3.0 compiler warnings.
 - opengl-V09-01-01:
   o Fixed gcc-4.3.0 compiler warnings.
   o Fixed DBL_MAX problem in 2D drawing.
   o A lot of Qt development.
 - openinventor-V09-01-00): Fixed most gcc-4.3.0 compiler warnings.
 - raytracer-V09-01-00): Fixed gcc-4.3.0 compiler warnings.
 - vistest-V09-01-01: Zero thickness of box for 2D drawing.
 
 30th January 2008  John Allison  (vis-V09-01-02)
 - Bug fix tag (re-instated G4DAWNFILE) on branch vis-V09-00-03-branch.
 - DOES NOT CONTAIN vis-V09-01-00 STUFF.
 
 29th January 2008  John Allison  (vis-V09-01-01)
 - visman-V09-01-01: Re-instated G4DAWNFILE (somehow got lost!!)
 
 4th January 2008  John Allison  (vis-V09-01-00 with greps-V09-01-00)
 - Draw2D capability, already available for G4Text, extended to:
   G4Circle, G4Polyhedron, G4Polyline, G4Polymarker, G4Square.
   o modeling-V09-01-00: Adapted to new BeginPrimitives2D signature.
   o visman-V09-01-00: Implemented extended 2D interface.
   o opengl-V09-01-00: Implemented extended 2D interface.
   o vis-HepRep-V09-01-00: Adapted to new BeginPrimitives2D signature.
   o vistest-V09-01-00: MyEventAction: Added 2D polyhedron.
 
 19th November 2007 Joseph Perl  (vis-V09-00-03)
 - visman-V09-00-02: Replace references to Wired3 in command guidance
 - vis-HepRep-V09-00-01: Adjust geometry hierarchy for parallel worlds.
 - opengl-V09-00-04: Added GEANT4_QT_DEBUG flag to more places
 
 13th November 2007  John Allison  (vis-V09-00-02)
 - Removed OpenGL Qt files from tag.  File are still at head - need fixing.
 
 10th November 2007  John Allison  (vis-V09-00-01)
 - opengl-V09-00-01: Minor improvements in design and messaging.
 - modeling-V09-00-00: Minor improvements in messaging.
 - visman-V09-00-01:Minor improvement in messaging.
 
 10th July 2007  John Allison  (vis-V09-00-00)
 - visman-V09-00-00: Remove redundant method declarations and minor tidies.
 
 14th June 2007  John Allison  (vis-V08-03-07)
 - raytracer-V08-03-01: Fixed memory leak in G4RayTracer.
 
 30th May 2007  John Allison  (vis-V08-03-06)
 - modeling-V08-03-02: Fixed gcc-4.2.0 warning.
 
 30th May 2007  John Allison  (vis-V08-03-05)
 - modeling-V08-03-01: Fix for SUN.
 
 25th May 2007  John Allison  (vis-V08-03-04)
 - opengl-V08-03-03: Fixed gcc-4.1.2 compiler warnings.
 
 25th May 2007  John Allison  (vis-V08-03-03)
 - visman-V08-03-01: Improved error trapping and big fix.
 - opengl-V08-03-02: Improved error trapping.
 
 24th May 2007  John Allison  (vis-V08-03-02)
 - opengl-V08-03-01: Fixes for SUN.
 
 22nd May 2007  John Allison  (vis-V08-03-01)
 - modeling-V08-03-00: Simplified G4Atts for Physical Volume Path.
 - vis-HepRep-V08-03-00: Fixed memory leak in G4HepRepFile.
 - raytracer-V08-03-00: Fixed for dubious ValGrind diagnostic.
 
 16th May 2007  John Allison  (vis-V08-03-00)
 - visman-V08-03-00: Fix for Windows compiler.
 - opengl-V08-03-00: Fix compiler warnings and bug fixes in opengl-V08-02-06.
 
 8th May 2007  John Allison
 - opengl-V08-02-06: /vis/ogl/printEPS should work for all viewers.
 
 4th April 2007  John Allison  (vis-V08-02-04)
 - visman-V08-02-04: Bug fix for zero pointer in G4VscenHamdler::LoadAtts.
 - opengl-V08-02-05: Implemented picking for OGLSX (as well as OGLIX).
 
 3rd April 2007  John Allison  (vis-V08-02-03)
 - modeling-V08-02-02: Added further information on volume G4Atts.
 - visman-V08-02-03: Added /vis/viewer/set/picking.  Picking is "false"
   by default, except for Open Inventor.
 - opengl-V08-02-04:
   o Implemented picking for OGLIX.
   o Some reorganisation of display list construction to fix rare bug\
     in Display-by-Time feature
 - openinventor-V08-02-02: Picking is "true" by default for OI.
 
 25th March 2007  John Allison  (vis-V08-02-02)
 -  modeling-V08-02-01: Added solid dump and volume transformation to G4Atts.
 - visman-V08-02-02:
   o Removed G4GAGTree.
   o Removed /vis/scene/add/eventID (once again) from /vis/drawVolume.
 - opengl-V08-02-03: Fix compiler warnings.
 - vistree-V08-02-01: Removed GAGTree.
 - openinventor-V08-02-01): Added scale factor to list of changes
   requiring kernel visit, and some rationalisation.
 
 11th January 2007  John Allison  (vis-V08-02-01)
 - visman-V08-02-01:
   o Added /vis/abortReviewKeptEvents.
   o /vis/reviewKeptEvents: Improved guidance.
   o Bug fix: /vis/open in /vis/reviewKeptEvents loop.
   o Reduced WARNING noise.
 
 9th January 2007  John Allison
 - opengl-V08-02-01:
   o Implemented bitmap markers (for MarkerSizeType == screen).
   o Bug fix: Added missing break in X colormap lookup routine.
 
 5th January 2007  John Allison  (vis-V08-02-00 - needs greps-V08-02-00)
 - modeling-V08-02-00 (needs greps-V08-02-00):
   o Bug fix: Correct treatment of ForcedLineSegmentsPerCircle when clipping.
 - visman-V08-02-00:
   o G4VSceneHandler:
     ~ Introduced utility LoadAtts for G4AttValues and G4AttDefs.
     ~ Improved other utilities (changed signature of GetLineWidth).
   o Introduced /vis/geometry/set/forceLineSegmentsPerCircle.
   o Re-introduced /vis/scene/add/eventID into /vis/drawVolume (removed
     in visman-V08-01-16 for release 8.2).
   o Other minor improvements.
 - opengl-V08-02-00:
   o Followed change of signature of GetLineWidth in visman-V08-02-00.
 - openinventor-V08-02-00: Moved LoadAtts to vis management.
 - raytracer-V08-02-00: Bug fix: use of window size hints.
 - vistree-V08-02-00: Bug fix: Format of total mass.
 - vistest-V08-02-00: test19.cc: Refined usage.
 
 12th December 2006  Gabriele Cosmo
 - visman-V08-01-16: Commented command "vis/scene/add/eventID" forcing
   event ID to scene in G4VisCommandsCompound.cc.
 
 11th December 2006  John Allison
 - Tree: Trapped sequential G4PVPlacements.
 
 25th November 2006  John Allison  (vis-V08-01-17)
 - visman-V08-01-15: Follow change of behaviour of G4StateManager and
   minor message corrections.
 
 22nd November 2006  John Allison  (vis-V08-01-16)
 - visman-V08-01-14: Fixed /vis/reviewKeptEvents for "stored" viewers.
 
 21st November 2006  John Allison  (vis-V08-01-15)
 - visman-V08-01-13:
   o Fixed double drawing of event.
   o Restored old verbosity and printing interface (for obsolete user vis
     managers).
   o Fixed compiler warnings.
 - opengl-V08-01-09: Fixed compiler warnings.
 
 17th November 2006  Joseph Perl (vis-V08-01-14)
 - vis-HepRep-V08-01-04:
   o Omit Pos and Aux attributes for hits.
   o Protect against null Region (as in parallel geometries).
 - raytracer-V08-01-02
   o Deprecate /vis/rayTracer/backgroundColour.
 
 16th November 2006  John Allison
 - modeling-V08-01-15: More protection for parallel worlds.
 - visman-V08-01-12:
   o /vis/scene/notifyHandlers: Refreshes only auto-refresh viewers.
     (Warning of scene change issued for other viewers.)
 
 15th November 2006  John Allison  (vis-V08-01-13)
 - visman-V08-01-11: First implementation of /vis/reviewKeptEvents.
 
 14th November 2006  Joseph Perl
 - vis-HepRep-V08-01-03: Improve handling of Trajectory Points.
 
 14th November 2006  John Allison  (vis-V08-01-12)
 - modeling-V08-01-14: Merged modeling-V08-01-13-branch onto main branch:
   o Added G4Event pointer to modeling parameters.
 - visman-V08-01-10: Merged visman-V08-01-08-branch onto main branch:
   o Visualisation of parallel worlds.
   o Event refreshing (events are re-drawn on change or refresh of viewer).
 - raytracer-V08-01-01: Merged raytracer-V08-01-00-branch onto main branch:
   o Followed change to G4Scene.
 - vistest-V08-01-05: Added G4EllipticalCone.
 
 13 November 2006 Joseph Perl
 - vis-HepRep-V08-01-02: Corrected handling of Hits that come via AddSolids.
 
 5th November 2006  John Allison  (vis-V08-01-11)
 - modeling-V08-01-13: Further, hopefully, complete, protection against
   zero materials pointer.
 - vis-HepRep-V08-01-01, openinventor-V08-01-04, vistree-V08-01-02,
   visXXX-V08-01-06: Protected against zero material pointer.
 - visman-V08-01-09: Tidy warning messages.
 
 3rd November 2006  John Allison
 - modeling-V08-01-12: Protected against zero material pointer.
 
 -----------------------------------------------
 3rd November 2006  John Allison  (vis-V08-01-10)
 - Needs greps-V08-01-10 for bug fix in G4Visible.
 - Needs tracking-V08-01-05 for new storeTrajectory command.
 - Committed tracking-V08-01-05.  Now required by vis.
   o Augmented /tracking/storeTrajectory.  Now takes integer parameter:
     0 : Don't Store trajectories.
     !=0 : Store trajectories.
     1 : Choose G4Trajectory as default.
     2 : Choose G4SmoothTrajectory as default.
     3 : Choose G4RichTrajectory as default.
   o All trajectories:
     ~ Protect points container pointer in destructor.
     ~ Make G4AttDef descriptions more concise.
   o G4RichTrajectory:
     ~ Bug fix: Create G4AttValues for user-defined creator process.
   o G4VTrajectory: Improved ShowTrajectory.
 - visman-V08-01-08: Activated /vis/scene/add/trajectories with "rich" and
   "smooth".  Needs tracking-V08-01-05.
 - modeling-V08-01-11: Improved protections.
 - vistest-V08-01-04: Removed MyTrackingAction (use storeTrajectory instead.)
 
 2nd November 2006  John Allison
 - modeling-V08-01-10: G4HitsModel: Added GetCurrentHit.
 - openinventor-V08-01-03: Extended picking to hits.
 
 -------------------------------------------------------------------------
 1st November 2006  John Allison  (vis-V08-01-09; co-works greps-V08-01-09)
 - modeling-V08-01-09: Minor rationalisation.
 - visman-V08-01-07:
   o /vis/scene/add/trajectories: Allow string parameters "rich" and "smooth".
     (Not yet activated - awaiting tags in tracking.)
 - openinventor-V08-01-02:
   o Follow changes to greps-V08-01-09: G4AttCheck/Holder rationalisation.
 - vis-HepRep-V08-01-00: Minor rationalisation.
 - opengl-V08-01-08: Replace /vis/oglx/set/printEPS by /vis/oglx/printEPS.
 - vistree-V08-01-01: ASCIITree: Added printing of material name.
 - vistest-V08-01-03: Added G4Polycone and some G4Atts to an event action box.
 
 26th October 2006  John Allison
 - openinventor-V08-01-01:
   o Print G4AttValues of solids and trajectories on picking.
 - modeling-V08-01-08: Cosmetics.
 
 -------------------------------------------------------------------------
 24th October 2006  John Allison  (vis-V08-01-08; co-works greps-V08-01-08)
 - opengl-V08-01-07:
   o Calculate light front horizon properly.
   o Improve refresh behaviour for /vis/opengl commands.
 - visXXX-V08-01-04; co-works greps-V08-01-08:
   o Follow change to G4VisAttributes in greps-V08-01-08.
 
 -------------------------------------------------
 19th September 2006  John Allison  (vis-V08-01-07)
 - modeling-V08-01-07:
   o G4ModelingParameters: Added ExplodeCentre
   o Fix for Mac XCode 2.0 problem.
 - visman-V08-01-06:
   o G4ViewParameters: Added ExplodeCentre.
   o Bug fix in /vis/geometry/set/colour.
 - opengl-V08-01-06: Improved display-by-time feature.
 
 ---------------------------------------------------------------------------
 15th September 2006  John Allison  (vis-V08-01-06 - coworks greps-V08-01-04)
 - modeling-V08-01-06
   o Implemented explode factor(radial move) feature for top level drawn
     volumes.  John Allison
   o Add attribute based trajectory drawing & filtering, and attribute
     based hit filtering.  Jane Tinsley
 - visman-V08-01-05
   o Added /vis/viewer/clone and /vis/viewer/set/explodeFactor.  John Allison
   o Add attribute based trajectory drawing & filtering, and attribute
     based hit filtering.  Jane Tinsley
 
 13th September 2006  John Allison
 - visXXX-V08-01-03: Improved G4Att printing and checking.
 
 4th September 2006  John Allison
 - visman-V08-01-04: Added commands for cutaways.
 - opengl-V08-01-05: Implemented cutaways.
 
 ----------------------------------------------
 30th August 2006  John Allison  (vis-V08-01-05)
 - modeling-V08-01-05:
   o Implemented code for augmented /vis/scene/add/volume (subtraction
     *and* intersection of clipping volume).
   o Equipped for generic sectioning (DCUT) and cutaways.
   o Improved DrawWithTime.
 - visman-V08-01-03:
   o Added /vis/viewer/set/globalLineWidthScale.
   o Augmented /vis/scene/add/volume to include intersection of clipping volume.
   o Added G4VSceneHandler::CreateSection/CutawayPolyhedron to exploit generic
     sectioning (DCUT) and cutaways.  Currently not activated due to
     instabilities in BooleanProcessor.
 - opengl-V08-01-04:
   o Implemented line width.
   o Switched off back face culling when clipping so that the inside of
     volumes can be seen.
   o Added position and colour to /vis/ogl/set/displayHeadTime.
   o Added /vis/ogl/set/displayLightFront.
 
 29th August 2006  John Allison
 - openinventor-V08-01-00: Kernel visit rationalisation.
 - visXXX-V08-01-02: Minor tidying.
 
 -------------------------------------------------------------------------
 26th August 2006  John Allison  (vis-V08-01-04 - requires greps-V08-01-03)
 - modeling-V08-01-04:
   o Fixed compilation warning.
   o Follow G4VFilter const change.
 
 16th August 2006  John Allison
 - modeling-V08-01-03: Improved robustness of time slicing.
 
 ----------------------------------------------
 16th August 2006  John Allison  (vis-V08-01-03)
 - opengl-V08-01-03:
   o Fixed Solaris compilation problem.
   o Added /vis/ogl/set/fade and displayHeadTime.
 
 -----------------------------------------------
 14th August 2006  John Allison  (vis-V08-01-02)
 - modeling-V08-01-02: Added trajectory time slicing.
 - visman-V08-01-02: Friendship extended to new OpenGL messengers.
 - opengl-V08-01-02:
   o Implemented display-by-time.
   o Added /vis/ogl/set/startTime and endTime.
 - raytracer-V08-01-00: Improved robustness under vis manager control.
 - vistest-V08-01-02: Added MyTrackingAction - uses G4RichTrajectory.
 
 17th July 2006  John Allison
 - opengl-V08-01-01: Added /vis/oglx/set/printEPS.
 
 ---------------------------------------------
 10th July 2006  John Allison  (vis-V08-01-01)
 - Co-works with greps-V08-01-01.
 - modeling-V08-01-01:
   o Rationalised G4VModel and G4ModelingParameters.
   o G4PhysicalVolumeModel:
     ^ Removed Establish/DecommissionSpecials to conform with
       greps-V08-01-01.
     ^ Rationalised G4Atts: Added GetAttDefs/CreateAttValues.
 - visman-V08-01-01:
   o Removed Establish/DecommissionSpecials to conform with greps-V08-01-01.
   o Respect rationalised G4ModelingParameters.
   o Added GetNoOfSides that respects forced line segments per circle.
 - G4VisCommandsScene.cc: Spelling correction.
 - DAWN-V08-01-00: Respects forced line segments per circle.
 - visXXX-V08-01-01: Gets solid's G4Atts created by G4PhysicalVolumeModel.
 - vistest-V08-01-01: SetForceLineSegmentsPerCircle(100) for G4Sphere.
 
 --------------------------------------------------------------------
 3rd July 2006  John Allison  (vis-V08-01-00 - needs greps-V08-01-00)
 - modeling-V08-01-00: Added G4Atts for solids.  (Needs greps-V08-01-00.)
 - visman-V08-01-00:
   o /vis/scene/transientsAction: Added max number of events parameter.
   o Added /vis/viewer/clearTransients.
   o Improved /vis/list.
   o (Commented out) code for event copying.
 - opengl-V08-01-00:
   o Eliminated redundant variable, doublebuffer.
   o Implemented FinishView in all viewers.
 - vistree-V08-01-00: ASCIITree: Layout improvement.
 - visXXX-V08-01-00: General tidy and improvement to XXXFile.
 - vistest-V08-01-00: Protect against zero run manager pointer.
 
