Geant4 Cross Reference

Cross-Referencing   Geant4
Geant4/geometry/navigation/src/G4PropagatorInField.cc

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Differences between /geometry/navigation/src/G4PropagatorInField.cc (Version 11.3.0) and /geometry/navigation/src/G4PropagatorInField.cc (Version 10.6)


  1 //                                                  1 //
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 24 // *******************************************     24 // ********************************************************************
 25 //                                                 25 //
 26 // class G4PropagatorInField Implementation        26 // class G4PropagatorInField Implementation
 27 //                                                 27 // 
 28 //  This class implements an algorithm to trac     28 //  This class implements an algorithm to track a particle in a
 29 //  non-uniform magnetic field. It utilises an     29 //  non-uniform magnetic field. It utilises an ODE solver (with
 30 //  the Runge - Kutta method) to evolve the pa     30 //  the Runge - Kutta method) to evolve the particle, and drives it
 31 //  until the particle has traveled a set dist     31 //  until the particle has traveled a set distance or it enters a new 
 32 //  volume.                                        32 //  volume.
 33 //                                                 33 //                                                                     
 34 // 14.10.96 John Apostolakis, design and imple     34 // 14.10.96 John Apostolakis, design and implementation
 35 // 17.03.97 John Apostolakis, renaming new set     35 // 17.03.97 John Apostolakis, renaming new set functions being added
 36 // -------------------------------------------     36 // ---------------------------------------------------------------------------
 37                                                    37 
 38 #include <iomanip>                                 38 #include <iomanip>
 39                                                    39 
 40 #include "G4PropagatorInField.hh"                  40 #include "G4PropagatorInField.hh"
 41 #include "G4ios.hh"                                41 #include "G4ios.hh"
 42 #include "G4SystemOfUnits.hh"                      42 #include "G4SystemOfUnits.hh"
 43 #include "G4ThreeVector.hh"                        43 #include "G4ThreeVector.hh"
 44 #include "G4Material.hh"                           44 #include "G4Material.hh"
 45 #include "G4VPhysicalVolume.hh"                    45 #include "G4VPhysicalVolume.hh"
 46 #include "G4Navigator.hh"                          46 #include "G4Navigator.hh"
 47 #include "G4GeometryTolerance.hh"                  47 #include "G4GeometryTolerance.hh"
 48 #include "G4VCurvedTrajectoryFilter.hh"            48 #include "G4VCurvedTrajectoryFilter.hh"
 49 #include "G4ChordFinder.hh"                        49 #include "G4ChordFinder.hh"
 50 #include "G4MultiLevelLocator.hh"                  50 #include "G4MultiLevelLocator.hh"
 51                                                    51 
 52                                                << 
 53 // -------------------------------------------     52 // ---------------------------------------------------------------------------
 54 // Constructors and destructor                     53 // Constructors and destructor
 55 //                                                 54 //
 56 G4PropagatorInField::G4PropagatorInField( G4Na     55 G4PropagatorInField::G4PropagatorInField( G4Navigator* theNavigator, 
 57                                           G4Fi     56                                           G4FieldManager* detectorFieldMgr,
 58                                           G4VI     57                                           G4VIntersectionLocator* vLocator  )
 59   : fDetectorFieldMgr(detectorFieldMgr),           58   : fDetectorFieldMgr(detectorFieldMgr), 
 60     fNavigator(theNavigator),                      59     fNavigator(theNavigator),
 61     fCurrentFieldMgr(detectorFieldMgr),            60     fCurrentFieldMgr(detectorFieldMgr),
 62     End_PointAndTangent(G4ThreeVector(0.,0.,0.     61     End_PointAndTangent(G4ThreeVector(0.,0.,0.),
 63                         G4ThreeVector(0.,0.,0.     62                         G4ThreeVector(0.,0.,0.),0.0,0.0,0.0,0.0,0.0)
 64 {                                                  63 {
 65   fEpsilonStep = (fDetectorFieldMgr != nullptr     64   fEpsilonStep = (fDetectorFieldMgr != nullptr)
 66                ? fDetectorFieldMgr->GetMaximum     65                ? fDetectorFieldMgr->GetMaximumEpsilonStep() : 1.0e-5;
 67                                                <<  66   fLargestAcceptableStep = 1000.0 * meter;
