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1 =========================================================
2 Geant4 - an Object-Oriented Toolkit for Simulation in HEP
3 =========================================================
4
5 examples/extended/visualization/standalone
6 ------------------------------------------
7
8 This example illustrates how one might use the Geant4 Visualization
9 System as a "standalone" graphics library and viewer, i.e, without
10 the overhead of the run manager and all the actions and physics.
11
12 It makes use of the "user action" feature of the Geant4 vis manager - for
13 a simple example see examples/extended/visualization/userVisAction. You
14 have to encapsulate your drawing in a vis action so that the vis manager
15 can call it and re-call it as appropriate.
16
17 1) Define a G4VUserVisAction that implements a Draw method. Two
18 examples are provided:
19 - StandaloneVisAction:
20 - a simple box;
21 - a Boolean solid;
22 - an alternative way of drawing a solid by obtaining the
23 polyhedral representation (included for interest, not as a
24 recommendation).
25 - DrawGeometryVisAction:
26 - Shows how to visualise your geometry alone, i.e., without the
27 run manager and the physics stuff.
28
29 2) In the main program, the vis actions must be instantiated and
30 registered with the visualization manager. You may (optionally)
31 specify an extent to assist the viewers to locate the objects.
32
33 3) To visualise, you need:
34 - /vis/scene/add/userAction
35
36 4) Use the usual Geant4 vis commands to create a scene
37 and view (including the above command) - see standalone.mac.
38
39 Note: The system needs an "extent" in order to point the virtual
40 camera and adjust its field of view, etc. This defines the "standard
41 view". You may zoom, etc., from this standard view. The extent may
42 be specified as suggested above or by using /vis/scene/add/extent.
43
44
45 John Allison
46 30th December 2022