 ---------------------------------------------
 12th June 2006  John Allison  (vis-V08-00-13)
 - DAWN-V08-00-04: Fixed rewind and file closure on exit.
 - VRML-V08-00-02: Fixed rewind and file closure on exit.
 
 ------------------------------------------
 8th June 2006 John Allison (vis-V08-00-12)
 - visman-V08-00-23: Fixed bug in /vis/scene/endOfRunAction.
 
 -------------------------------------------
 7th June 2006  John Allison (vis-V08-00-11)
 - modeling-V08-00-14: Added protection for zero vis atts.
 - visman-V08-00-22: Zeroed modeling parameters pointer after use.
 
 -------------------------------------------
 6th June 2006  John Allison (vis-V08-00-10)
 - modeling-V08-00-13: Fixes for Sun and bug fix in G4PhysicalVolumeModel.
 - visman-V08-00-21: /vis/viewer/create: Fixed view params copy to self.
 
 ------------------------------------------
 4th June 2005  Joseph Perl (vis-V08-00-09)
 - Global tag for Geant4 release 8.1
 - Corresponds to the following subdirectory tags:
 - DAWN-V08-00-03
 - vis-HepRep-V08-00-04
 - visman-V08-00-20
 - modeling-V08-00-12
 - opengl-V08-00-08
 - openinventor-V08-00-05
 - raytracer-V08-00-04
 - vistest-V08-00-08
 - vistree-V08-00-04
 - VRML-V08-00-01
 - visXXX-V08-00-04
 
 2nd June 2006  Joseph Perl
 - vis-HepRep-V08-00-03: Improvements to HepRepFile.
 
 2nd June 2006  John Allison
 - DAWN-V08-00-03: Handle file closing in DAWNFILE destructor.
 - VRML-V08-00-01: Protect zero model pointer.
 
 30th May 2006  Joseph Perl
 - opengl-V08-00-08: Fixed buffering problem in Win32.
 
 --------------------------------------------
 25th May 2006  John Allison  (vis-V08-00-08)
 - visman-V08-00-19:
   o Changed re-computation of transients default to "off".
   o Indent printing of models plus other minor improvements.
 - modeling-V08-00-11: Indent printing of models, fix trivial compiler warnings.
 - vistest-V08-00-07: Removed standalone - moved to
   examples/extended/visualization.
 
 22nd May 2006  John Allison
 - modeling-V08-00-10:
   o Remove dependency on Run.
   o Protect zero pointer in output of G4ModelingParameters.
 - visman-V08-00-18:
   o Remove G4Scene:Clear().  (Not used.)
   o Require Idle state for transient re-computation.
   o Reduce dependency on Run.  (Still used for transient re-computation.)
   o /vis/.../list commands: Default verbosity changed to "warnings".
 - vis-HepRep-V08-00-02: Remove dependency on Run.
 
 --------------------------------------------
 12th May 2006  John Allison  (vis-V08-00-07)
 - Needs run-V08-00-02 and event-V08-00-03.
 - Main features:
   o Protect against non-instantiation of run manager.
   o Final refinements for re-computation of transients.
   o G4OpenGLWin32Viewer: Fixed buffer swapping behaviour.
 - visman-V08-00-16:
   o Added /vis/list and /vis/scene/add/eventID.
   o Final refinements for event/run reprocessing (re-computation of
     transients).
 - modeling-V08-00-09:
   o Removed dependency on G4RunManager.
   o G4CallbackModel: Added G4VGraphicsScene argument to operator().
 - opengl-V08-00-06: G4OpenGLWin32Viewer: Fixed buffer swapping behaviour.
 - raytracer-V08-00-04: SetRecomputeTransients(false).
 - raytracer-V08-00-03: Moved G4RayShooter class to Event category.
 - vistest-V08-00-06: Uses /vis/scene/add/eventID.
 
 ----------------------------------------------
 21st April 2006  John Allison  (vis-V08-00-06)
 - Main features:
   o Improved protection for null models and parameters.
   o Improved trajectory drawing.
   o Improved re-computation of transients in OpenGL.
 - modeling-V08-00-08:
   o Improved protection for null models and parameters.
   o Add context to trajectory drawers.
   o Add generic drawer, G4TrajectoryGenericDrawer.
 - visman-V08-00-15: Improved protection for null models and parameters.
 - DAWN-V08-00-02: Improved protection for null models and parameters.
 - vis-HepRep-V08-00-01: Improved protection for null models and parameters.
 - raytracer-V08-00-02):
   o Relies on improved protection for null models and parameters.
 - vistree-V08-00-04: Improved protection for null models and parameters.
 - visXXX-V08-00-04: Improved protection for null models and parameters.
 - vistest-V08-00-05: Tidied.
 
 28th April 2006  John Allison
 - Co-working tags:
   o opengl-V08-00-05: Fixes re-computation of transients in stored viewers.
   o visman-V08-00-14: Includes changes that improve behaviour of
     double buffered and interactive viewers when recomputing
     transients.
 
 ----------------------------------------------
 24th April 2006  John Allison  (vis-V08-00-05)
 - visman-V08-00-13:
   o Fix bug #861.
   o Print available models on initialisation.
 - modeling-V08-00-07:
   o Add Print method to G4VModelFactory.
   o Fix warnings on Linux.
 - opengl-V08-00-04: Fixed compilation problem on Windows.
 
 ---------------------------------------------------------------------
 19th April 2006  John Allison (vis-V08-00-04 - needs greps-V08-00-02)
 - Main features:
   o Implementation of 2D text in base classes and concrete implementation
     of same in OpenGL.
   o Continued migration to direct access to G4PhysicalVolumeModel.
   o Addition of Trajectory Filter Models (Jane Tinslay).
 - visman-V08-00-12 (needs greps-V08-00-02):
   o Implemented Draw2D(const G4Text&).
   o Implemented Begin/EndPrimitives2D.
   o Migrated to direct access to G4PhysicalVolumeModel.
   o Introduced G4VisFilterManager.hh to manager filtering
 - modeling-V08-00-06:
   o Upgrade to greps-V08-00-02 and minor improvements.
   o Added G4TrajectoryFilterFactories and G4TrajectoryParticleFilter
 - DAWN-V08-00-01: Migrated to direct access to G4PhysicalVolumeModel.
 - vis-HepRep-V08-00-00: Migrated to direct access to G4PhysicalVolumeModel.
 - opengl-V08-00-03:
   o Implemented Begin/EndPrimitives2D.
   o Migrated to direct access to G4PhysicalVolumeModel.
 - vistree-V08-00-03:
   o G4GAGTreeSceneHandler: Migration to direct access to G4PhysicalVolumeModel.
 - visXXX-V08-00-03: Improvement of legibility.
 - openinventor-V08-00-04: Use cmath instead of math.h.
 - vistest-V08-00-04: Added drawing of 2D text.
 
 ----------------------------------------------
 28th March 2006  John Allison  (vis-V08-00-03)
 - visman-V08-00-11:
   o Introduces trajectory drawing manager.
   o G4VisExecutive: Adds G4TrajectoryDrawByOriginVolumeFactory.
   o Corrects logic of transients re-computation:
   o Unifies treatment of bools in commands.
 - modeling-V08-00-05:
   o Introduces G4TrajectoryDrawByOriginVolume.
   o Part migration away from EstablishSpecials mechanism.
 - vistree-V08-00-02 (needs modeling-V08-00-05):
   o Made compatible with modeling-V08-00-05.
   o Migration away from EstablishSpecials mechanism.
 - openinventor-V08-00-03: Much improvement in logic.
 - visXXX-V08-00-02: Added G4XXXFile, G4XXXStored, G4XXXSG.
 - vistest-V08-00-03: Modernised and improved.
 
 ----------------------------------------------
 14th March 2006  John Allison  (vis-V08-00-02)
 - opengl-V08-00-02: Refinement of display list handling.
 - vistree-V08-00-01: G4VTree and G4ASCIITree: Minor improvements to
   readability of code.
 - modeling-V08-00-04: Added output operator<< for PVNodeID.
 
 13th March 2006  John Allison
 - visman-V08-00-10: Fixes recomputation of transients when changing drivers.
 
 ---------------------------------------------
 8th March 2006  John Allison  (vis-V08-00-01)
 - visman-V08-00-09: Small bug fix to vis-V08-00-00.
 
 6th March 2006  John Allison  (vis-V08-00-00)
 - Collected tags below.  Main features since Release 8.0:
   o Added /vis/scene/transientsAction.  The default is "rerun", i.e.,
     when the viewer requests, the previous event or run will be
     processed again with the original random number seed so that
     transients (trajectories, hits, user drawing, etc.) are
     reconstructed.  Thus, transients are "remembered" and may be
     copied between graphics systems.  Turn off with
     "/vis/scene/transientsAction none".
   o Introduced /vis/geometry/... for editing vis attributes of
     geometry volumes.
   o For developers:
     * Migration from use of Establish/DecommisionSpecials.
     * Drawn path available.
 
 6th March 2006  John Allison
 - visman-V08-00-08: Added /vis/scene/transientsAction.
 
 3rd March 2006  John Allison
 - vistest-V08-00-02: Added test of transient handling.
 
 16th February 2006  John Allison
 - modeling-V08-00-03: For future removal of Establish/DecommisionSpecials.
 
 9th February 2006  John Allison
 - visman-V08-00-07: First implementation of refresh end-of-event.
 
 8th February 2006  John Allison
 - modeling-V08-00-02: Added DrawingStyle to G4ModelingParameters and fixed
   bug in culling of covered daughters
 - visman-V08-00-06 (needs modeling-V08-00-02): Made use of
   G4ModelingParameters::DrawingStyle.
 - vistree-V08-00-00: Fixed bug in treatment of repeated replicas.
 - visXXX-V08-00-01: Improved handling of DrawnPVPath.
 
 3rd February 2006  John Allison
 - visman-V08-00-05: Introduced /vis/geometry/...
 
 30th January 2006  John Allison
 - openinventor-V08-00-01: Implemented drawn volume path.
 
 26th January 2006  John Allison
 - raytracer-V08-00-01: Minor improvements.
 - vistest-V08-00-01: Improved ray tracer; commented about voxelisation crash.
 - modeling-V08-00-01: G4PhysicalVolumeModel: Added drawn volume path
   capability.
 - visXXX-V08-00-00: Uses drawn volume path.  Needs modeling-V08-00-01
   and visman-V08-00-04.
 - 3 co-working tags due to removal of fModified:
   o visman-V08-00-04: Removed fModified plus minor improvements.
   o opengl-V08-00-01: Removed fModified plus tidying.
   o openinventor-V08-00-00: Removed fModified.
 
 ----------------------------------------------------------------------
 The tags below since Release 8.0 were collected in geant4-08-00-ref-01
 and geant4-08-00-ref-02.
 
 23rd January 2006  John Allison
 - DAWN-V08-00-00: Rewind output file in ClearView.  Avoids duplicate
   geometries in output file.
 - VRML-V08-00-00: As above.
 
 11th January 2006  John Allison
 - vistest-V08-00-00: Added twisted solids and improved Perspective example.
 - visman-V08-00-02: Minor improvements.
 - raytracer-V08-00-00: Reorganisation (needs visman-V08-00-02).
 - opengl-V08-00-00: Improved efficiency; made G4OpenGLXmViewerMessenger smart.
 - modeling-V08-00-00: Changed last remaining G4Transform3D::Identity to
   G4Transform3D().
 
 9th January 2006  John Allison
 - visman-V08-00-00: geant4-08-00-ref-00 + reversal of change of 22nd
   November 2005: fMarkForClearingTransientStore(true) initially now.
 - visman-V08-00-01: Improved /vis/scene/notifyHandlers, improved warning
   messages and some bug fixes, including visman-V08-00-00.
 
 ----------------------------------------------
 4th December 2005  Joseph Perl (vis-V07-01-10)
 - Global tag for Geant4 release 8.0
 - Corresponds to the following subdirectory tags:
 - externals: geant4-07-01-ref-05
 - FukuiRenderer: geant4-07-01-ref-05
 - HepRep: geant4-07-01-ref-05
 - management: visman-V07-01-10
 - modeling: modeling-V07-01-07
 - OpenGL: opengl-V07-01-09
 - OpenInventor: openinventor-V07-01-04
 - RayTracer: raytracer-V07-01-08
 - test: vistest-V07-01-04
 - Tree: vistree-V07-01-01
 - VRML: geant4-07-01-ref-05
 - XXX: visXXX-V07-01-02
 
 29th November 2005  Jane Tinslay (vis-V07-01-09)
 - Make G4VisManager::RegisterModelFactories() non-pure for
   backwards compatibility.
 - Add information message to G4VisManager::DispatchToModel
   when default trajectory model is used.
 - Removed names of unused paramaters to stop compiler warnings:
   G4VModelCommand.hh, G4ModelCommandsDrawByCharge.cc,
   G4ModelCommandsDrawByParticleID.cc, G4VRTScanner.hh
 
 25th November 2005  Joseph Perl (vis-V07-01-08)
 - Global tag for Geant4 release 8.0
 - Corresponds to the following subdirectory tags:
 - externals: geant4-07-01-ref-05
 - FukuiRenderer: geant4-07-01-ref-05
 - HepRep: geant4-07-01-ref-05
 - management: visman-V07-01-09
 - modeling: modeling-V07-01-05
 - OpenGL: opengl-V07-01-09
 - OpenInventor: openinventor-V07-01-03
 - RayTracer: raytracer-V07-01-06
 - test: vistest-V07-01-04
 - Tree: vistree-V07-01-01
 - VRML: geant4-07-01-ref-05
 - XXX: visXXX-V07-01-02
 
 22nd November 2005  John Allison
 - vistest-V07-01-04: Added G4Tet and PerspectiveVisAction. Refined G4Polyhedra.
 - opengl-V07-01-08: Added G4OpenGLXmViewerMessenger. Corrected text position.
 - vistree-V07-01-01: Refined guidance and printing.
 - visXXX-V07-01-02: Simplified guidance.
 - modeling-V07-01-03: Implemented radial replicas for G4Tubs.
 
 18th November 2005  John Allison
 - raytracer-V07-01-06: merged developments to the head, including RayTracerX.
 
 18th November 2005  Joseph Perl  (vis-V07-01-07)
 - Minor modification of geant4-07-01-ref-05 to facilitate acceptance
   of greps-V07-01-09 and tracking tracking-V07-01-02.  As with
   vis-V07-01-06, it should subsequently simply be ignored.
 
 15th November 2005  Guy Barrand
 - openinventor-V07-01-03: Background, scaling and window positioning.  Also
   reading and wroting of .iv files.
 
 14th November 2005  John Allison (vis-V07-01-06)
 - Minor modification of vis-V07-01-03 + vis-HepRep-V07-01-04 (to avoid
   warnings on Sun), i.e., it excludes all development since then. This
   tag is purely to facilitate acceptance of greps-V07-01-09.  To
   achieve this, the modification was made on a branch -
   vis-V07-01-03-branch - of just one file, namely G4VisManager.hh.
   This should subsequently simply be ignored.
 
 13th November 2005  John Allison
 - visman-V07-01-08: Added XGeometryString and background opacity parameter.
 - opengl-V07-01-07: Implemented window placing (XGeometryString) in OGL*X.
 
 24th October 2005  John Allison
 - modeling-V07-01-02: Added trajectory models.
 - visman-V07-01-07: Added methods for managing trajectory models.
 
 20th October 2005  Joseph Perl (vis-V07-01-05)
 - New Global Vis Tag.
 - Includes head of everything except RayTracer and OpenInventor.
 - Requires geant4-07-01-ref-03 plus the following:
 - graphics_reps: greps-V07-01-06
 - intercoms: intercoms-V07-01-01
 - event: event-V07-01-0
 - run: run-V07-01-02
 
 13th October 2005  John Allison (vis-V07-01-04)
 - Implemented non-uniform scaling in management and OpenGL.
 - Implemented arbitrary background in management, OpenGL and RayTracer.
 - Migrated to <sstream>.
 - The above consists of:
   o vistest-V07-01-03: Migrated to <sstream> plus minor changes.
   o DAWN-V07-01-00: Migrated to <sstream>.
   o vis-HepRep-V07-01-03: Migrated to <sstream>.
   o opengl-V07-01-06: Migrated to <sstream>, non-uniform scaling, any
     background.
   o vistree-V07-01-00: Migrated to <sstream>, fixed bug in mass calculations.
   o visXXX-V07-01-01: Migrated to <sstream>.
   o modeling-V07-01-01: Migrated to <sstream>.
   o visman-V07-01-05: Migrated to <sstream>, non-uniform scaling, any
     background.
 
 12th October 2005  John Allison (vis-V07-01-03)
 - G4VisCommandsViewer.cc: Trapped zero viewer pointer in /vis/viewer/update
   (bug found by system test of vis-V07-01-02).
 