 68                                                    67 
 69   fPreviousSftOrigin = G4ThreeVector(0.,0.,0.)     68   fPreviousSftOrigin = G4ThreeVector(0.,0.,0.);
 70   kCarTolerance = G4GeometryTolerance::GetInst     69   kCarTolerance = G4GeometryTolerance::GetInstance()->GetSurfaceTolerance();
 71   fZeroStepThreshold = std::max( 1.0e5 * kCarT     70   fZeroStepThreshold = std::max( 1.0e5 * kCarTolerance, 1.0e-1 * micrometer );
 72                                                    71 
 73   fLargestAcceptableStep = 100.0 * meter;  //  << 
 74   fMaxStepSizeMultiplier=   0.1 ;   // 0.1 in  << 
 75   fMinBigDistance= 100. * CLHEP::mm;           << 
 76 #ifdef G4DEBUG_FIELD                               72 #ifdef G4DEBUG_FIELD
 77   G4cout << " PiF: Zero Step Threshold set to      73   G4cout << " PiF: Zero Step Threshold set to "
 78          << fZeroStepThreshold / millimeter        74          << fZeroStepThreshold / millimeter
 79          << " mm." << G4endl;                      75          << " mm." << G4endl;
 80   G4cout << " PiF:   Value of kCarTolerance =      76   G4cout << " PiF:   Value of kCarTolerance = "
 81          << kCarTolerance / millimeter             77          << kCarTolerance / millimeter 
 82          << " mm. " << G4endl;                     78          << " mm. " << G4endl;
 83   fVerboseLevel = 2;                               79   fVerboseLevel = 2;
 84   fVerbTracePiF = true;                            80   fVerbTracePiF = true;   
 85 #endif                                             81 #endif 
 86                                                    82 
 87   // Defining Intersection Locator and his par     83   // Defining Intersection Locator and his parameters
 88   if ( vLocator == nullptr )                       84   if ( vLocator == nullptr )
 89   {                                                85   {
 90     fIntersectionLocator = new G4MultiLevelLoc     86     fIntersectionLocator = new G4MultiLevelLocator(theNavigator);
 91     fAllocatedLocator = true;                      87     fAllocatedLocator = true;
 92   }                                                88   }
 93   else                                             89   else
 94   {                                                90   {
 95     fIntersectionLocator = vLocator;               91     fIntersectionLocator = vLocator;
 96     fAllocatedLocator = false;                     92     fAllocatedLocator = false;
 97   }                                                93   }
 98   RefreshIntersectionLocator();  //  Copy all      94   RefreshIntersectionLocator();  //  Copy all relevant parameters
 99 }                                                  95 }
100                                                    96 
101 // -------------------------------------------     97 // ---------------------------------------------------------------------------
102 //                                                 98 //
103 G4PropagatorInField::~G4PropagatorInField()        99 G4PropagatorInField::~G4PropagatorInField()
104 {                                                 100 {
105   if(fAllocatedLocator)  { delete  fIntersecti    101   if(fAllocatedLocator)  { delete  fIntersectionLocator; }
106 }                                                 102 }
107                                                   103 
108 // -------------------------------------------    104 // ---------------------------------------------------------------------------
109 // Update the IntersectionLocator with current    105 // Update the IntersectionLocator with current parameters
110 //                                                106 //
111 void G4PropagatorInField::RefreshIntersectionL    107 void G4PropagatorInField::RefreshIntersectionLocator()
112 {                                                 108 {
113   fIntersectionLocator->SetEpsilonStepFor(fEps    109   fIntersectionLocator->SetEpsilonStepFor(fEpsilonStep);
114   fIntersectionLocator->SetDeltaIntersectionFo    110   fIntersectionLocator->SetDeltaIntersectionFor(fCurrentFieldMgr->GetDeltaIntersection());
115   fIntersectionLocator->SetChordFinderFor(GetC    111   fIntersectionLocator->SetChordFinderFor(GetChordFinder());
116   fIntersectionLocator->SetSafetyParametersFor    112   fIntersectionLocator->SetSafetyParametersFor( fUseSafetyForOptimisation);
117 }                                                 113 }
118                                                   114 
119 // -------------------------------------------    115 // ---------------------------------------------------------------------------
120 // Compute the next geometric Step                116 // Compute the next geometric Step