 2nd Oct 2005  Joseph Perl (vis-V07-01-02)
   Same as vis-V07-01-01 but with earlier raytracer tag:
   raytracer-V07-01-02
 
 30th Sep 2005  Joseph Perl (vis-V07-01-01)
   New global tag for Vis.  Corresponds to vis-V07-01-00 plus:
   vistest-V07-01-02
   visman-V07-01-04
   raytracer-V07-01-03
   modeling-V07-01-00
   opengl-V07-01-05
   openinventor-V07-01-02
   visXXX-V07-01-00
   vis-HepRep-V07-01-01
 
 30th September 2005  Joseph Perl (raytracer-V07-01-03)
 New tag to include change Makoto made an hour after V07-01-02 was tagged.
 Change seems to just involve passing pWorld to material list where no argument was passed in previous version.
 
 29th September 2005  John Allison  (opengl-V07-01-05)
 - Added G4OpenGLViewerDataStore to facilitate access of viewer data by
   scene handler.
 - Re-implemented transparency button in OpenGLXm.
 
 New tags to be included 16th Sep 2005 (JA):
   o visman-V07-01-03:
     + Issue "/tracking/storeTrajectory 1" on /vis/scene/add/trajectories.
     + Warning: Attempt to add volume to a scene already containing the world.
     + Error: Logical volume model must be only volume model in scene.
   o visman-V07-01-04: Simplified use of ConcreteInstance..
   o raytracer-V07-01-02: Bug fix (black holes).
   o vistest-V07-01-02: Added a G4AttValue with time.
 
 To be included:
   o visman-V07-01-01: Introduced (optional) second pass over scene.
   o visman-V07-01-02: Added /vis/viewer/set/whiteBackground.
                       Added RayTracerX to G4VisExecutive.
   o modeling-V07-01-00: Fixed (non-)culling of transparent volumes.
   o opengl-V07-01-01: Half-way implementation of transparency.
   o opengl-V07-01-02: "Better algorithm" for transparency.
   o opengl-V07-01-03: Bug fix.
   o opengl-V07-01-04: Fixed hidden line removal.
   o vis-HepRep-V07-01-00 (4 August 2005 Mark Donszelmann)
   o openinventor-V07-01-01 (1st August 2005  Gabriele Cosmo)
   o openinventor-V07-01-02: Corrected treatment of edgeflags.
   o raytracer-V07-01-01: Protected RayTracerX by G4VIS macro.
   o visXXX-V07-01-00: Improved guidance for rendering polyhedron objects.
   o vistest-V07-01-01: RayTracerX instantiation removed - now in
                        G4VisExecutive.
 
 20th July 2005  John Allison (vis-V07-01-00)
 - opengl-V07-01-00: Introduced smooth shading.  Also window size hints for Xm.
 - openinventor-V07-01-00: Changed Geant4_SoPolyhedron to construct
     from G4Polyhedron.  Functionality unchanged.
 - visman-V07-01-00: Protected new viewer pointer.
 - vistest-V07-01-00
 - Removed top level README files.  (All wisdom now transferred
     properly to User Guides.)
 
 17th July 2005  John Allison
 - raytracer-V07-01-00: Introduced RayTracerX.
 
 7th June 2005  John Allison (vis-V07-00-19)
 - visXXX-V07-00-00: Fixed compiler warnings.
 - visman-V07-00-02: bug fix.
 - modeling-V07-00-02: bug fix.
 - Incorporates vis-gmk-V07-00-00 - a fix for addition of zlib to
   SUBLIBS and SUBDIRS (Gabriele)
 
 2nd June 2005  Joseph Perl (vis-V07-00-18)
 - Candidate tag for release.
 - Includes Mark's additional changes for HepRep2.
 - Includes Mark's fix for gcc-4.0 compilation.
 
 2nd June 2005  Joseph Perl (vis-V07-00-17)
 - Candidate tag for release.  May or may not be final.
 - Undid Gabriele's fix to G4HepRepFileSceneHandler.cc.
 
 2nd June 2005  John Allison
 - Removed scene handler count and made small cosmetic improvements.
 
 2nd June 2005  Joseph Perl (vis-V07-00-16)
 - Incorporate improvements to HepRepFile and HepRepXML
 
 30th May 2005  John Allison  (vis-V07-00-15)
 - opengl-V07-00-03: Fixed compilation problem in OpenGL on SUN.
 - HepRepFile: Fixed bug introduced in ClearTransientStore. (Joseph Perl)
 
 27th May 2005  John Allison
 - DAWN-V07-00-00, VRML-V07-00-00:
     Fixed bug introduced in ClearTransientStore.
 - openinventor-V07-00-00 and 01:
     fixes for CLHEP and marker sizes.
 - vis-HepRep-V07-00-01 and vis-zlib-V07-00-00  (Mark Donszelmann)
     Migration to G4LIB_BUILD_ZLIB and some developments.
 - management:
   o Reduced text size of scale annotation to 12 pixels.
   o Fixed default values in /vis/scene/add/text.
 
 12th May 2005  John Allison
 - Moved zlib to externals/zlib.
 
 6th May 2005  John Allison  (vis-V07-00-14)
 - OpenGL: fixed bug (views not refreshed - opengl-V07-00-02).
 - Improved ASSCIITree guidance.
 - G4VisExecutive: Replaced printing of available graphics systems.
   Now corresponds to behaviour of most old examples vis managers.
 - Fixed some pedantic warnings from gcc 4.
 - G4PhysicalVolumeModel: SetCopyNo of replicas and paramaterised
   volumes (modeling-V07-00-00).
 
 5th May 2005  John Allison
 - Introduced zlib directory.
 
 22nd April 2005  John Allison
 - OpenGL: Implemented text for X-Windows viewers (opengl-V07-00-00/1).
 
 10th April 2005  John Allison  (visman-V07-00-00)
 - G4VisCommandsSceneAdd.cc: 2nd attempt to fix access to fpVisManager
   from nested class for SUN.
 
 16th March 2005  John Allison  (vis-V07-00-13)
 - G4VisCommandsSceneAdd.cc: fixed access to fpVisManager from nested class.
 - For gcc 2.95.2: Fixed G4String return for viewer commands.
 - Added constructor and virtual destructor to G4VUserVisAction.
 
 15th March 2005  John Allison  (vis-V07-00-12)
 - Added return type G4int to G4ViewParameters::SetNoOfSides and
   G4ModelingParameters::SetNoOfSides.  They return no. of sides, i.e.,
   sides per circle in polyhedron contruction, that are actually set;
   there is a lower limit of 12.
 - G4PhysicalVolumeModel: bug fix: no. of rotation steps correctly applied.
 
 10th March 2005  John Allison  (vis-V07-00-11)
 - Reviewed all vis commands.  Improved guidance, simplified and
   rationalised the commands.
 
 9th March 2005  John Allison
 - Removed "remove" and "edit" commands.
 - G4VisManager: removed "Delete" methods. (Removing or deleting an
   existing scene, scene handler or viewer is very messy and not
   necessary.  When a user creates a new one, he/she may leave the old
   one around without harm.  It may be left unused or selected again later
   if the user wants.)
 - Removed automatic parameter candidate specification for commands
   that take an argument that is a scene, scene handler or viewer
   name - it is checked in SetNewValue methods.  (The code was just
   too complicated and, anyway, the result hindered, rather than
   helped the user, because it restricted the parameter values and
   mis-typing gave obscure messages.  Now the messages are clearer and,
   as the guidance points out, the list of possible names can be
   obtained with a "list" command.)
 - Made "list" commands flag current items.
 - Improved guidance for /vis/scene commands.  Still to do (groan!):
     /vis/scene/add
     /vis/sceneHandler
     /vis/viewer
 
 9th March 2005  John Allison  (vis-V07-00-10, needs greps-V07-00-01)
 - Refined logo and scale.
 - Improved physical volume clipping.
 - G4VisManager: Added default G4Transform3D::Identity to
   objectTransformation argument in Draw methods.
 
 4th March 2005  John Allison  (vis-V07-00-09)
 - Added first implementation of cutaway - a clipping box for physical
   volume tree:
     vis/scene/add/volume ! ! ! box km 0 1 0 1 0 1
   (Does not seem properly to clip volumes wholly inside clipping volume.)
 
 3rd March 2005  John Allison  (vis-V07-00-08)
 - Introduced /vis/scene/add/logo.
 - Added Set methods to G4VModel.
 - Added argument to G4CallbackModel::operator()(const G4Transform3D&) so that
   the model could implement a given transformation.  Provided default for
   G4VUserVisAction::(const G4Transform3D& = G4Transform3D::Identity).
 - Improved guidance for:
     compound commands
     ASCIITree commands
 - Used std::istrstream::istrstream(std::string) throughout.
 
 23rd February 2005  John Allison  (vis-V07-00-07)
 - Protected scene handlers for the case of the drawing of solids NOT
   from a physical volume tree:
     G4FRSceneFunc.icc
     G4OpenGLSceneHandler.cc
     G4OpenGLStoredSceneHandler.cc
     G4ASCIITreeSceneHandler.cc
     G4GAGTreeSceneHandler.cc
 - Fixed a problem with ClearTransientStore.  ClearTransientStore
   should restrict itself to its job.  In the following files,
   ClearTransientStore also redraws the view.  In other places, a draw
   command often follows, so it is not needed here.  In fact it can
   cause a double recursive descent into DrawView, so the existing code
   has been commented out (JA - 23/Jan/05):
     G4FRSceneFunc.icc
     G4HepRepFileSceneHandler.cc
     G4OpenGLImmediateSceneHandler.cc
     G4OpenGLStoredSceneHandler.cc
     G4VRML1SceneHandlerFunc.icc
     G4VRML2SceneHandlerFunc.icc
     G4XXXSceneHandler.cc
 - Removed (commented out) some code that forced extra kernel visits,
   purportedly to overcome a problem in OpenGLStored methods.  Let's
   fix OpenGL if necessary:
     G4VSceneHandler.cc
     G4VViewer.cc
 - Commented out SetView and ClearView in /vis/viewer/refresh:
     G4VisCommandsViewer.cc
 - Changed signature of G4VViewer::SetNeedKernelVisit(G4bool) for compatibility.
 
 19th February 2005  John Allison  (vis-V07-00-06 with greps-V07-00-00)
 - Added G4VUserVisAction and G4CallbackModel.
 - Implemented /vis/scene/add/userAction.
 - Fixed bug in /vis/viewer/update (check existence of scene handler and scene).
 
 15th February 2005  John Allison  (vis-V07-00-05)
 - Introduced drawing of readout geometry for logical volumes.
 - For drawing of logical volumes, introduced boolean flags to control
   drawing of:
     o boolean components (if any)
     o voxels (if any) (note: voxels are not created until start of run)
     o readout geometry (if any)
 - Augmented commands /vis/specify and /vis/scene/add/logicalVolume to use
   above flags.
 - G4ASCIITree: Added printing of names of sensitive detector (if any) and
   readout geometry (if any).
 
 15th February 2005  John Allison  (vis-V07-00-04)
 - Updated READMEs for G4VisExecutive.  Removed references to OPACS.
 
 9th February 2005  John Allison  (vis-V07-00-03)
 - Migration from AddThis to AddSolid and AddCompound: fixed previously
   missed FukuiRendererSceneHander.
 
 4th February 2005  John Allison  (vis-V07-00-02)
 - Introduced G4VisExecutive.  MyVisManager deprecated.
 
 27th January 2005  John Allison  (vis-V07-00-01, needs intercoms-V07-00-00)
 - Migration from AddThis to AddSolid and AddCompound.
 - AddSolid: Methods for adding solids to the scene handler.  They
   must always be called in the triplet PreAddSolid, AddSolid and
   PostAddSolid.  The transformation and visualization attributes
   must be set by the call to PreAddSolid.  A possible default
   implementation is to request the solid to provide a G4Polyhedron
   or similar primitive - see, for example, G4VSceneHandler.
 - AddCompound: Methods for adding "compound" GEANT4 objects to the scene
   handler.  These methods may either (a) invoke "user code" that
   uses the "user interface", G4VVisManager (see, for example,
   G4VSceneHandler in the Visualization Category, which for
   trajectories uses G4VTrajectory::DrawTrajectory, via
   G4TrajectoriesModel in the Modeling Category) or (b) invoke
   AddPrimitives below (between calls to Begin/EndPrimitives) or (c)
   use graphics-system-specific code or (d) any combination of the
   above.
 
 26th January 2005  John Allison  (vis-V07-00-00)
 - G4VisManager:: removed optional argument
   const G4Transform3D& objectTransformation = G4Transform3D::Identity
   from Draw methods for a hit and trajectory.
 - Trapped illegal nesting of Begin/EndPrimitives.
 - Added fpCurrentMaterial to G4VSceneHandler and relevant derived
   classes and models for work with G4PhysicalVolumeModel via
   EstablishSpecials.  So now, the material is also available (in addition
   to current depth, logical and physical volum) during drawing of geometry
   items.
 - Changed ASCIITree to use G4VSolid::GetCubicVolume and
   G4LogicalVolume::GetMass.
 - Changed G4PhysicalVolumeMassScene to use G4VSolid::GetCubicVolume.
 - Improved guidance for /vis/viewer/set/hiddenMarker.
 - G4VisCommandsViewerSet: made Up and Viewpoint vectors unit for safety.
 - Some additions to test area.
 
 10th December 2004 Gabriele Cosmo (vis-V06-02-09)
 - Replaced M_PI with CLHEP's pi.
 
 7th December 2004 Joseph Perl (vis-V06-02-08)
 - Tagged right after migration to cmath
 - All occurrences of include <math.h> have now become include <cmath>.
 - All math functions are now prefaced with std::
 
 7th December 2004 Joseph Perl (vis-V06-02-07)
 - Tagged right before migration to cmath
 
 26th November 2004 Joseph Perl (vis-V06-02-06)
 - Tagged for release 7.0.
 - Made from vis-V06-02-05
 - plus opengl-V06-02-07 by John Allison
 - plus vis-HepRep-V06-02-02 by Mark Donszelmann
 - plus openinventor-V07-00-00 by Guy Barrand
 
 18th November 2004  John Allison
 - Included opengl-V06-02-07.
 
 11th November 2004  John Allison  (vis-V06-02-05)
 - Made use of smart method GetPolyhedron for solids.  This greatly
   speeds 2nd and subsequent drawings when kernel access is required.
 - Rationalised use of EstablishSpecials: functionality moved to base class.
 - Removed use of obsolete G4Polymarker::line.
 
 22nd September 2004  John Allison  (vis-V06-02-04)
 - Moved Doxyfile to management.  doxygen output to tmp area.
 - modeling-V06-02-01 - small fixes.
 - vistree-V06-02-01 - small fixes.
 - opengl-V06-02-06 - Trap non-regular polyhedra and other small changes.
 - DAWN-V06-02-00 - Improve diagnostic on trapping non-regular polyhedra.
 - vistest-V06-02-02: refined rotated tube test.
 
 13th September 2004  John Allison  (vis-V06-02-03)
 - vistree-V06-02-00: Improved ASCIITree:
   verbosity >= 3: prints volume, density of all volumes in hierarchy.
   verbosity >= 4: calculates the mass of the complete geometry tree taking
     into account daughters up to the depth specified for each physical
     volume in the current scene.  Culling is ignored so that all volumes
     are processed.  The calculation is quite tricky, since it involves
     subtracting the mass of that part of the mother that is occupied by
     each daughter and then adding the mass of the daughter, and so on
     down the heirarchy.  Uses G4PhysicalVolumeMassScene - see below.
   Added option to write to file (/vis/ASCIITree/set/outFile).
 - modeling-V06-02-00: Added G4PhysicalVolumeMassScene and improvements
   to G4PhysicalVolumeModel.  See modeling/History for more details.
 - Removed obsolete file: G4VisToOldVisCommands.hh
 - Corrected mistake in /vis/viewer/set/*Vector commands.
 - Augmented ParameterisedBox and rotated a tracker tube in test directory.
 - Brought README.built_in_commands up to date for Geant4 6.2.  Removed all
   references to old commands.'
 
 3rd August 2004  John Allison
 - Rationalised vis command code (uses G4UIcommand static conversion
   functions where possible).
 - Removed G4ViewParameters::DrawingStyle GetDrawingStyle (const
   G4Visible&).  Instead, developer has to:
     // Get vis attributes - pick up defaults if none.
     const G4VisAttributes* pVA =
       fpViewer -> GetApplicableVisAttributes (v.GetVisAttributes ());
   where v is the visible object (polyline, circle, polyhedron, etc.), and:
     // Get view parameters that the user can force through the vis
     // attributes, thereby over-riding the current view parameter.
     G4ViewParameters::DrawingStyle drawing_style = GetDrawingStyle (pVA);
     G4bool isAuxEdgeVisible = GetAuxEdgeVisible (pVA);
   Most developers do this anyway, so the removed routine was redundant
   and resulting code is more efficient and transparent.  To get
   colour, the developer can pick up directly from the vis attrributes,
   pVA, obtained as above:
     const G4Colour& c = pVA -> GetColour ();
   or use a slightly less efficient method:
     const G4Colour& c = GetColour (v);
   where v is the visible object.
   Note that for text, the developer must use a different procedure,
   since the default text colour is determined by the default text vis
   attributes, which may be specified independent of default vis
   attributes of other types of visible objects.  A function,
   GetTextColour, is provided and the recommended use is:
     const G4Colour& c = GetTextColour (text);  // Picks up default if none.
 - Rationalised use of vis attributes in OpenGL and XXX.
 
 28th July 2004  John Allison  (vis-V06-02-02 with greps-V06-02-00)
 - Implemented force auxiliary edge visible feature of G4VisAttributes.
 - Included openinventor-V06-02-00 (minor revision - Guy Barrand).
 
 23rd July 2004  John Allison
 - Added auxiliary edge visible flag to G4ViewParameters and a new
   command, /vis/viewer/set/auxiliaryEdge.  (Auxiliary edges are not
   genuine edges of the volume.  They may be in a curved surface made
   out of polygons, for example, or in plane surface of complicated
   shape that has to be broken down into simpler polygons.
   HepPolyhedron breaks all surfaces into triangles or quadrilaterals.
   There will be auxiliary edges for any volumes with a curved surface,
   such as a tube or a sphere, or a volume resulting from a Boolean
   operation.  Normally, they are not shown, but sometimes it is useful
   to see them.  In particular, a sphere, because it has no egdes, will
   not be seen in wireframe mode in some graphics systems unless this
   flag is turned on.)
 
 16th July 2004  John Allison
 - Refined forced wireframe algorithm - *always* force wireframe even
   if hidden line removal is specified.
 - opengl-V06-02-04.
 
 15th July 2004  John Allison
 - Small improvement to G4XXX (sample graphics system).
 
 14th July 2004  John Allison  (vis-V06-02-01)
 - Removed deprecated commands:
     /vis/viewer/show               (use /vis/viewer/update)
     /vis/viewer/lightsThetaPhi     (use /vis/viewer/set/lightsThetaPhi)
     /vis/viewer/lightsVector       (use /vis/viewer/set/lightsVector)
     /vis/viewer/viewpointThetaPhi  (use /vis/viewer/set/viewpointThetaPhi)
     /vis/viewer/viewpointVector    (use /vis/viewer/set/viewpointVector)
   (See geant4/source/visualization/README.built_in_commands for list
   of current commands.)
 - Tidied guidance for /vis/viewer/set.
 - Included opengl-V06-02-03 (cosmetic).
 
 14th July 2004  John Allison  (vis-V06-02-00)
 - opengl-V06-02-02 and vistest-V06-02-01:
   Hidden line *and/or* hidden surface removal now work for OGL*X and OGL*Xm.
 
 1st July 2004  John Allison
 - Correction to guidance of /vis/viewer/set/hiddenEdge.
 - Small improvement to README of /vis/scene/add/axes.
 - vistest-V06-02-00.
 - opengl-V06-02-00.
 - visman-V06-02-00: Fix for porting on gcc-3.4.0: made ProcessView()
   public, since used as private friend (Gabriele Cosmo).
 
 9th June 2004  Gabriele Cosmo  (vis-V06-01-03)
 - Adopt G4DLLIMPORT/G4DLLEXPORT technique to handle extern simbols for
   allowing support of DLLs on Windows.
 - Minor correction in modeling/GNUmakefile for GLOBLIBS definition.
 - Coworks with "global-V06-01-02b".
 
 7th June 2004  Gabriele Cosmo  (vis-V06-01-02)
 - Includes "vis-HepRep-V06-01-04".
 - Export extern symbols for allowing support of DLLs on Windows.
   Modified files: G4RayTrajectory.hh, G4RayTrajectoryPoint.hh.
 - GNUmakefiles: added definition of GLOBLIBS for DLLs support on Windows.
 - Coworks with "global-V06-01-02a".
 
 9th April 2004  John Allison  (vis-V06-01-01 + interfaces-V06-01-00)
 - Tagged OpenGL as below.  Joint with interfaces-V06-01-00.
 
 7th April 2004  Guy Barrand
 - visualization/OpenGL/* : use the G4OpenGL.hh file.
 - Added : visualization/OpenGL/include/G4OpenGL.hh to encapsulate
   the include of gl/gl.h and gl/glu.h that may be platform dependant.
   It permits to rm some #ifdef WIN32 spread in the code. It opens also
   the way to the usage of the Apple OpenGL on a Mac.
 
 14 March 2004 Joseph Perl (vis-V06-00-01)
 - HepRepFile handle duplicate ShowView.
 - HepRepFile improve layering and hierarchy for hits.
 
 17th February 2004  John Allison  (opengl-V06-00-00)
 - Fixed bug #581: wrong order of statements in
   G4OpenGLXViewer::~G4OpenGLXViewer (see bug report).
 
 1st December 2003  John Allison
 - Added checks and minor improvment of behaviour at end of event and run:
   o G4VisManager::EndOfRun: added check on MarkForClearingTransientStore.
   o G4VisCommandsScene.cc: For "/vis/scene/endOf[Event|Run]Action refresh",
     SetMarkForClearingTransientStore(true).
 
 27th November 2003  John Allison  (vis-V05-02-06)
 - Added /vis/scene/endOfRunAction.
 - Includes vis-HepRep-V05-02-08.
 - G4VisManager: Removed PrintAllGraphicsSystems and
   PrintInstalledGraphicsSystems.  They are difficult to maintain and
   are anyway not used.  (There remains PrintAvailableGraphicsSystems,
   which is much used, and iterates over instantiated graphics systems
   and needs no maintenance.)
 
 20th November 2003  John Allison  (vis-V05-02-05)
 - Re-submitted.  Includes vis-HepRep-05-02-07: fixes compiler issues and
   other minor fixes.
 
 14th November 2003  John Allison  (vis-V05-02-04)
 - Includes vis-HepRep-05-02-03: new HepRep XML driver for HepRep Version 2.
 - Bug fix in G4VisManager::EndOfEvent.
 
 12th November 2003  John Allison
 - Bug in /vis/scene/add/volume: requestedDepthOfDescent now correctly
   propagated to "world" volume.
 - modeling-V05-02-02: G4PhysicalVolumeModel: CalculateExtent always
   searches complete hierarchy.
 - Change initialisation of G4VSceneHandler so that there is always a
   clear on first drawing  - fMarkForClearingTransientStore(true).
 - Removed redundant code from G4VisManager::::EndOfRun.
 
 6th November 2003  John Allison  (vis-V05-02-03)
 - management:
   o G4VisManager: improved handling of auto refresh at end of event and run.
   o G4VisCommandsScene: improved endOfEventAction and improved guidance.
   o GNUmakefile: rationalised.
 - GNUmakefile: removed G4LIBDIR and G4TMPDIR.
 - RayTracer/GNUmakefile: rationalised (raytracer-V05-02-04).
 - Tree: improved printing.
 - G4VRML2SceneHandlerFunc: changed const char* pv_name to G4String pv_name.
 - G4XXXViewer: improved comments.
 - modeling: GNUmakefile: rationalised (modeling-V05-02-01).
 - test: changed MyPhysicsList to follow kernel changes.
 
 4th November 2003  Gabriele Cosmo  (vis-V05-02-02)
 - Includes removal of OPACS module.
 - Includes "modeling-V05-02-00".
 
 17th October 2003  Guy Barrand
 - OPACS being (for long) deprecated, remove OPACS related things
   in Geant4 repository.
 
 4th October 2003  Gabriele Cosmo  (vis-V05-02-01)
 - Modified GNUmakefiles:
   o added dependency to new module "geometry/navigation".
   o replaced "digits+hits" with "digits_hits".
 - Coworks with "geometry-V05-02-00" and "digits_hits-V05-02-00".
 
 22nd September 2003  John Allison  (vis-V05-02-00, greps-V05-02-00)
 - Incorporates raytracer-V05-02-01 (needs greps-V05-02-00) - see
   RayTracer/History:
   o Introduced G4VRTScanner.
   o Added /vis/rayTracer/backgroundColour.
 - Introduced Doxygen documentation for management, OpenGL and test.
 - Improved guidance for /vis/scene/notifyHandlers.
 - OpenGL: Cosmetic change to regularise names.
 
 2nd September 2003  John Allison
 - Fixed pedantic warnings etc. in test suite - see test/History.
 
 2nd June 2003  John Allison  (vis-V05-01-01)
 - Small fix for pedantic warnings in RayTracer.
 
 30th May 2003  John Allison  (vis-V05-01-00 - does not include HepRep below)
 - Improved README.built_in_commands.  Removed unlikely-to-be-implemented
   commands.
 - Eliminated pedantic warnings.
 
 28th February 2003  Joseph Perl
 - Minor Fix to HepRep - see History file.
 
 20th January 2003  John Allison
 - Changed "/vis/scene/add/trajectories [<drawing-mode>]" so that if
   the command is issued more than once on any given scene, the last
   command takes effect, i.e., so that the last value of drawing-mode
   takes effect.
 
 17th February 2003 Satoshi Tanaka (vis-V05-00-01)
 - A Small bug fixing of VRML2 driver
  (Explicit cast from G4String to char* in G4VRML2SceneHandlerFunc.icc).
 
 24th January 2003  Joseph Perl
 - Fixes to HepRep - see History file.
 
 20th January 2003  John Allison  (vis-V05-00-00, co-works intercoms-V05-00-00)
 - Incorporated openinventor-V05-00-00: Removed erroneous additional
   transformation.
 - Added G4VisManager::Draw methods for hits and trajectories.
 
 11th December 2002  John Allison  (vis-V04-01-10)
 - Fix for SUN-CC warnings: AddThis hides the virtual function...
 - Fix memory leak in RayTracer.
 - Fixed /vis/scene/add/trajectories command.
 - Some fixes in HepRep.
 
 4th December 2002  Makoto Asai (vis-V04-01-09)
 - Migration to new G4ApplicationState
 
 27th November 2002  John Allison  (vis-V04-01-08)
 - Fixes to HepRep - see History file.
 - Added RegisterGraphicsSystem (new G4HepRep) in MyVisManager.cc.
 - Fix (removal) of ambiguous G4VVisCommand::GetNewDoubleValue.
 - Added /vis/viewer/set/globalMarkerScale.
 - Improved algorithm of CompareForKernelVisit on OpenGL and OpenInventor.
 
 21st November 2002  Gabriele Cosmo  (vis-V04-01-07)
 - Corrections to HepRep module to allow porting on egcs compiler
   (M.Donszelmann).
 - Patched access to static data in G4VisCommandsSceneAdd.cc, G4VisManager.cc
   and G4FlavoredParallelWorldModel.cc to allow porting on Windows DLLs.
   It requires co-working with tags "greps-V04-01-04" and "intercoms-V04-01-02".
 
 15th November 2002  Mark Donszelmann  (vis-V04-01-06)
 - HepRep2 driver implemented.
 
 11th November 2002  John Allison  (vis-V04-01-05)
 - Corrected inclusion of G4OpenGLXViewer #ifdef X_DRIVER for Windows
   and other small changes in OpenGL (opengl-V04-01-02).
 - Added integer argument to /vis/scene/add/trajectories [drawing-mode].
   drawing-mode is passed to DrawTrajectory.  See also modeling-V04-00-00.
 - Fixed bug in G4VisManager wich lead to zero G4VModel pointer.
 - Improved hamdling of models.
 - Corrected G4RayTracer.cc devide-by-zero (raytracer-V04-00-01).
 - VRML: bug fixing for marker size (*.icc files) (VRML-V04-01-00).
 - Samll improvements to README.built_in_commands.
 - Improved sample driver XXX.
 
 1st November 2002  John Allison (vis-V04-01-04 with...)
 geant4/source/tracking       tracking-V04-01-03
 geant4/source/intercoms      intercoms-V04-01-00
 geant4/source/graphics_reps  greps-V04-01-01
 geant4/source/digits+hits    digits+hits-V04-01-01
 
 Oct 28, 2002, J.Allison  (vis-traj03, co-works with...
 geant4/source/tracking       traj03 (head as of Tue Oct 29 15:42:14 UTC 2002)
 geant4/source/intercoms      intercoms-V04-01-00 (ditto)
 geant4/source/graphics_reps  greps-V04-01-01 (ditto)
 geant4/source/digits+hits    hits-traj03 (*not* the head)
 - Changed G4XXXSceneHandler.cc for map of G4AttDefs, and improved.
 
 17th October 2002  John Allison (vis-V04-01-03 with...)
 - Coworking tags are:
     geant4/source/tracking       traj02
     geant4/source/intercoms      intercoms-V04-00-04
     geant4/source/graphics_reps  greps-V04-01-00
     geant4/source/digits+hits    hits-traj02
 - More changes for AddThis(const G4VTrajectory&) and (const G4VHit&).
 - Minor corrections to warning messages, etc.
 - Improved end of run behaviour for non-post-processing graphics
   systems by changing false to true in G4VisManager::EndOfRun
   fpSceneHandler->SetMarkForClearingTransientStore(true);
 - Further corrections/improvements in OpenGLWin32 - not yet complete.
 
 17th October 2002  John Allison (vis-V04-01-02 with intercoms-V04-01-00)
 - Added two new pure virtual functions to G4VGraphicsScene:
     AddThis(const G4VTrajectory&)
     AddThis(const G4VHit&)
 
 16th October 2002  John Allison  (vis-traj01 co-works with tracking tag traj01)
 - Tag for changes in G4VTrajectory, etc. (raytracer-V04-00-00).
 
 16th October 2002  John Allison  (vis-V04-01-01)
 - Fix for WIN32.  Now compiles but viewer not implemented.  (opengl-V04-01-01)
 - Small improvement to README.built_in_commands.
 
 1st Sept 2002  Satoshi Tanaka  (vis-V04-01-00)
 - Precision control of g4_XX.prim files generated by
   the DAWNFILE/DAWN-Network drivers.
 
    Example:
      setenv  G4DAWNFILE_PRECISION   9
 
   The precision number is used as:
 
       sprintf( string, "%*.*g", (precision+8), precision, value)
 
   The default precision is also changed from 6 to 9.
 
 24th June 2002  John Allison
 - Further cosmetic changes in G4OpenGL for DEC compiler (opengl-V04-01-00).
 
 24th June 2002  Gabriele Cosmo  (vis-V04-00-10)
 - Exclude latest changes to OpenGL driver (opengl-V04-00-03), causing compilation
   errors on some platforms (DEC-cxx).
 
 23th June 2002  Satshi Tanaka  (vis-V04-00-09)
 - Bug fixes in G4VRMLXFileSceneHandlerFunc.icc
 - Protection of VRML-Newtork drivers for Windows platform.
   (The compilation is skipped in the Windows platform.)
 
 19th June 2002  John Allison  (vis-V04-00-08)
 - Cosmetic changes in G4VRML2FileSceneHandler.cc and G4VRML2SceneHandler.cc
   (Gabriele)
 
 10th June 2002  John Allison
 - Cosmetic changes for SUN-CC in G4OpenGLXmConvenienceRoutines.cc
   (opengl-V04-00-03).
 - Improvement to /vis/scene/add/logicalVolume guidance.
 
 6th June 2002  John Allison
 - Cosmetic changes for GNU compiler in G4OpenGLXViewer.cc (opengl-V04-00-02).
 
 8th May 2002  John Allison (vis-V04-00-07)
 - Minor changes to warning messages and README.built_in_commands.
 - Added test fro G4EllipticalTube to test/src/MyDetectorConstruction.cc.
 
 1st May 2002  John Allison (vis-V04-00-06)
 - Deprecated /vis/viewer/set/autoRefresh.
 
 26th April 2002  Makoto Asai (vis-V04-00-05)
 - Corresponds to the changes in intercoms-V04-00-00
 - Affected files :
    G4VisManager.cc G4VisCommandsViewer.cc G4VisCommandsCompound.cc
 
 22nd April 2002  John Allison (vis-V04-00-04)
 - Prevent copying of autoRefresh status with /vis/viewer/set/all command.
 - Corrected out of date advice about /vis/set/culling, etc.
 - Workaround for pseudo-parallel/orthogonal projection in Ray Tracer.
 
 28th February 2002  John Allison (vis-V04-00-03)
 - Updated OpenGL to compile (but not run) on Windows (opengl-V04-00-01).
 - Removed redundant code in GNUmakefiles in OPACS, OpenGL, OpenInventor, VRML.
 - Improved README.adding_graphics_system.
 
 23rd February 2002  John Allison (vis-V04-00-02)
 - Bug fix in modeling, which was causing nested calls to Begin/EndPrimitives.
 
 4th February 2002  Joseph Perl  (vis-V04-00-01)
 - HepRep: Check for missing hierarchy layers in HepRepXMLWriter.
   (Not strictly needed since have a culled layer check in SceneHandler,
   but may be useful in other applications of HepRepXMLWriter).
 
 3rd February 2002  Joseph Perl
 - HepRep: Detect transient data by testing for
   !fpCurrentPV || fReadyForTransients
   rather than just fReadyForTransients
 
 1st February 2002  Joseph Perl
 - Improvements to HepRep:
 - Defer file opening until first real HepRepType is to be written.
 - Moved HepRep code from AddThis to AddPrimitive.
 - Add additional levels to hierarchy if any appear to have been
   removed by culling.
 - Add visibility attribute.
 
 29th January 2002  Joseph Perl
 - Relocate HepRep file-opening logic to constructor and ShowView
   (had been in SetView).
 
 28th January 2002  vis-V03-02-23 Joseph Perl
 - Improvements to HepRep:
 - Produce hierarchical output rather than flat HepRepType structure.
 - Handle trajectories as well as detector geometry.
 - Output files now named G4Data<n>.heprep where n increments with each open.
 
 14th January 2002  vis-V03-02-22 Joseph Perl
 - Corrected handling for already open file in HepRepXMLWriter.
 