121 //                                                117 //
122 G4double G4PropagatorInField::ComputeStep(        118 G4double G4PropagatorInField::ComputeStep(
123                 G4FieldTrack&      pFieldTrack    119                 G4FieldTrack&      pFieldTrack,
124                 G4double           CurrentProp    120                 G4double           CurrentProposedStepLength,
125                 G4double&          currentSafe    121                 G4double&          currentSafety,                // IN/OUT
126                 G4VPhysicalVolume* pPhysVol,      122                 G4VPhysicalVolume* pPhysVol,
127                 G4bool             canRelaxDel    123                 G4bool             canRelaxDeltaChord)
128 {                                                 124 {  
129   GetChordFinder()->OnComputeStep(&pFieldTrack << 125   GetChordFinder()->OnComputeStep();
130   const G4double deltaChord = GetChordFinder()    126   const G4double deltaChord = GetChordFinder()->GetDeltaChord();
131                                                   127 
132   // If CurrentProposedStepLength is too small    128   // If CurrentProposedStepLength is too small for finding Chords
133   // then return with no action (for now - TOD    129   // then return with no action (for now - TODO: some action)
134   //                                              130   //
135   const char* methodName = "G4PropagatorInFiel    131   const char* methodName = "G4PropagatorInField::ComputeStep";
136   if (CurrentProposedStepLength<kCarTolerance)    132   if (CurrentProposedStepLength<kCarTolerance)
137   {                                               133   {
138     return kInfinity;                             134     return kInfinity;
139   }                                               135   }
140                                                   136 
141   // Introducing smooth trajectory display (ja    137   // Introducing smooth trajectory display (jacek 01/11/2002)
142   //                                              138   //
143   if (fpTrajectoryFilter != nullptr)           << 139   if (fpTrajectoryFilter)
144   {                                               140   {
145     fpTrajectoryFilter->CreateNewTrajectorySeg    141     fpTrajectoryFilter->CreateNewTrajectorySegment();
146   }                                               142   }
147                                                   143 
148   fFirstStepInVolume = fNewTrack ? true : fLas    144   fFirstStepInVolume = fNewTrack ? true : fLastStepInVolume;
149   fLastStepInVolume = false;                      145   fLastStepInVolume = false;
150   fNewTrack = false;                              146   fNewTrack = false; 
151                                                   147 
152   if( fVerboseLevel > 2 )                         148   if( fVerboseLevel > 2 )
153   {                                               149   {
154     G4cout << methodName << " called" << G4end    150     G4cout << methodName << " called" << G4endl;
155     G4cout << "   Starting FT: " << pFieldTrac    151     G4cout << "   Starting FT: " << pFieldTrack;
156     G4cout << "   Requested length = " << Curr    152     G4cout << "   Requested length = " << CurrentProposedStepLength << G4endl;
157     G4cout << "   PhysVol = ";                    153     G4cout << "   PhysVol = ";
158     if( pPhysVol != nullptr )                  << 154     if( pPhysVol )
159     {                                          << 
160        G4cout << pPhysVol->GetName() << G4endl    155        G4cout << pPhysVol->GetName() << G4endl;
161     }                                          << 
162     else                                          156     else
163     {                                          << 
164        G4cout << " N/A ";                         157        G4cout << " N/A ";
165     }                                          << 
166     G4cout << G4endl;                             158     G4cout << G4endl;
167   }                                               159   }
168                                                   160   
169   // Parameters for adaptive Runge-Kutta integ    161   // Parameters for adaptive Runge-Kutta integration
170                                                   162   
171   G4double h_TrialStepSize;        // 1st Step    163   G4double h_TrialStepSize;        // 1st Step Size 
172   G4double TruePathLength = CurrentProposedSte    164   G4double TruePathLength = CurrentProposedStepLength;
173   G4double StepTaken = 0.0;                       165   G4double StepTaken = 0.0; 
174   G4double s_length_taken, epsilon;               166   G4double s_length_taken, epsilon; 
175   G4bool   intersects;                            167   G4bool   intersects;
176   G4bool   first_substep = true;                  168   G4bool   first_substep = true;
177                                                   169 
178   G4double NewSafety;                             170   G4double NewSafety;
179   fParticleIsLooping = false;                     171   fParticleIsLooping = false;
180                                                   172 
181   // If not yet done,                             173   // If not yet done, 
182   //   Set the field manager to the local  one    174   //   Set the field manager to the local  one if the volume has one, 
183   //                      or to the global one    175   //                      or to the global one if not
184   //                                              176   //
185   if( !fSetFieldMgr )                             177   if( !fSetFieldMgr )
186   {                                               178   {
187     fCurrentFieldMgr = FindAndSetFieldManager(    179     fCurrentFieldMgr = FindAndSetFieldManager( pPhysVol );
188   }                                               180   }
189   fSetFieldMgr = false; // For next call, the     181   fSetFieldMgr = false; // For next call, the field manager must be set again
190                                                   182 
191   G4FieldTrack CurrentState(pFieldTrack);         183   G4FieldTrack CurrentState(pFieldTrack);
192   G4FieldTrack OriginalState = CurrentState;      184   G4FieldTrack OriginalState = CurrentState;
193                                                   185 
194   // If the Step length is "infinite", then an    186   // If the Step length is "infinite", then an approximate-maximum Step
195   // length (used to calculate the relative ac    187   // length (used to calculate the relative accuracy) must be guessed
196   //                                              188   //
197   if( CurrentProposedStepLength >= fLargestAcc    189   if( CurrentProposedStepLength >= fLargestAcceptableStep )
198   {                                               190   {
199     G4ThreeVector StartPointA, VelocityUnit;      191     G4ThreeVector StartPointA, VelocityUnit;
200     StartPointA  = pFieldTrack.GetPosition();     192     StartPointA  = pFieldTrack.GetPosition();
201     VelocityUnit = pFieldTrack.GetMomentumDir(    193     VelocityUnit = pFieldTrack.GetMomentumDir();
202                                                   194 
203     G4double trialProposedStep = fMaxStepSizeM << 195     G4double trialProposedStep = 1.e2 * ( 10.0 * cm + 
204       fNavigator->GetWorldVolume()->GetLogical    196       fNavigator->GetWorldVolume()->GetLogicalVolume()->
205                   GetSolid()->DistanceToOut(St    197                   GetSolid()->DistanceToOut(StartPointA, VelocityUnit) );
206     CurrentProposedStepLength = std::min( tria    198     CurrentProposedStepLength = std::min( trialProposedStep,
207                                           fLar    199                                           fLargestAcceptableStep ); 
208   }                                               200   }
209   epsilon = fCurrentFieldMgr->GetDeltaOneStep(    201   epsilon = fCurrentFieldMgr->GetDeltaOneStep() / CurrentProposedStepLength;
210   G4double epsilonMin= fCurrentFieldMgr->GetMi    202   G4double epsilonMin= fCurrentFieldMgr->GetMinimumEpsilonStep();
211   G4double epsilonMax= fCurrentFieldMgr->GetMa    203   G4double epsilonMax= fCurrentFieldMgr->GetMaximumEpsilonStep();
212   if( epsilon < epsilonMin )  { epsilon = epsi    204   if( epsilon < epsilonMin )  { epsilon = epsilonMin; }
213   if( epsilon > epsilonMax )  { epsilon = epsi    205   if( epsilon > epsilonMax )  { epsilon = epsilonMax; }
214   SetEpsilonStep( epsilon );                      206   SetEpsilonStep( epsilon );
215                                                   207 
216   // Values for Intersection Locator has to be    208   // Values for Intersection Locator has to be updated on each call for the
217   // case that CurrentFieldManager has changed    209   // case that CurrentFieldManager has changed from the one of previous step
218   //                                              210   //
219   RefreshIntersectionLocator();                   211   RefreshIntersectionLocator();
220                                                   212 
221   // Shorten the proposed step in case of earl    213   // Shorten the proposed step in case of earlier problems (zero steps)
222   //                                              214   // 
223   if( fNoZeroStep > fActionThreshold_NoZeroSte    215   if( fNoZeroStep > fActionThreshold_NoZeroSteps )
224   {                                               216   {