 01th December 2001 vis-V03-02-21 Satoshi Tanaka
 - Code refinements in FukuiRenderer/ directory:
   * Noisy warnings for Linux-g++ are suppressed.
     (%lg ==> %g etc)
   * G4FRSceneFunc.icc is moved from /src to /include
 
 29th November 2001  John Allison
 - Fixed some pedantic warnings and a bug thrown up by such in OpenGL.
 
 28th November 2001  Gabriele Cosmo (visman-V03-02-00 in management only).
 - Fixed pointer initialisation for porting on VC++ in G4VisCommandsSceneAdd.cc.
 
 21st November 2001  John Allison  (vis-V03-02-20)
 - Fixed G4std bug in G4HepRepFileSceneHandler.hh.
 - Fixed "hides the virtual function" warnings from G4HepRepFileSceneHandler.
 - Change to comments in G4XXXSceneHandler.hh.
 
 19th November 2001  John Allison  (vis-V03-02-19 needs config-V03-02-09+)
 - Cosmetic changes to HepRep.
 
 16th November 2001  John Allison
 - Added G4XXXDEBUG to XXX dummy system.
 
 14th November 2001  John Allison
 - Fixed bug in G4VisManager::EndOfEvent.
 - Moved code from G4VisManagerRegisterMessengers.cc to G4VisManager.cc and
   removed G4VisManagerRegisterMessengers.cc.
 
 14th November 2001  Guy Barrand
 - OpenInventor : move HEPVis/SoWindow under vis/OpenInventor/G4SoWindow
   to prepare HEPVis/6.0. (HEPVis/SoWindow will disappear from HEPVis/6.0).
 
 14th November 2001  John Allison
 - Added README.built_in_commands.
 
 13th November 2001  Satoshi Tanaka
 - visualization/README file is updated, adding minimal description
   on the HepRepFile driver.
 
 12th November 2001  John Allison  (vis-V03-02-18 needs config-V03-02-09)
 - Fixed some warnings and one error from gcc-2.95.2.
 - HepRep Type names now come from Physical Volume names (Joseph Perl).
 - Added many HepRep Attributes for other volume properties (Joseph Perl).
 
 13th Nov 2001 (JST)  Hajime Yoshida and Minamimoto (vis-V03-02-17)
 - Updation of G4RTJpegMaker.cc for Windows platform (raytracer-V03-02-01).
 
 7th November 2001  John Allison  (vis-V03-02-16 needs config-V03-02-09)
 - Corrected compilation error.
 
 6th November 2001  John Allison  (vis-V03-02-15 needs config-V03-02-09)
 - Added /vis/viewer/flush = refresh + update.
 - Moved /vis/viewer/lights and viewpoint to /vis/viewer/set.
 - Added /vis/viewer/set/upThetaPhi and upVector.
 - Added refresh|flush option to /vis/scene/notifyHandlers.
 - Moved HepRepFile classes to HepRep/ directory and removed HepRep classes
   therein.
 
 1st October 2001  Joseph Perl
 - Added first version of pure C++ HepRep driver, HepRepFile.
   See HepRep/README for details.
 
 10th September 2001  John Allison  (needs greps-V03-02-04)
 - (Non-standard tag JA-RAEOE.)
 
 10th September 2001  John Allison  (not tagged but needs greps-V03-02-04)
 - Added BeginOfRun, BeginOfEvent and EndOfRun to G4VisManager, invoked via
   G4VisStateDependent.
 - Improved handling of refresh-at-end-of-event.  All scene handlers need to
   implement ClearTransientStore and ensure rebuilding of permanent store if
   necessary.
 - Auto-refresh (notifyHandlers) after attaching scene.
 - Changed default colour of scale to red and fixed a couple of small bugs in
   the implementation of AddPrimitive(G4Scale).
 - Improved verbosity guidance.
 - Improved /vis/scene/add/scale guidance (needs greps-V03-02-04).
 - Removed /vis/viewer/refresh from compound commands.
 - Capitalised 'R' in /vis/viewer/set/autoRefresh.
 
 29th August 2001  John Allison/Joseph Perl  (vis-V03-02-14)
 - Needs config-V03-02-06.
 - First developers release of HepRep graphics driver.
 
 24th August 2001  Joseph Perl  (vis-V03-02-13-00)
 - First inclusion of HepRep graphics driver.
 
 24th August 2001  John Allison  (vis-V03-02-13)
 - Fixed bugs in G4VisManager::GeometryHasChanged.
 - Separated out G4Scene::CalculateExtent.
 - Improved robustness and timeliness of invocation of some commands.
 - Improved READMEs.
 - Reduced warnings from OpenGL - see OpenGL/History.
 - Cosmetic changes to test.
 - Added explicit invocation of base class methods to avoid warnings about
   hiding of base class methods.
 
 17th August 2001  John Allison  (vis-V03-02-12)
 - Coworks with greps-V03-02-02 and intercoms-V03-02-04.
 - Added G4VisManager::Draw(const G4Scale&,...  Needs intercoms-V03-02-04.
 - Added template graphics system XXX.
 - Improved verbosity guidance.
 
 14th August 2001  John Allison  (vis-V03-02-11)
 - Coworks with greps-V03-02-02 and intercoms-V03-02-03.
 - Moved default value G4Transform3D::Identity of argument from
   G4VSceneHandler::BeginPrimitives to
   G4VGraphicsScene::BeginPrimitives.  Needs intercoms-V03-02-03.
 - Fixed bug in G4VSceneHandler::AddPrimitive(const G4Scale&).  Needs
   greps-V03-02-02.
 - Added sceneHandler.Begin/EndPrimitives messages to models (long
   standing bug!).
 - Removed "dummy" graphics systems in G4VisManager.cc.
 - Improved robustness of some commands, particularly
   /vis/scene/notifyHandlers.
 - Improved support for multiple viewers (but see OpenGL/History).
 
 11th August 2001  John Allison  (vis-V03-02-10-01)
 - Implemented /vis/scene/endOfEventAction.
 
 9th August 2001  John Allison  (vis-V03-02-10-00)
 - Note: non-standard tag to indicate internal use only.
 - Added /vis/scene/create at start of compound command /vis/open to avoid
   warnings.
 - Removed G4ModelingParameters::hierarchy.  It is no longer used.  The
   textual or graphical representation of the geometry hierarchy is now
   done in G4xxxTree classes in visua;ization/Tree.
 - Removed /vis/scene/notifyHandlers from
   G4VVisCommandScene::UpdateVisManagerScene - too much updating going on.
   It was leading to recursive refreshing/updating.
 - Implemented auto-refresh at end of event.  (See also OpenGL/History.)
   Introduced G4VSceneHandler::Get/SetMarkForClearingTransientStore for
   postponed (lazy) clearing of transients (e.g., trajectories) from store
   (graphical database) and view.  The mark is set at the end of
   G4VisManager::EndOfEvent and the actual clearing is done in:
     void G4VisManager::ClearTransientStoreIfMarked(){
       // Assumes valid view.
       if (fpSceneHandler->GetMarkForClearingTransientStore()) {
         fpSceneHandler->SetMarkForClearingTransientStore(false);
         fpSceneHandler->ClearTransientStore();
       }
     }
   which is called at the start of each G4VisManager::Draw and the beginning
   of G4VisManager::EndOfEvent.  Thus the picture stays from the end of all
   drawing for the event until the first drawing of the next event.
 
 5th August 2001  John Allison
 - Small refinements to printing under new verbosity control.
 
 4th August 2001  John Allison  (vis-V03-02-10)
 - Re-implemented verbosity control.  Output statements wherever possible
   are controlled by the verbosity in a simple graded message scheme:
     enum Verbosity {
       quiet,         // Nothing is printed.
       startup,       // Startup and endup messages are printed...
       errors,        // ...and errors...
       warnings,      // ...and warnings...
       confirmations, // ...and confirming messages...
       parameters,    // ...and parameters of scenes and views...
       all            // ...and everything available.
     };
   Note that the G4VisManager member object name and type have changed:
     Verbosity             fVerbosity;  // New.
     const G4int           fVerbose;
     // fVerbose is kept for backwards compatibility for some user
     // examples.  (It is used in the derived user vis managers to print
     // available graphics systems.)  It is initialised to 1 in the
     // constructor and cannot be changed.
 
 3rd August 2001  John Allison
 - Added README.quick, a quick installation guide.
 
 30th July 2001  John Allison  (vis-V03-02-09)
 - Eliminated view parameters from G4VisManager.  Now, each view maintains its
   own parameters.  Can be copied from one view to another with:
     /vis/viewer/set/all <from-viewer-name>
     Copies view parameters from from-viewer to current viewer.
     Affects current viewer.
 - Removed redundant methods from G4VisManager, mostly to do with old-style
   commands.
 
 27th July 2001  John Allison  (vis-V03-02-08)
 - Needs config-V03-02-01.
 - Introduced environment variable G4VIS_NONE that, if set, no visualization
   drivers are built and no vis libraries are built, not even
   libG4vis_management.  (libG4modeling is still built.)  The C-pre-processor
   variables G4VIS_BUILD and G4VIS_USE are *not* set.
 - Removed the need to specify environment variables for visualization drivers
   which do not need external packages or libraries, namely :
       G4VIS_BUILD_DAWNFILE_DRIVER
       G4VIS_BUILD_RAYTRACER_DRIVER
       G4VIS_BUILD_VRMLFILE_DRIVER
       G4VIS_BUILD_ASCIITREE_DRIVER
       G4VIS_BUILD_GAGTREE_DRIVER
     with associated G4VIS_USE environment variables:
       G4VIS_USE_DAWNFILE
       G4VIS_USE_RAYTRACER
       G4VIS_USE_VRMLFILE
       G4VIS_USE_ASCIITREE
       G4VIS_USE_GAGTREE
   For backwards compatibility, unless G4VIS_NONE is set, the corresponding
   C-pre-processor variables are automatically set.  Also, the C-pre-processor
   variables G4VIS_BUILD and G4VIS_USE are set.
 - As before, environment variables for other drivers still need positive
   setting of their G4VIS_BUILD and G4VIS_USE environment variables.  In this
   category are:
       G4VIS_BUILD_DAWN_DRIVER
       G4VIS_BUILD_OPACS_DRIVER
       G4VIS_BUILD_OPENGLX_DRIVER
       G4VIS_BUILD_OPENGLWIN32_DRIVER
       G4VIS_BUILD_OPENGLXM_DRIVER
       G4VIS_BUILD_OIX_DRIVER
       G4VIS_BUILD_OIWIN32_DRIVER
       G4VIS_BUILD_VRML_DRIVER
     with associated G4VIS_USE environment variables:
       G4VIS_USE_DAWN
       G4VIS_USE_OPACS
       G4VIS_USE_OPENGLX
       G4VIS_USE_OPENGLWIN32
       G4VIS_USE_OPENGLXM
       G4VIS_USE_OIX
       G4VIS_USE_OIWIN32
       G4VIS_USE_VRML
   In this case G4VIS_NONE must *not* be set.
 - Fixed unchecked pointer in G4VSceneHandler::ClearStore().
 
 25th July 2001  John Allison  (vis-V03-02-07)
 - Improved access to models (modeling-V03-02-03).
 - Made G4VSceneHandler::fpModel non-const G4VModel* for convenience.
 - Improved checks and warning messages in /vis/scene/add/scale.
 
 24th July 2001  John Allison  (vis-V03-02-06)
 - Needs greps-V03-02-01 for small interface change to G4Scale.
 - Includes modeling-V03-02-02.
 - Force rebuild of graphics "stores" (graphical databases) and, if
   auto-refresh is true, refresh of all views
   (/vis/scene/notifyHandlers) after an addition to scene.
 - Improvements to /vis/scene/add/scale:
   o Added colour.
   o Assigned a genuine extent.
 
 23rd July 2001  John Allison  (vis-V03-02-05 is non existent - sorry!!!)
 - Improved /vis/scene/add/scale.
 - Improved auto-refreshing.
 
 21st July 2001  John Allison  (vis-V03-02-04)
 - Added /vis/scene/add/scale.  Needs greps-V03-02-00 and intercoms-V03-02-02.
 
 19th July 2001  Satoshi Tanaka  (vis-V03-02-03)
 - Modification of G4DAWNFILEViewer.cc
 - PostScript command "showpage" is always added to g4_XX.eps
   so that it is printable. (It can also be inserted into
   LaTeX documents.
 
 18th July 2001  John Allison  (vis-V03-02-02)
 - Ensured rotation and translation of replica is restored (modeling-V03-02-00)
   (fixes crashes in replica tracking).
 
 14th July 2001  John Allison  (vis-V03-02-01)
 - Included raytracer-V03-02-00 (minor cosmetics).
 - Minor changes in G4OpenGLXViewer.cc to eliminate pedantic ISO C++ warnings.
 - Merged vis-V03-02-patch01 (below) to head.
 - Included new disclaimer.
 
 14th July 2001  John Allison (vis-V03-02-patch01 in branch geant4-03-02-branch)
 - Fixed crash in optimised mode: added Initialise() to viewers so
   that windows are opened after viewers are fully constructed.
 
 10th July 2001  John Allison  (vis-V03-02-00)
 - Removed old-style commands.
 - Removed maintenance of G4VisManager's G4ViewParameters object (this
   will be removed soon).
 - Merged vis-V03-02-patch00 (below) to head.
 
 10th July  John Allison  (vis-V03-02-patch00 in branch geant4-03-02-branch)
 - Corrected mistake which could cause crash if user specified a non-
   existent scene handler in /vis/sceneHandler/remove.
 
 19th June 2001  Satoshi Tanaka (vis-V03-01-07)
 -OS dependence is removed from the DAWN-network driver.
  * gethostname() removed
  * G4SocketConfig.hh and G4SocketMacro.hh are removed.
 - Now "setenv G4DAWN_HOST_NAME hostname" is mandatory to use
   the DAWN-network driver.
 
 15th June 2001  John Allison
 - Added GAGTree to G4VisManager.cc, MyVisManager.cc.  Need corresponding
   changes in config.
 
 15th June 2001  John Allison (vis-V03-01-06)
 - Added 2nd template argument (less) to sets in G4ASCIITreeSceneHandler and
   G4GAGTreeSceneHandler.
 
 15th June 2001  Satoshi Tanaka (vis-V03-01-05)
 - The  first committing of GAGTree driver.
 - Other files in ./Tree/ are the same as vis-V03-01-04.
 
 5th June 2001  John Allison (vis-V03-01-04)
 - Moved re-useable code from G4ASCIITree to G4VTree.
 - Made sure all pointers in G4VisManager are initialised on construction.
 
 4th June 2001  John Allison
 - G4ASCIITree: Added logical volume name and solid name and type under
   verbosity control.
 - G4ASCIITree: Forced culling off so that all volumes are seen, even if
   "invisible".
 
 29th May 2001  John Allison
 - Small clean up in test directory.
 
 25th May 2001  John Allison
 - Bug fix in G4ASCIITree.cc: initialise fVerbosity(0).
 
 24th May 2001  John Allison  (vis-V03-01-03)
 - Added missing files G4ASCIITreeMessenger.hh/cc.
 - Bug fix in G4ASCIITreeMessenger.cc: currentAsDefault = true.
 - Drivers in alphabetical order in MyVisManager.cc.
 
 23rd May 2001  John Allison
 - Eliminated Linux pedantic warnings, except FukuiRenderer, VRML and OPACS.
 
 22nd May 2001  John Allison
 - Refined ASCIITree.
 
 21st May 2001  John Allison (vis-V03-01-02)
 - Minor bug corrections (mostly to fix things that used to work with the
   old /vis~/ commands but ceased to work with the new /vis/commands:
   o If a scene is empty at drawing time, the "world" is added.
   o Window size hint now works for OpenGL.
 - Fixed some minor warnings for strict C++ (size_t, etc.).
 
 18th May 2001 John Allison
 - Removed unnecessary virtual inheritance of G4VViewer in G4RayTracerViewer.
 - Introduced verbosity to ASCIITree.
 - Proper deletion of directories in G4VisManagerRegisterMessengers.
 
 15th May 2001 John Allison
 - Fixed bug in name of /vis/viewer/set/sectionPlane command.
 
 3rd May 2001 John Allison (vis-V03-01-01)
 - Changes for greps-V03-01-01 (elimination of RW).
 - Improvements in /vis/scene/add/volume.
 - Added /vis/drawTree.
 
 10th April 2001  John Allison (vis-V03-01-00)
 - Added two new commands:
     /vis/scene/add/text
     /vis/scene/add/axes
 - Added first version of ASCIITree to dump geometry hierarchy to
   standard output as ASCII stream.
   This requires two new environment variables:
     G4VIS_BUILD_ASCIITREE_DRIVER
     G4VIS_USE_ASCIITREE
   and config-V03-01-00.
 
 2nd April 2001  John Allison
 - Tidied OpenGL (opengl-V03-00-01) - see OpenGL/History.
 
 2nd April 2001  John Allison  (vis-V03-00-09)
 - Fixed some warnings from DEC cxx.
 
 15th March 2001  John Allison  (vis-V03-00-08)
 - Changed rotation of phi-replicas in G4PhysicalVolumeModel.cc to
   ensure correspondence with rule that phi=0 bisects the replica.
   WARNING: Prior to this fix the graphics did NOT correspond to the
   replica navigation.  If you have been relying on the graphics to
   position daughter volumes in a phi-replica, navigation will have
   been incorrect, possibly without causing a crash.  The above fix
   will change the apparent position as shown by the graphics and you
   will have to correct the positioning of daughters.  Make sure the
   diaghters are all properly enclosed within the replica.  Graphics
   and navigation now correspond,
 
 7th March 2001  John Allison  (vis-V03-00-07)
 - Cosmetic corrections for ISO compliance.
 