225     G4double stepTrial;                           217     G4double stepTrial;
226                                                   218 
227     stepTrial = fFull_CurveLen_of_LastAttempt;    219     stepTrial = fFull_CurveLen_of_LastAttempt; 
228     if( (stepTrial <= 0.0) && (fLast_ProposedS    220     if( (stepTrial <= 0.0) && (fLast_ProposedStepLength > 0.0) )
229     {                                             221     {
230       stepTrial = fLast_ProposedStepLength;       222       stepTrial = fLast_ProposedStepLength; 
231     }                                             223     }
232                                                   224 
233     G4double decreaseFactor = 0.9; // Unused d    225     G4double decreaseFactor = 0.9; // Unused default
234     if(   (fNoZeroStep < fSevereActionThreshol    226     if(   (fNoZeroStep < fSevereActionThreshold_NoZeroSteps)
235        && (stepTrial > 100.0*fZeroStepThreshol    227        && (stepTrial > 100.0*fZeroStepThreshold) )
236     {                                             228     {
237       // Attempt quick convergence                229       // Attempt quick convergence
238       //                                          230       //
239       decreaseFactor= 0.25;                       231       decreaseFactor= 0.25;
240     }                                             232     } 
241     else                                          233     else
242     {                                             234     {
243       // We are in significant difficulties, p    235       // We are in significant difficulties, probably at a boundary that
244       // is either geometrically sharp or betw    236       // is either geometrically sharp or between very different materials.
245       // Careful decreases to cope with tolera    237       // Careful decreases to cope with tolerance are required
246       //                                          238       //
247       if( stepTrial > 100.0*fZeroStepThreshold << 239       if( stepTrial > 100.0*fZeroStepThreshold )
248         decreaseFactor = 0.35;     // Try decr    240         decreaseFactor = 0.35;     // Try decreasing slower
249       } else if( stepTrial > 30.0*fZeroStepThr << 241       else if( stepTrial > 30.0*fZeroStepThreshold )
250         decreaseFactor= 0.5;       // Try yet     242         decreaseFactor= 0.5;       // Try yet slower decrease
251       } else if( stepTrial > 10.0*fZeroStepThr << 243       else if( stepTrial > 10.0*fZeroStepThreshold )
252         decreaseFactor= 0.75;      // Try even    244         decreaseFactor= 0.75;      // Try even slower decreases
253       } else {                                 << 245       else
254         decreaseFactor= 0.9;       // Try very    246         decreaseFactor= 0.9;       // Try very slow decreases
255       }                                        << 
256      }                                            247      }
257      stepTrial *= decreaseFactor;                 248      stepTrial *= decreaseFactor;
258                                                   249 
259 #ifdef G4DEBUG_FIELD                              250 #ifdef G4DEBUG_FIELD
260      if( fVerboseLevel > 2                        251      if( fVerboseLevel > 2
261       || (fNoZeroStep >= fSevereActionThreshol    252       || (fNoZeroStep >= fSevereActionThreshold_NoZeroSteps) )
262      {                                            253      {
263         G4cerr << " " << methodName               254         G4cerr << " " << methodName
264                << "  Decreasing step after " <    255                << "  Decreasing step after " << fNoZeroStep << " zero steps "
265                << " - in volume " << pPhysVol;    256                << " - in volume " << pPhysVol;
266         if( pPhysVol )                            257         if( pPhysVol )
267            G4cerr << " with name " << pPhysVol    258            G4cerr << " with name " << pPhysVol->GetName();
268         else                                      259         else
269            G4cerr << " i.e. *unknown* volume."    260            G4cerr << " i.e. *unknown* volume.";
270         G4cerr << G4endl;                         261         G4cerr << G4endl;
271         PrintStepLengthDiagnostic(CurrentPropo    262         PrintStepLengthDiagnostic(CurrentProposedStepLength, decreaseFactor,
272                                   stepTrial, p    263                                   stepTrial, pFieldTrack);
273      }                                            264      }
274 #endif                                            265 #endif
275      if( stepTrial == 0.0 )  //  Change to mak    266      if( stepTrial == 0.0 )  //  Change to make it < 0.1 * kCarTolerance ??