 23rd February 2001  John Allison  (vis-V03-00-06)
 - Removed all references to RogueWave.
 
 4th February 2001  John Allison  (vis-V03-00-05)
 - Reverted to /vis/viewer commands updating vis manager's view parameters.
   Otherwise this can have a big effect on users if old commands are still
   being used.  Let's schedule this change for the next version of Geant4.
 - Added the following new commands:
   /vis/enable [true|false]
   /vis/disable
   /vis/verbose [<verbosity-integer>]
   /vis/viewer/set/lineSegmentsPerCircle  [<number-of-sides-per-circle>]
   /vis/viewer/set/sectionPlane ...
   Only /vis/scene/add/text and /vis/scene/add/axes to go!!!
 
 4th February 2001  John Allison  (vis-V03-00-04)
 - /vis/viewer commands no longer update vis manager's view parameters.
 - Most /vis~/ copmmands give DEPRECATED warning, except:
   /vis~/draw/axes
   /vis~/draw/text
   /vis~/set/section_plane
   /vis~/set/sides
   /vis~/set/verbose
   which have still to be re-implemented.  All /vis~/ commands are still
   available through /vis/ for the time being.  (Window size hint no longer
    works.)
 - Added "auto refresh" to view parameters.
 - Added "default" view parameters to viewers.
 - Made OpenGL viewers "auto refresh" by default.
 - Added:
   /vis/viewer/set/autoRefresh
   /vis/viewer/set/projection
 - Added compound command:
   /vis/drawView [<theta-deg>] [<phi-deg>]
                 [<pan-right>] [<pan-up>] [<pan-unit>]
                 [<zoom-factor>]
                 [<dolly>] [<dolly-unit>]
 
 4th February 2001  John Allison  (vis-V03-00-03)
 - Added several new vis commands:
   /vis/viewer/dolly
   /vis/viewer/dollyTo
   /vis/viewer/lightsThetaPhi
   /vis/viewer/lightsVector
   /vis/viewer/pan
   /vis/viewer/panTo
   /vis/viewer/viewpointThetaPhi
   /vis/viewer/viewpointVector
   /vis/viewer/zoom
   /vis/viewer/zoomTo
   /vis/viewer/set/hiddenMarker
   /vis/viewer/set/lightsMove
 
 3rd February 2001  John Allison  (vis-V03-00-02)
 - Tidied for CodeWizard.  Small changes to many files in management, modeling
   and OpenGL.
 
 1st February 2001  John Allison  (vis-V03-00-01)
 - Fixed cause of crash when setting viewpoint before creating scene (Bug #157).
   Solution: SetView no longer called when view parameters are changed.  In
   any case it's called just before drawing, whixh is the right place.
 - Fixed /vis/set/sides problem (Satoshi Tanaka) (Bug #204).
   Solution: Update view's view parameters in /vis/set/sides - had somehow
   been overlooked.
 
 25th January 2001  John Allison
 - Added protection against empty G4Polyhedron objects.
    FukuiRenderer/src/G4FRSceneFunc.icc
    OPACS/src/G4GoSceneHandler.cc
    OpenGL/src/G4OpenGLSceneHandler.cc
    OpenInventor/src/G4OpenInventorSceneHandler.cc
    VRML/src/G4VRML1SceneHandlerFunc.icc
    VRML/src/G4VRML2SceneHandlerFunc.icc
 
 25th January 2001  John Allison  (opengl-V03-00-00)
 - Fixed Bug #120.  Implemented running re-calculation of up-vector in
   the case of "object rotation" (lights move with camera) to prevent
   "flipping" of view when camera passes through up-vector.  Note that
   the default is "camera rotation" (lights do not move with camera,
   i.e., remain fixed relative to object) so the default is that this
   "flipping" can happen.  To set "object rotation" (lights move with
   camera) use /vis/lights/move_with_camera true (soon to be
   /vis/viewer/set/lights move-with-camera) or click "Object" radio
   button on Rotation Panel in OpenGLXm mode.
 - Changed some objects to references for efficiency.  E.g.:
   const G4Vector3D& vp = pView->fVP.GetViewpointDirection ().unit ();
 
 18th January 2001  John Allison
 - Corrected G4PhysicalVolumeModel.  This corrects a bug whereby the
   requested drawing of a physical volume and its decendants starting
   at a depth greater than 2 was incorrectly positioned on the screen.
 - /vis/scene/include commands withdrawn - use equivalent commands
   /vis/scene/add.
 - OpenGL: cosmetic and minor performance improvements.
 
 16th January 2001  John Allison  (vis-03-00-00)
 - All vis commands "available" in all G4 states.
 - Other small cosmetic changes to commands.
 - OpenGL: square and circle markers correctly rendered.
   Note: subsequent rotations in stored mode also rotate these markers.
 - Some small changes to test  - see test/History.
 
 2nd November 2000  Gunter Folger  (vis-V02-00-02)
 - Added targets includes and clean_libs to visualization/GNUmakefile.
 
 18th October 2000  John Allison  (vis-V02-00-01)
 - G4PhysicalVolumeModel: protected against volumes without material.
 - Removed /vis/viewer/update from compound commands /vis/drawVolume
   and /vis/specify.
 - Updated comments in G4VisManagerRegisterMessengers.cc.
 
 19th August 2000  John Allison  (vis-V02-00-00)
 - Fixed bug in /vis/lights/direction - now does not refresh view.
 - Corrected "scene" where it should read "scene handler" in some
   comments and output statements.
 
 3rd July 2000  John Allison
 - Explicitly initialised all data members of G4ViewParameters in constructor.
 
 9th June 2000  John Allison  (vis-V01-01-06)
 - Tagged for system testing.
 
 8th June 2000  Guy Barrand
 - OPACS/src/G4GoSceneHandler.cc : correct polyhedron
   wire-frame in order to remove some edges. Now the
   rendering is the same than for OpenGL driver.
    This was requested for long by ALICE, and had been
   requested for ATLAS by Gaston Parrour recently.
 
 7th June 2000  John Allison
 - /vis/viewer/update preferred, synonym /vis/viewer/show deprecated.
 
 7th June 2000  Makoto Asai
 - Fix the flip view of RayTracer.
 
 2nd June May 2000  John Allison
 - Forced /control/verbose 2 for compound commands.
 
 20th May 2000  John Allison
 - Bug fix in G4PhysicalVolumeModel for replicas (Guy Barrand).
 
 26 May 2000  Guy Barrand
 - management/src/G4VisCommandsScene.
   Protect against a null pointer for aScene in NotifyHandlers::SetNewValue.
 - OPACS/src/G4WoViewer.cc :
   Change camera name checking so that a viewer created
   by the GUI (Wo) could be hooked.
 - OPACS/src/G4GoSceneHandler.cc :
   Change circle rendering.
 - OpenInventor/G4OpenInventorSceneHandler : protect against null pointers.
 
 22nd May 2000  John Allison  (vis-V01-01-05)
 - Many bug fixes from in OpenGL (opengl-V01-01-00) - see OpenGL/History.  Main
   features:
   o workaround for bug in Mesa which slowed OpenGLXm (Guy Barrand).
   o multiple OpenGLXm windows no longer cause crash on exit (Guy).
 - modeling-V01-01-00: Added G4VTreeGraphicsScene (DTREE).
 - G4Scene::IsEmpty if empty of RunDurationModels - VisManager adds world in
   this case.
 
 18th/19th May 2000  John Allison
 - Introduced some /vis/viewer/set commands.
 - /vis/scene/include/trajectories changed to /vis/scene/add/trajectories.
   Similarly hits.  (Old commands kept but deprecated.)
 - G4ViewParameters.cc: bug fix in density culling printing.
 - G4VisCommandsSceneHandler.cc: bug fix in /vis/sceneHandler/create.
 - G4VisManagerRegisterMessengers.cc: improved comments.
 
 18th May 2000  John Allison  vis-V01-01-04
 - Included DAWN-V01-01-04: Automatic filename incrementation is made default.
 
 15th May 2000  John Allison
 - Added compound commands /vis/open, /vis/drawVolume and /vis/specify.
 - /vis/viewer/reset now resets *all* view parameters.
 - Fixed double application of transformation in /vis/scene/add/volume.
 - Fixed verbosity parameter in /vis/scene/list.
 - Made G4BoundingSphereScene::PreAddThis non-inline.
 
 13th May 2000  John Allison
 - Redefined current target point to be *relative* to standard target point.
   (No longer necessary to initialize current target point in G4VViewer
   constructor.  The fix of 4th May is reversed.)
 
 11th May 2000  Satoshi Tanaka vis-V01-01-03
 - In G4DAWNFILEViewer.cc,
   <       strcpy( fPSViewer, "ghostview" );
   ---
   > //    strcpy( fPSViewer, "ghostview" );
   >       strcpy( fPSViewer, "gv" );
 
 
 4th May 2000  John Allison
 - Tidied comments in G4VisManagerRegisterMessengers.cc.
 - Initialize current target point in G4VViewer constructor.
 - Re-implemented /vis/viewer/reset to change view parameters of
   viewer directly.
 
 2nd May 2000  John Allison  vis-V01-01-02
 - Added /vis/viewer/reset.
 - G4VSceneHandler, G4VViewer, G4OpenGLXmMainMenubarCallbacks: corrected
   some name anomolies - "scene" was still being used in places where it
   meant "scene handler".
 - G4VViewer: added GetShortName(), corrected SetName(...).
 - G4ViewParameters.hh: improved class description.
 - G4VisManager: added ViewerShortName(...) and GetViewer(...) utilities.
 - G4RayTracer: set out-of-world ray to black.
 - G4RayTracerViewer: corrected trapping of orthogonal projection.
 - Some minor enhancements to tests.
 
 27th April 2000  Gabriele Cosmo
 - Removed unnecessary #include "G4Transform.hh" from VRML.  (Since
   geometry-V01-01-02 G4Transform.hh no longer exists.)
 
 27th April 2000  John Allison
 - Updated README file.
 
 12th April 2000  John Allison  vis-V01-01-01
 - Made G4PhysicalVolumeModel::DescribeSolid virtual.
 - G4PhysicalVolumeModel::DescribeSolid no longer deals with composite
   solids - now programmed into CompositeSolid::CreatePolyhedron, where
   CompositeSolid means G4IntersectionSolid, G4SubtractionSolid and
   G4UnionSolid.
 - G4PhysicalVolumeModel::DescribeSolid no longer deals with displaced
   solids - now programmed into G4DisplacedSolid::CreatePolyhedron.
 - Added G4LogicalVolumeModel::DescribeSolid, which explicitly adds
   components of composite solids as white forced-wireframe objects.
 - Removed unnecessary #includes from G4VSceneHandler.hh which required
   consequent inclusion in many other scene handlers and viewers.
 
 7th April 2000  John Allison  vis-V01-01-00
 - Modified GNUmakefiles for restructured geometry.
 
 29th February 2000  John Allison  vis-V01-00-06
 - Changed `char*' to `const char*' in G4FRClientServer::Err(...).
 
 28th February 2000  John Allison
 - Cosmetic improvements to G4RayTracerSceneHandler.hh and G4RayTracerViewer.hh.
 
 24th February 2000  John Allison
 - Minor inmprovement of messages from /vis/viewer/refresh.
 - Cosmetic tidying in G4OpenGLViewer.cc.
 - Added protection for null viewer in G4RTSteppingAction.cc and
   G4RayTrajectory.cc.
 - Corrected for zoom, etc., in G4RayTracerViewer.cc.
 
 23rd February 2000  John Allison
 - Added G4RayTracerSceneHandler and Viewer.
 - Some modifications to other RayTracer routines for vis compliance.
 - (Note: headAngle still not right - ray traced views are sometimes tipped.)
 
 23rd February 2000  John Allison  vis-V01-00-05
 - Includes raytracer-V01-00-01a which is original version plus fixes for
   ISO compliance.
 
 21st February 2000  John Allison
 - /vis/viewer/refresh no longer invokes ShowView().
 - G4VViewer: introduced data member fShortName.
 - Added G4RTSteppingAction and G4RayTrajectory to list of G4VisManager's
   friends.
 - Improved G4VisManager::CreateSceneHandler() and CreateViewer() and
   handling of error in G4VisCommandSceneHandler::Create() and
   G4VisCommandViewer::Create().
 - OpenGL: char* becomes const char*.  Small output text improvement.
 - test: some changes for Ray Tracer.  Boolean intersection instead of union.
 
 02 February 2000  Guy Barrand
 - OPACS/src/G4XoViewer.cc : change WaitForNotify signature to
   be able to compile with DEC-cxx 6.1.
 
 vis-V01-00-04 29th January 2000  Satoshi Tanaka
 - CVS tag is assigned to the Makoto's committing below.
 
 29th January 2000  Makoto Asai
 - Introduction of G4RayTracer (visualization/RayTracer/...)
 - Migration of G4RayTracer
   affected files :
     visualization/GNUmakefile
     visualization/management/include/MyVisManager.cc
     visualization/management/src/G4VisManager.cc
   affected files in other directory :
     config/G4VIS_BUILD.gmk
     config/G4VIS_USE.gmk
 
 vis-V01-00-03  17th January 2000  John Allison
 - Added protection for no voxelisation in G4LogicalVolumeModel.cc.
 - Changed endl to G4endl in G4VisCommandsViewer.cc and G4GoSceneHandler.cc.
 
 14th January 2000  John Allison
 - Added protection for no viewer in G4VisCommandsViewer.cc.
 
 vis-V01-00-02  11th January 2000  John Allison
 - General handling of displaced solid (G4PhysicalVolumeModel).
 - Introduced /vis/viewer/show (/vis/viewer/update is synonym).
 - Improved printing in /vis/camera/reset.
 
 vis-V01-00-01  27th December 1999  Satoshi Tanaka
 - VRML-V01-00-00 27th December 1999  Satoshi Tanaka
 - G4endl ==> "\n" for fDest objects ... for ISO standard C++ compiler
 
 vis-V01-00-00  16th December 1999  John Allison
 - (Note: NOT FOR SYSTEM TESTING - this tag still has problems with
    displaying logical volumes and text.)
 - Added /vis/viewer/refresh.
 - Rationalised command lists for keeping parameter lists up to date,
   G4VVisCommand::sceneNameCommands, etc.
 - Added AddThis(const G4Polycone&), etc., to prevent hiding warnings.
 - Developments in test - see test/History.
 
 vis-V00-01-14a  7th December 1999  John Allison
 - Added `class' keyword in friend statement in G4VisStateDependent.hh
   to keep HP happy.
 
 vis-V00-01-14  6th December 1999  John Allison
 - Invert rotation of boolean component in G4PhysicalVolumeModel.cc.
 
 vis-V00-01-13  Satoshi TANAKA  Dec 01, 1999
 - DAWN-V00-01-08
 - Removed implicit casting from the previous updation
 
 vis-V00-01-12  Satoshi TANAKA  Nov 30, 1999
 - DAWN-V00-01-06
 - Fixing improper definition of alpha1, alpha2
 
 vis-V00-01-11  29th November 1999  John Allison
 - Introduced helper class G4VisStateDependent to decouple G4VisManager from
   G4StateManager, G4RunManager, etc.
 - Archived old directoris inside test subdirectory.
 
 vis-V00-01-10  25th November 1999  John Allison
 - Adapted relevant header files of modeling and management for
   Software Reference Manual.
 
 vis-V00-01-09  23th November 1999  Satoshi Tanaka
 - Protection to ill-defined G4Trap in AddThis()
 
 vis-V00-01-08  10th November 1999  John Allison
 - Added capability of viewing Boolean solids - coworks with geometry-V00-01-01.
 - Fixed bug in G4VViewer to maintain proper status of fNeedKernelVisit.
 - Added Boolean solids to test/src/MyDetectorConstruction.cc.
 - Added circle to represent end of step in test/src/MySteppingAction.cc.
 
 vis-V00-01-07  5th November  John Allison
 - Added /vis/viewer/update [<viewer-name>].
 - Some groundwork for /vis/scene/edit.
 - Added additional check in G4VisManager::IsValidView().
 - G4VSceneHandler::ClearStore() invokes fpViewer -> NeedKernelVisit().
   (After a clear of the graphical database it is necessary to do this.
   So if a derived class redefines, it must still invoke this base
   class method.
 - G4Scene::AddRunDurationModel(), AddWorldIfEmpty(), AddEndOfEventModel():
   avoid duplicate models and flag with G4bool return argument.
 - G4VisCommandsSceneAdd: respect the above G4bool return value.
 - G4Scene::AddRunDurationModel(): remove temporary workaround for old CLHEP
   non-const problem.
 - Added 3rd template argument of map (to keep Sun CC 4.2 happy) in
   G4OpenGLStoredSceneHandler.hh and G4OpenInventorSceneHandler.hh.
 - G4OpenGLStoredSceneHandler::ClearStore() and
   G4OpenInventorSceneHandler::ClearStore() invoke base class function
   G4VSceneHandler::ClearStore().
 
 VRML-V00-01-01 4th November 1999  Satoshi Tanaka
 - Introduction of VRMLBeginModeling() for new vis commands
 - Updation and tagging of visualization/VRML/
   and this History file
 
 DAWN-V00-01-04  04th November 1999 Satoshi TANAKA
 - Protection to AddPrimitive( G4NURBS )
 - Updation and tagging of visualization/FukuiRenderer/
   and this History file
 
 DAWN-V00-01-03  02nd November 1999 Satoshi TANAKA
 - Updation and tagging of visualization/FukuiRenderer/
   and this History file
 - Environmental variable G4DAWN_MULTI_WINDOW is
   renamed to G4DAWNFILE_MULTI_WINDOW for DAWN-file driver.
   (G4DAWN_MULTI_WINDOW  still works for a while.)
 
 DAWN-V00-01-02  01st November 1999 Satoshi TANAKA
 - Updation and tagging of visualization/FukuiRenderer/
   and this History file
 - Separation of BeginModeling() and FRBeginModeling().
   Co-workable with /run/beamOn with the new vis commands.
 
 29 Oct 1999  Guy Barrand
 - Modify  G4Xo.cc to not load G4Xo.xrm resource file.
   Resource must be grouped in some g4.xrm file.
 
 vis-V00-01-06  25th October 1999  John Allison
 - No longer update view parameters in /vis/scene/add/volume, etc.
 - Change G4RWTValHashDictionary to G4std::map in G4OpenGLStoredSceneHandler
   and G4OpenInventorSceneHandler (needs global-V00-01-03).
 
 11 Oct 1999  Guy Barrand
 - G4GoSceneHandler.cc/G4GoSceneHandler::EndPrimitives : modify
   the logic of setting the OMatrix for Go objects in order
   to avoid the usage of the CLHEP/Rotation.getAngleAxis that
   clearly has precision problem on some platforms (at least
   Linux and HP-UX).
 
 vis-V00-01-05  4th October 1999  John Allison
 - Implemented /vis/scene/add/logicalVolume.
 - Added G4LogicalVolumeModel.
 - Augmented G4PhysicalVolumeModel so G4LogicalVolumeModel could inherit.
 - Updated G4BoundingSphereScene and G4PhysicalVolumeSearchScene to
   implement extra virtual functions in G4VSceneHandler interface.
 - Moved virtual destructor G4VModel::~G4VModel to non-inline implementation.
 - Tidied G4VSceneHandler.
 
 vis-V00-01-04 30 Sep 1999  Satoshi Tanaka
 - RW/STL dependence was removed from VRML 1.0 driver
 
 15 Sep 1999  Guy Barrand
 - Modify  G4OpenGLStoredSceneHandler.cc to compile on Linux-g++ with STL.
 
 vis-V00-01-03  27th August  John Allison
 - Modified GNUmakefile to prevent building of global libraries.
 
 vis-V00-01-02  27th August  John Allison
 - Eliminate residual references to G4Ray.
 - Improved some informational printing in G4VisManager::IsValidView.
 - G4Vis
 Manager::SetCurrentGraphicsSystem no longer gives spurious warnings.
 - Improved README (change `gmake global' to plain `gmake').
 
 vis-V00-01-01 26th August Satoshi TANAKA
 - Protection for invalid calling of BeginModeling
 - .DAWN.history ==> .DAWN_1.history
    **** It means DAWN version 3.80a or  after is  required ***
 
 vis-V00-01-00  24th August Satoshi TANAKA
 - Improved README.
 
 vis-01-00-15a  3rd July 1999  John Allison
 - Improved README (Guy).
 - Corrected a fprintf statement in G4OpenGLXViewer::spewWireframeEPS.
 
 vis-01-00-15  29th June 1999  John Allison
 - Moved #include <rw/tvhdict.h> from G4OpenGLSceneHandler.hh to .cc.
 - Corrected #ifdef G4VIS_BUILD_OPENGL_DRIVER in G4OpenGLXViewer.hh.
 
 vis-01-00-14  19th June 1999  John Allison
 - Removed references to G4Ray from GNUmakefile.
 - Archived (cvs removed) all G4Ray files.
 - Cosmetic change to an output statement in G4VisToOldVisCommands.cc/
 
 vis-01-00-13  1st June 1999  John Allison
 - Updated README for May Release (Satoshi, John).
 - Removed G4Ray from tag.
 
 31 Mai 1999  Guy Barrand
 - G4XoViewer : remove enabling/disabling XoCamera popup menu logic.
   In some situation (N03) we were loosing the XoCamera popup menu.
 - G4XoViewer : correct ClearStore, ClearTransientStore.
 
 vis-01-00-12a  26th May 1999  John Allison
 - G4TrajectoriesModel.cc: (*TC) [iT] -> DrawTrajectory ();
 
 vis-01-00-12  25th May 1999  John Allison
 - Moved global operator != to member function.
 - Updated OPACS to handle "ClearTransientStore" (Guy).
 
 vis-01-00-11  12th May 1999  Guy Barrand
 - G4VSceneHandler : ClearTransientStore.
 - G4VisCommandsSceneHandler : protect against a null pointer.
 - OpenInventor : use HEPVis/SoWindow to create windows (needed
   on NT). Implement the a "transient scene graph" for "event"
   things. Use fXxx convention for fields.
 - G4TrajectoriesModeling : do not draw a "marker" at each step by default.
 
 vis-01-00-10  10th May 1999  John Allison
 - Acted upon Code Wizard reports.  Mainly made destructors virtual.
 
 vis-01-00-09  28th April 1999  John Allison
 - Changes for UserAction classes.
 
 vis-01-00-08  John Allison
 - Changes by Paulo Mora de Freitas for decoupling vis from parameterisation.
 
 18th April 1999  John Allison
 - Added "defined" after || in VRML1(1)(File).hh.  (Some preprocessors
   give an error without it.)
 
 vis-01-00-07  15th April 1999  John Allison
 - Replaced visualization/test/GNUmakefile by a simple one using binmake.gmk.
 - Added CPPFLAGS += -I$(G4BASE)/intercoms/include to some GNUmakefiles ready
     for the move of G4VGraphicsScene to intercoms.
 
 vis-01-00-06  29th March 1999  John Allison
 - Platform dependency fix in G4VisCommandsScene.cc.
 
 vis-01-00-05  7th February 1999  John Allison
 - management: - Added /vis/scene/notifyHandlers.
               - Added virtual functions AddThis (const G4Polycone and
                 G4Polyhedra to G4VSceneHandler
               - Moved some code from G4VisManager to G4Scene::AddWorldIfEmpty.
               - Various refinements and bug fixes.
 - modeling: Augmented G4PhysicalVolumeSearchScene and G4BoundingSphereScene
             See modeling/History.
 - OpenGL: - Corrected edgeCount check for triangles in
             G4OpenGLSceneHandler::AddPrimitive (const G4Polyhedron&).
           - Added (long unsigned int) cast in G4OpenGLXmRotationCallbacks.cc.
           - Added SetView and ShowView to G4OpenGLXViewer:
               // To force change of context...
               void G4OpenGLXViewer::SetView () {
                 glXMakeCurrent (dpy, win, cx);
                 G4OpenGLViewer::SetView ();
               }
               // Hopefully to get better flushing in DEC OpenGL...
               void G4OpenGLXViewer::ShowView () {
                 glXWaitGL ();
                 glFlush ();
               }
 
 
 vis-01-00-04 11th January 1999  John Allison
 - Completed change of names from scene to sceneHandler, view to viewer.
 - Vis manager and scene handlers now keep pointer to scene, rather than a copy.
 - G4SceneList now a simple G4RWTPtrOrderedVector.
 - /vis/camera/reset now resets viewpoint direction and up vector.
 
 vis-01-00-03 10th January 1999  John Allison
 - Added flags for viewing geom, hits, digis to G4ModelingParameters.
 
 vis-01-00-02  9th January 1999  John Allison
 - Changed Scene to SceneHandler, View to Viewer.
 
 vis-01-00-01  6th January 1999  John Allison
 - Made G4VisManager::GetInstance() private to prevent inadvertent misuse.
 - Removed #include GNU_GCC - no longer necessary for egcs.
 - Continued developing the new commands.
 
 vis-00-04-04  16th December 1998  John Allison
 - test/GNUmakefile for Linux-g++
 - test/test19.cc - removed g4templates.hh
 - OpenGL - reverted to 100%.
 
 vis-00-04-03  9th December 1998  John Allison
 - Made /vis/ commands from /vis~/.  The idea is to maintain backwards
   compatibility while allowing us to "deprecate" the old commands over
   a period of time.  Some of these /vis/ commands respond with "superceded",
   i.e., superceded by new commands, but still available in /vis~/.
 - OpenGL viewing volume increased by 20% to prevent corners being clipped.
 
 - 08/12/98 : G.Barrand : OpenInventor : due to
   huge load problems on various platforms, init only
   the HEPVis things that are needed.
 
 vis-00-04-02  30th November 1998  Satoshi Tanaka
 - G4VRMLFILE_DEST_DIR for customising out file name - see VRML/History.
 
 29th November 1998
 - Added CPPFLAGS += -I....electromagnetic/utils/include to test/GNUmakefile.
 - Added fName to G4SceneData.
 
 vis-00-04-01  25th November 1998  John Allison.
 - G4Ray/GNUmakefile update for move of files in particles.
 - Added const G4VisAttributes* fpDefaultVisAttributes and access
   functions to G4ModelingParameters.
 - Reverted to default assignment operator and copy constructor for
   G4ModelingParameters and G4ViewParameters.
 - G4PhysicalVolumeModel can now handle invisible daughters.
 - More new /vis/ commands - depends on intercoms-00-04-01.
 - G4VScene passes DefaultVisAttributes* to ModelingParameters.
 
 vis-00-03-07  23rd November 1998  John Allison.
 - modeling/GNUmakefile update for move of files in particles (Hisaya).
 - Removed semi-colon in G4BoundingSphereScene.cc.
 
 vis-00-03-06  9th November 1998  John Allison.
 - Small change to a message in G4VisManager.
 - VRML refinement - see VRML/History.
 - Needs greps-00-03-03.
 
 vis-00-03-05b  9th November 1998  John Allison.
 - Merged 6th November changes with vis-00-03-05a
 - Bug fix in G4VisManager::IsValidView for batch running.
 - Needs greps-00-03-03.
 
 vis-00-03-05a  9th November 1998  Satoshi Tanaka
 - VRML 2.0 Visualization driver is added to
   management/include/MyVisManager.cc.
 
 vis-00-03-05  9th November 1998  Satoshi Tanaka
 - VRML 2.0 Visualization driver is commited:
  (1) Generatin of VRML 2.0 format files to describe Geant4 simulation.
  (2) Interactive displaying of physiccal-volume names and copy numbers
  (3) Interactive displaying of hit positions (displayed strings are
      costomizable.
  (4) Wireframe drawing style of Geant4 visualization is reflected as
      transparency = 0.7.  This value is customizable.
      If transparency is 1.0, drawing of detector geometry is skipped,
      and hits can be picked easily.
 
 6th November 1998  John Allison
 - Implemented basic /vis/viewer commands.
 - Added `const G4String& name' argument to G4VScene and G4VView constructors.
 
 vis-00-03-04  30th October 1998  John Allison
 - Tagged.
 
 29th October 1998  Guy Barrand
 - G4OpenGLXView.hh, G4OpenGLXmView.cc, G4OpenGLXmWindowHandlingCallbacks.cc
   in order that things compile and compile without warnings on HP/aCC
 
 14th October 1998  John Allison
 - Augmented the new /vis/ commands.  Still not complete but they
   co-work with the old commands.
 - Changed char* fName to G4String fName in G4VScene and G4VView.
   Consequent changes in G4OpenGLView.  Also OpenInventor?  Etc.
 
 11th October 1998 Andy Walkden
 - added (not a very good) version of hidden lines removal code. This code
   suffers from depth buffering artefacts. glPolygonOffset is a feature of
   OpenGL version 1.1, and can help overcome depth buffer problems. The code
   to utilise glPolygonOffset is committed, but commented out, as it doesn't
   seem to work with the version of Mesa available on rsplus currently. My
   ideal strategy is to enable depth testing, draw the model as lines, enable
   filled polygon offsetting (glPolygonOffset(1.0 /*offset scale factor*/,
   2/*offset bias*/); glEnable (GL_POLYGON_OFFSET_FILLED);) then draw the
   model as filled polygons. The offsetting should just add `2' (in window
   coordinates, I think) onto the z value of all vertices relating to filled
   polygons, thus dismissing the conflict between almost identical z values
   for lines and filled polygon edges.
 
 vis-00-03-03 9th October 1998  John Allison
 - G4VisManager inherits G4VStateDependent.  This is used to draw
   end-of-event models.
 
 4th October 1998 Andy Walkden
 - Added ability for all G4OpenGLX derived graphics systems to produce
   vectored PostScript hardcopy. Facility for `automated screen dump'
   (i.e. pixmap output) still kept, as some rasterization features
   don't make it into the vectored PostScript output (such as haloing
   effects). Facility currently available via G4OpenGLXm by clicking
   `Miscellany' then `Create .eps file', to get a popup printing
   window.
 
 vis-00-03-02a  26th September 1998
 - DAWNFILE driver is made platform dependent.
   (It is now compilable both at both Unix and NT without necessity
    of C macros like WIN32.)
 
 vis-00-03-02  25th September 1998
 - DAWNFILE driver is ported to VC++
 
 vis-00-03-01  24th September 1998  John Allison
 - Eliminated G4VPhysicalVolume* fpWorld data memebr from G4VisManager.
 
 22th September 1998 Guy Barrand.
 - Correct modeling, management, G4Ray /GNUmakefile to have
   correct digits+hits includes.
 
 19th September 1998 Guy Barrand.
 - Due to a correction in globals.h restore correct code
   so that OpenInventor files compile correctly on NT.
 
 vis-00-02-06  31st August 1998  John Allison
 - Added G4VModel::Validate() and in subclasses.
 - Reverted to default copy constructir and assignment operator in G4SceneData.
 - Implemented G4VisManager::GeometryHasChanged().
 - Switched on echoing of commands and history mechanism in test19.g4m.
 
 vis-00-02-05  27th August 1998  John Allison
 - Added G4HitsModel and G4TrajectoriesModel.
 - Added /vis/scene/include/hits and trajectories, and some bug fixes.
 
 vis-00-02-04  22nd August 1998  John Allison
 - Many changes in modeling - see modeling/History.
 - New commands: /vis/scene/create, list, add/volume, add/ghosts.
 
 vis-00-02-03a  20th August 1998  John Allison
 - Restored some code in G4SceneData.cc
 - Fixed syntax bug in G4PhysicalVolumeSearchScene.hh
 
 vis-00-02-03  14th August 1998  John Allison
 - Added G4VisManager::GeometryHasChanged() - run manager can notify change.
 - Removed AddRun(Event)DurationModelToCurrentSceneData - no longer used.
 - Some bug corrections in visualization/OpenGL (Guy Barrand - see
   vis blackboard for details).
 - Some protection added in visualization/OPACS (do.)
 - Created visualization/test/OPACS (do.)
 
 12th August 1998  John Allison
 - More new commands - not fully functional yet.
 
 11th August 1998  Guy Barrand
 - G4OpenInventor : remove uneccesary includes.
 
 vis-00-02-02b  11th August  Satoshi Tanaka
 - AddPrimitive() for polymarker are implemented in DAWN and VRML drivers.
 
 vis-00-02-02a  9th August  John Allison
 - Small bug fix in G4VisCommandsScene.cc.
 
 vis-00-02-02  9th August  John Allison
 - Changed '.' to '-' in scene/view names.
 - Began introduction of new /vis/ commands.
 - Consequent changes to test - see test/History.
 
 7th August  Guy Barrand.
 - OPACS : use G4VView name to build widget names.
 - OPACS : use new interactor parenting logic.
 - OpenGL, OpenInventor, G4Ray : clean compilation warnings for OSF1/cxx, HP/aCC.
 
 7th August  John Allison/Satoshi Tanaka/Guy Barrand.
 - Added G4<driver>Scene::AddPrimitive (const G4Polymarker&) to keep
   compilers happy.
 
 vis-00-02-01  6th August  John Allison
 - Created G4VisManagerRegisterMessengers.cc.
 - Bug fix in G4VisManager: now follows change of world volume after
   /vis~/clear/scene.
 - OpenInventor: Correct some upper -> lower case mess (Guy Barrand)
 - G4RayView: syntax bug fixes.
 