276      {                                            267      {
277        std::ostringstream message;                268        std::ostringstream message;
278        message << "Particle abandoned due to l    269        message << "Particle abandoned due to lack of progress in field."
279                << G4endl                          270                << G4endl
280                << "  Properties : " << pFieldT    271                << "  Properties : " << pFieldTrack << G4endl
281                << "  Attempting a zero step =     272                << "  Attempting a zero step = " << stepTrial << G4endl
282                << "  while attempting to progr    273                << "  while attempting to progress after " << fNoZeroStep
283                << " trial steps. Will abandon     274                << " trial steps. Will abandon step.";
284        G4Exception(methodName, "GeomNav1002",     275        G4Exception(methodName, "GeomNav1002", JustWarning, message);
285        fParticleIsLooping = true;                 276        fParticleIsLooping = true;
286        return 0;  // = stepTrial;                 277        return 0;  // = stepTrial;
287      }                                            278      }
288      if( stepTrial < CurrentProposedStepLength    279      if( stepTrial < CurrentProposedStepLength )
289      {                                            280      {
290        CurrentProposedStepLength = stepTrial;     281        CurrentProposedStepLength = stepTrial;
291      }                                            282      }
292   }                                               283   }
293   fLast_ProposedStepLength = CurrentProposedSt    284   fLast_ProposedStepLength = CurrentProposedStepLength;
294                                                   285 
295   G4int do_loop_count = 0;                        286   G4int do_loop_count = 0; 
296   do  // Loop checking, 07.10.2016, JA            287   do  // Loop checking, 07.10.2016, JA
297   {                                               288   { 
298     G4FieldTrack SubStepStartState = CurrentSt    289     G4FieldTrack SubStepStartState = CurrentState;
299     G4ThreeVector SubStartPoint = CurrentState    290     G4ThreeVector SubStartPoint = CurrentState.GetPosition(); 
300                                                   291     
301     if(!first_substep)                            292     if(!first_substep)
302     {                                             293     {
303       if( fVerboseLevel > 4 )                     294       if( fVerboseLevel > 4 )
304       {                                           295       {
305         G4cout << " PiF: Calling Nav/Locate Gl    296         G4cout << " PiF: Calling Nav/Locate Global Point within-Volume "
306                << G4endl;                         297                << G4endl;
307       }                                           298       }
308       fNavigator->LocateGlobalPointWithinVolum    299       fNavigator->LocateGlobalPointWithinVolume( SubStartPoint );
309     }                                             300     }
310                                                   301 
311     // How far to attempt to move the particle    302     // How far to attempt to move the particle !
312     //                                            303     //
313     h_TrialStepSize = CurrentProposedStepLengt    304     h_TrialStepSize = CurrentProposedStepLength - StepTaken;
314                                                   305 
315     if (canRelaxDeltaChord &&                     306     if (canRelaxDeltaChord &&
316         fIncreaseChordDistanceThreshold > 0  &    307         fIncreaseChordDistanceThreshold > 0  &&
317         do_loop_count > fIncreaseChordDistance    308         do_loop_count > fIncreaseChordDistanceThreshold && 
318         do_loop_count % fIncreaseChordDistance    309         do_loop_count % fIncreaseChordDistanceThreshold == 0)
319     {                                             310     {
320         GetChordFinder()->SetDeltaChord(          311         GetChordFinder()->SetDeltaChord(
321           GetChordFinder()->GetDeltaChord() *     312           GetChordFinder()->GetDeltaChord() * 2.0
322         );                                        313         );
323     }                                             314     }
324                                                   315 
325     // Integrate as far as "chord miss" rule a    316     // Integrate as far as "chord miss" rule allows.