 4th August 1998 Andy Walkden
 I made some changes to OpenGL code...
 The changes are (i) to tidy up some redundant hidden line
 removal function calls, (ii) to put some hidden line removal
 code in G4OpenGLScene::AddPrimitive(G4Polyhedron) and
 (iii) to add an option to generate an encapsulated postscript
 file of the current view in OpenGLXm. There is now a button
 in the Miscellany pulldown of the main menubar to bring up
 a shell in which you can specify a filename, colour or black
 and white and request the creation of a .eps file. The
 code is to be found in G4OpenGLXView, and so is not bound
 to the Xm user. Also it needs fixing for some Mesa
 implementations, and the HP CDE environment manages to stuff
 things up when rendering to a pixmap (although CDE makes a
 mess of most other things as well, so this isn't
 disastrous).
 
 
 vis-00-01-08  21th July 1998  John Allison
 - Removed automatic refresh from /vis/camera/reset in G4VisCommandsCamera.cc.
 
 vis-00-01-07b  21th July 1998  Satoshi Tanaka
 - Revised G4FRSCENE::SendBoundingBox() so that
   zooming polycy of  DAWN drivers becomes consistent with
   OpenGL drivers
 
 vis-00-01-07  20th July 1998  John Allison
 - Corrected bug in G4VisManager::IsViewValid to trap drawing commands
   before geometry is available.
 
 vis-00-01-06  19th July 1998  John Allison
 - Default culling: culling - on, culling of invisible objects - on.
 - set/drawing_style does *not* change culling flags.
 - Minor bug fixes.
 
 vis-00-01-05  15th July 1998  John Allison
 - Cleaned up after name changes.
 - Minor bug fixes.
 
 vis-00-01-04  7th July 1998  Guy Barrand
 - Introduced interactivity.gmk into GNUmakefiles.
 
 vis-00-01-03  6th July 1998  John Allison
 - Changes for interface restructuring.
 - Simplified MyVisManager.
 
 vis-00-01-02  5th July 1998  John Allison
 - Changed visualization/GNUmakefile to use globlib.gmk.
 - Updated README for geant4beta.
 - Changed /vis~/draw/Ghosts to /vis~/draw/ghosts.
 
 vis-00-01-01  4th July 1998  John Allison
 - Moved G4VIS_BUILD.gmk and G4VIS_USE.gmk to geant4beta/config.
 - Changed /vis/ to /vis~/.
 
 3rd July 1998  John Allison
 - Small changes to test - see test/History.
 - Tidied.
 - Removed GNUmakefile.G4VIS_USE and make_list.sh.
 
 30th June 1998 - Paulo & Marc
 - added the G4FlavoredParallelWorldModel.hh file to
   visualization/modeling/include;
 - added the /vis~/draw/Ghosts [particle name] command
   in the G4VisManMessDraw.cc file;
 - added
   CPPFLAGS += -I$(G4BASE)/geometry/magneticfield/include and
   CPPFLAGS += -I$(G4BASE)/processes/parameterisation/include
   lines to GNUmakefile to compile G4VisManMessDraw.cc.
 
 geant4beta
 ============================================================
 geant4alpha
 
 vis-00-06-09  26th June 1998  John Allison
 - OPACS and Open Inventor - something about widget parents (GB)
 - Removed /new_vis/ commands.
 
 vis-00-06-08a  26th June 1998 Satoshi Tanaka
 - Updated G4VIS_USE.gmk
 - (1) Macro -DG4VIS_USE_DAWNFILE is made properly set
 - (2) G4VIS_USE_DAWN_ is renamed to G4VIS_USE_DAWN_OR_DAWNFILE
 - (3) G4VIS_USE_VRML_ is renamed to G4VIS_USE_VRML_OR_VRMLFILE
 
 vis-00-06-08  22nd June 1998  John Allison
 - Changed G4BASE = ../.. to G4BASE = $(shell (cd ../..; pwd))
 - Changed GNUmakefile.G4VIS_BUILD to G4VIS_BUILD.gmk
 
 vis-00-06-07  19th June 1998  John Allison
 - Defined G4_SOLVE_VIS_TEMPLATES in G4VIS_USE.gmk.  Needs
   the head version of GNUmakefile.architecture.
 - Consequential changes (improvements) to template handling in test19.cc
 - Some minor improvements in modeling.
 
 vis-00-06-06  11th June 1998  John Allison
 - Fixes to test_utils - see test/History.
 - Improvements in modeling - see modeling/History.
 
 vis-00-06-05  11th June 1998  Satoshi Tanaka
 - In G4VisManMessDraw.cc and G4VisManMessSet.cc , ...
   //    G4double unit = G4UIcommand::valueOf (unitString);
         G4double unit = G4UnitDefinition::GetValueOf (unitString);
 
 vis-00-06-04  10th June 1998  John Allison
 - Created G4VIS_USE.gmk to replace GNUmakefile.G4VIS_USE.
 - Changed test/GNUmakefile to use G4VIS_USE.gmk.
 - Separate libraries are now default in GNUmakefile.
 - Committed an interim version of README.
 - Moved G4BoundingSphereScene from management to modeling.
 - First attempt at defining the "scene" as lists of models.
 - Removed some unnecessary checks in G4VisManMess*.
 
 vis-00-06-03  27th May   1998  Satoshi Tanaka
 - DAWNFILE driver is added. It is to generate g4.prim file
   under the current directory.  And make DAWN or DAVID invoke
   using the g4.prim file as an input. For details, see the blackboard
   document.
 
 21st May 1998 Andy Walkden
 - Added hidden line removal code to G4OpenGLView. HLR utilises OpenGL's
   stencil buffer, but still the drawn lines are a little fragmented
   (an effect seen often when depth buffering is used to resolve pixel
   rendering disputes).
 - HLR requires wireframe rendering, filled polygon rendering and then wireframe
   rendering again. Hence, three visits to the kernel help to slow HLR
   rendering right down.
 
 vis-00-06-02  20th May   1998  Satoshi Tanaka
 - Added G4VisFeaturesOfDAWNFILE.hh, cc
 - Revised visualization/GNUmakefile, GNUmakefile.G4VIS_BUILD,
   GNUmakefile.G4VIS_USE
 - These are for DAWNFILE driver in preparation, which enables to
   invoke DAVID directly from Geant4.
 
 vis-00-06-01a 20th May   1998  Satoshi Tanaka
 - code refinement of FukuiRenderer driver
 
 vis-00-06-01  29th April 1998  John Allison
 - Introduced non-pure virtual functions
   Establish/DecommissionSpecials (G4PhysicalVolumeModel&) in
   G4VGraphicsScene with implementation of the former in G4VScene.
   Modified G4PhysicalVolumeModel to use it; also protected
   G4PhysicalVolumeModel against non-implementation of
   Establish/DecommissionSpecials.
 - Template instantiations in G4RayView made exclusive to GNU_GCC
 - Some minor changes under test - see test/History.
 
 27th April 1998 Andy Walkden
 - altered OpenGLView's structure a little. Now, G4OpenGLXmView is a
   type of (inherits from) G4OpenGLXView.
 - made code for haloing effects common to all OpenGL views.
 - changed XUnmapWindow in G4OpenGLXView::~G4OpenGLXView to XDestroyWindow
   (idea of Guy's)
 
 27th April 1998 Guy Barrand
 - vis/OPACS : remove Begin/EndModeling in G4GoScene.
 
 vis-00-05-06  23rd April 1998  John Allison
 - Changed test19.mac to test19.g4m and consequent change in test19.cc.
 - Fixed order of linking vis-a-vis -lG4track and -lG4tracking (GB).
 - Fixed inadvertent bug in test_utils/src/MyPhysicsList.cc.
 - Bug fix in G4OpenGLXmConvenienceRoutines.cc (GB).
 
 vis-00-05-05  21st April 1998  John Allison
 - Added run-time command line argument: test19 [<session-type>] [<verbosity>]
 - Removed #if GNU_GCC from template instantiation requests in test19.cc.
 - Added fDefaultTextVisAttributes to G4ViewParameters.
 - Added G4VScene::GetTextColour (changed G4FukuiRendererScene, G4GoScene and
   G4OpenInventorScene.
 - Changed default view parameters: culling on and invisible object culling on.
 - Tidied CreateScene/View.
 - Continued BaBar development.
 
 15th April 1998  John Allison
 - Added test/EucIntfce/, test/Bogus/ and test/babar_utils/ for BaBar test code.
   Also a new main() in BaBarCallListTest.cc.  Also a data file call_list.dat.
   See babar_utils/README.
 - Camera commands, except spin and orbit, no longer initiate draw.
 - Text is blue for time being (visible on black or white background.)
 
 15th April 1998 : Guy Barrand
 - From discussion with John and Simone G4VToolkit
   has been renamed to G4VInteractorManager.
 
 vis-00-05-04a  11th April 1998  Satoshi Tanaka
 - Code improvements in DAWN driver
 - (1) View parameters are sent to DAWN only at drawing times.
 - (2) Way of getting marker size are made simpler by using
 -     G4VScene::GetMarkerRadius ()  etc.
 
 vis-00-05-04  8th April 1998  John Allison
 - Small bug fix - then tag for Easter.
 
 HEAD  6th April 1998  John Allison
 - Added error printing to G4OpenGLScene::AddPrimitive (const G4Text& text).
 - Added /vis~/draw/text.
 - Added units to /vis~/draw/axes.
 - Began the job of restructuring vis commands; so there is a new class
   G4VisCommandsCameraMessengers for starters!
 
 HEAD  4th April 1998  John Allison
 - Removed automatic drawing after /vis~/set commands.  Now an explicit
   redraw is necessary, but it allows you to change parameters during
   building a view.  For example to superimpose projected hits on a
   section:
     /vis~/clear/view
     /vis~/set/section_plane on 0 0 20 cm 0 0 1
     /vis~/draw/current
     /vis~/set/section_plane off
     /run/beamOn
 - Fixed small bug in OpenGL for section drawing.
 - Made some small improvements in G4ViewParameters.
 
 vis-00-05-03  4th April 1998  John Allison
 - Re-engineered maintenance of current depth, etc.  Needed new method
   G4VGraphicsScene::BeginModeling (G4PhysicalVolumeModel&) in
   graphics_reps.  The result is much cleaner model and modeling
   parameters classes.  Also, the current depth, physical volume and
   logical volume are immediately available as protected pointers in
   G4VScene.
 - Required G4VScene::Begin/EndModeling to be invoked from subclass.
 - Introduced G4NullModel to hold modeling parameters.  This avoids
   having to create a G4VModel for each graphics primitive.
 
 HEAD  3rd April 1998  John Allison
 - Added GetMarkerDiameter/Radius to G4VScene.
 - Bug fix in G4VScene::GetMarkerSize.
 - Removed GetCurrentPhysicalVolume from G4PhysicalVolumeModel - now in
   G4ModelingParameters (but might move again soon!).
 - test/GNUmakefile now uses "$(MAKE) separate" for vis libraries.
 - test19 recognises argument "1" as a verbose flag value.
 
 HEAD April 2, 98 G.Barrand
 - Modifications for Win32/NT.
 - G4VIS_BUILD_[OIX, OIWIN32]_DRIVER, G4VIS_USE_[OIX, OIWIN32]
 
 vis-00-05-02  26th March 1998  John Allison
 - Added GetMarkerSize to G4VScene.
 - Made ~G4VisManager virtual.
 - Added current logical volume and current physical volume to working
   space in modeling parameters.  So it is no longer necessary to cast
   to G4PhysicalVolumeModel; all such casts removed.
 - Moved nested classes out of G4RayView.
 
 HEAD March 24, 98 G.Cosmo
 - Modified G4VisManMessExpert.cc to correctly use random numbers
   by calling directly G4UniformRand().
 
 HEAD March 24, 98 G.Barrand
 - GNUmakefile : MAKESHLIB changed in G4MAKESHLIB
 
 vis-00-05-01a  24 March 1998  Satoshi Tanaka
 - Geometry tree can be obtained by, e.g.,
   % grep PVName g4.prim > g4.tree
 
 vis-00-05-01  23rd March 1998  John Allison
 - Made RegisterGraphicsSystems pure virtual.
 - Added verbose level control to printing at initialization.
 - Fixed (hopefully) bug in scene deletion.
 - Made AddPrimitive (const G4Text/Circle/Square) pure virtual.
   (Had to add dummy void G4VRML1SCENE::AddPrimitive (const G4Text&).)
 - Made AddPrimitive (const G4Polymarker&) virtual again.
 - Opened some .hh files to G4VIS_USE flags.
 - Removed Pre/PostAddThis from some graphics systems (not OPACS, OI).
 - First implementation of G4ModelingParameters::hierarchy (DTREE).
 - Added Get Global/Current Tag/Description to G4VModel.
 - Introduced "working space" in G4ModelingParameters for geometry depth.
 - Relocated some template instantiation requests (might give trouble on DEC).
 
 vis-00-04-05a  16th March 1998  Satoshi Tanaka
 - DAWN driver outputs physical-volume names and copy number.
 
 vis-00-04-05  5th March 1998  John Allison
 - Added G4Text/Circle/Square in G4RayScene.hh.
 - Added G4Text/Circle/Square in G4BoundingSphereScene.hh.
 - Made AddPrimitive (const G4Polymarker&) non-virtual in G4VScene.hh.
 
 HEAD  5th March 1998  Andy Walkden
 - Implemented G4Circle/Square.
 - Added haloing to OpenGLXm "value added" options.
 
 HEAD  5th March 1998  S.Sadilov
 - visualization/GNUmakefile - using $OUT_LIB intoduced in
   GNUmakefile.architecture
 - visualization/management/GNUmakefile - compiling G4VisManMessSet.cc
   without optimization on WinNT
 
 vis-00-04-04a  5th March 1998  Satoshi TANAKA
 - Environmental variables  to customized DAWN driver is
   renamed from DAWN_... to G4DAWN_...
 - Default mode of DAWN driver is  EPS mode, i.e.
   mode in which EPS files are generated.
 
 vis-00-04-04  4th March 1998  John Allison
 - First tag with modeling under visualization.
   Here's what you need to do...
     cd prototype
     cvs update -A -d -P modeling
     cd visualization
     cvs update -r vis-00-04-04 -d -P
   Change the following lines in your GNUmakefile...
     CPPFLAGS += -I../../visualization/modeling/include
     LDFLAGS  += -L../../visualization/modeling/$(G4SYSTEM)
     Remove: @cd ../../modeling      &&   $(MAKE)
 
 vis-00-04-03  4th March 1998  John Allison
 - Last tag with modeling at same level as visualization.
 - Renamed near and far (VC++ keywords) in G4ViewParameters.cc.
 - Removed unnecessary #include <strstream.h> or adapted for WIN32.
 
 vis-00-04-02b  22nd February 1998  Satoshi Tanaka
 - Split G4VIS_BUILD_VRML1_DRIVER into G4VIS_BUILD_VRML_DRIVER
                                  and  G4VIS_BUILD_VRMLFILE_DRIVER.
 - Split G4VIS_USE_VRML1          into G4VIS_USE_VRML
                                  and  G4VIS_USE_VRMLFILE.
 
 vis-00-04-02a  18th February 1998  John Allison
 - Bug fix in G4RayView!
 
 vis-00-04-02  18th February 1998  John Allison
 - Introduced /vis~/set/section_plane.
 
 vis-00-04-01  13th February 1998  John Allison
 - Made messengers compatible with the new style.
 
 vis-00-03-02a  3rd February 1998  John Allison
 - Bug fix for 02.
 - Changed GNUmakefile to use processes sub-libraries.
 
 vis-00-03-02  2nd February 1998  John Allison
 - Modernised messengers.
 
 vis-00-03-01a 29th January 1998  John Allison
 - Tagged a few improvement in OpenGL
 
 vis-00-03-01 26th January 1998  John Allison
 - Old environment variables abandoned - see visualization/README.
 - G4VisManager is now instantiated *and* deleted in main().
 - G4VisRegisterGraphicsSystem.icc replaced by
   MyVisManager::RegisterGraphicsSystems as a way - now optional - of
   a user overriding the default graphics system registration.
 
 Januray 20 , 98 G. Barrand
 
 - Implement object rotation in OPACS driver
 
 Januray 19 , 98 G. Barrand
 
 - Correct OpenInventor code so that it is ANSI-C++
   and then compiles with OSF1/cxx, HP-UX/aCC.
 
 7th January 1998  John Allison
 - Restructuring to use modeling category.
 
 December 19, 97 G. Cosmo - (alpha03)
 
 - 1st December 1997 - John Allison.
 - This is interim code for testing by the visualization
   group and it will be tagged soon.  You must update to the
   head of graphics_reps and visualization simulatanouesly.
   It coworks (I hope - it's difficult to be 100% sure about
   this since I have a few changes for other categories in
   the pipeline - see previous email) with:
     digits+hits              digi-00-02-01
     events+tracks            event-00-02-01
     geometry                 HEAD
     global                   global-00-02-01
     intercoms                intercoms-00-02-01
     interfaces               interfaces-00-02-01
     particle+matter          piim-00-02-01
     run                      run-00-02-01
     track                    track-00-02-01
     tracking                 tracking-00-02-01
 - Addition of:
     visualization/GNUmakefile.transition_to_G4VIS_BUILD
     visualization/GNUmakefile.transition_to_G4VIS_USE
     visualization/GNUmakefile.vis_cppflags_for_G4VIS_USE
   to turn the existing environment variables into the
   to-be-adopted G4VIS_... variables - see visualization/test/README.
 - Consequent changes to other visualization GNUmakefiles.
 - New way of instantiating graphics systems:
   Set the appropriate environment variables and include and
   compile G4VisRegisterGraphicsSystems.icc in your main():
     ...
     #include G4VisRegisterGraphicsSystems.icc
     ...
     main() {
       ...
 - Added G4VisFeaturesOfXXX files which simple return a G4String.
  (Guy, Jeff, would you like to join this scheme?)
 - Added commands /vis~/delete/scene and /vis~/delete/view.
 - Added /vis~/show/view to test19.odb.
 
 vis-00-02-01 to vis-00-02-05a not logged!!!
 
 vis-00-01-02  13th July 1997  John Allison
 - Consolidation of previous tag.
 
 vis-00-01-01  8th June 1997  John Allison
 - First systematic tag.
 - G4Ray introduced.