326     //                                            317     //
327     s_length_taken = GetChordFinder()->Advance    318     s_length_taken = GetChordFinder()->AdvanceChordLimited( 
328                              CurrentState,        319                              CurrentState,    // Position & velocity
329                              h_TrialStepSize,     320                              h_TrialStepSize,
330                              fEpsilonStep,        321                              fEpsilonStep,
331                              fPreviousSftOrigi    322                              fPreviousSftOrigin,
332                              fPreviousSafety )    323                              fPreviousSafety );
333       // CurrentState is now updated with the     324       // CurrentState is now updated with the final position and velocity
334                                                   325 
335     fFull_CurveLen_of_LastAttempt = s_length_t    326     fFull_CurveLen_of_LastAttempt = s_length_taken;
336                                                   327 
337     G4ThreeVector EndPointB = CurrentState.Get    328     G4ThreeVector EndPointB = CurrentState.GetPosition(); 
338     G4ThreeVector InterSectionPointE;             329     G4ThreeVector InterSectionPointE;
339     G4double      LinearStepLength;               330     G4double      LinearStepLength;
340                                                   331  
341     // Intersect chord AB with geometry           332     // Intersect chord AB with geometry
342     //                                            333     //
343     intersects= IntersectChord( SubStartPoint,    334     intersects= IntersectChord( SubStartPoint, EndPointB, 
344                                 NewSafety, Lin    335                                 NewSafety, LinearStepLength, 
345                                 InterSectionPo    336                                 InterSectionPointE );
346       // E <- Intersection Point of chord AB a    337       // E <- Intersection Point of chord AB and either volume A's surface 
347       //                                  or a    338       //                                  or a daughter volume's surface ..
348                                                   339 
349     if( first_substep )                           340     if( first_substep )
350     {                                             341     { 
351        currentSafety = NewSafety;                 342        currentSafety = NewSafety;
352     } // Updating safety in other steps is pot    343     } // Updating safety in other steps is potential future extention
353                                                   344 
354     if( intersects )                              345     if( intersects )
355     {                                             346     {
356        G4FieldTrack IntersectPointVelct_G(Curr    347        G4FieldTrack IntersectPointVelct_G(CurrentState);  // FT-Def-Construct
357                                                   348 
358        // Find the intersection point of AB tr    349        // Find the intersection point of AB true path with the surface
359        //   of vol(A), if it exists. Start wit    350        //   of vol(A), if it exists. Start with point E as first "estimate".
360        G4bool recalculatedEndPt = false;          351        G4bool recalculatedEndPt = false;
361                                                   352        
362        G4bool found_intersection = fIntersecti    353        G4bool found_intersection = fIntersectionLocator->
363          EstimateIntersectionPoint( SubStepSta    354          EstimateIntersectionPoint( SubStepStartState, CurrentState, 
364                                     InterSecti    355                                     InterSectionPointE, IntersectPointVelct_G,
365                                     recalculat    356                                     recalculatedEndPt, fPreviousSafety,
366                                     fPreviousS    357                                     fPreviousSftOrigin);
367        intersects = found_intersection;           358        intersects = found_intersection;
368        if( found_intersection )                   359        if( found_intersection )
369        {                                          360        {        
370           End_PointAndTangent= IntersectPointV    361           End_PointAndTangent= IntersectPointVelct_G;  // G is our EndPoint ...
371           StepTaken = TruePathLength = Interse    362           StepTaken = TruePathLength = IntersectPointVelct_G.GetCurveLength()
372                                      - Origina    363                                      - OriginalState.GetCurveLength();
373        }                                          364        }
374        else                                       365        else
375        {                                          366        {
376           // Either "minor" chords do not inte    367           // Either "minor" chords do not intersect
377           // or else stopped (due to too many     368           // or else stopped (due to too many steps)
378           //                                      369           //
379           if( recalculatedEndPt )                 370           if( recalculatedEndPt )
380           {                                       371           {
381              G4double endAchieved = IntersectP    372              G4double endAchieved = IntersectPointVelct_G.GetCurveLength();
382              G4double endExpected = CurrentSta    373              G4double endExpected = CurrentState.GetCurveLength(); 
383                                                   374 
384              // Detect failure - due to too ma    375              // Detect failure - due to too many steps
385              G4bool shortEnd = endAchieved        376              G4bool shortEnd = endAchieved
386                              < (endExpected*(1    377                              < (endExpected*(1.0-CLHEP::perMillion));
387                                                   378 
388              G4double stepAchieved = endAchiev    379              G4double stepAchieved = endAchieved
389                                    - SubStepSt    380                                    - SubStepStartState.GetCurveLength();
390                                                   381 
391              // Update remaining state - must     382              // Update remaining state - must work for 'full' step or
392              // abandonned intersection           383              // abandonned intersection
393              //                                   384              //
394              CurrentState = IntersectPointVelc    385              CurrentState = IntersectPointVelct_G;
395              s_length_taken = stepAchieved;       386              s_length_taken = stepAchieved;
396              if( shortEnd )                       387              if( shortEnd )
397              {                                    388              {
398                 fParticleIsLooping = true;        389                 fParticleIsLooping = true;
399              }                                    390              } 
400           }                                       391           }
401        }                                          392        }
402     }                                             393     }
403     if( !intersects )                             394     if( !intersects )
404     {                                             395     {
405       StepTaken += s_length_taken;                396       StepTaken += s_length_taken;
406                                                   397 
407       if (fpTrajectoryFilter != nullptr) // Fo << 398       if (fpTrajectoryFilter) // For smooth trajectory display (jacek 1/11/2002)
408       {                                           399       {
409         fpTrajectoryFilter->TakeIntermediatePo    400         fpTrajectoryFilter->TakeIntermediatePoint(CurrentState.GetPosition());
410       }                                           401       }
411     }                                             402     }
412     first_substep = false;                        403     first_substep = false;
413                                                   404 
414 #ifdef G4DEBUG_FIELD                              405 #ifdef G4DEBUG_FIELD
415     if( fNoZeroStep > fActionThreshold_NoZeroS    406     if( fNoZeroStep > fActionThreshold_NoZeroSteps )
416     {                                             407     {
417       if( fNoZeroStep > fSevereActionThreshold    408       if( fNoZeroStep > fSevereActionThreshold_NoZeroSteps )
418         G4cout << " Above 'Severe Action' thre    409         G4cout << " Above 'Severe Action' threshold -- for Zero steps.  ";
419       else                                        410       else
420         G4cout << " Above 'action' threshold -    411         G4cout << " Above 'action' threshold -- for Zero steps.  ";         
421       G4cout << " Number of zero steps = " <<     412       G4cout << " Number of zero steps = " << fNoZeroStep << G4endl;
422       printStatus( SubStepStartState,  // or O    413       printStatus( SubStepStartState,  // or OriginalState,
423                    CurrentState, CurrentPropos    414                    CurrentState, CurrentProposedStepLength, 
424                    NewSafety, do_loop_count, p    415                    NewSafety, do_loop_count, pPhysVol );
425     }                                             416     }
426     if( (fVerboseLevel > 1) && (do_loop_count     417     if( (fVerboseLevel > 1) && (do_loop_count > fMax_loop_count-10 ))
427     {                                             418     {
428       if( do_loop_count == fMax_loop_count-9 )    419       if( do_loop_count == fMax_loop_count-9 )
429       {                                           420       {
430         G4cout << " G4PropagatorInField::Compu    421         G4cout << " G4PropagatorInField::ComputeStep(): " << G4endl
431                << "  Difficult track - taking     422                << "  Difficult track - taking many sub steps." << G4endl;
432         printStatus( SubStepStartState, SubSte    423         printStatus( SubStepStartState, SubStepStartState, CurrentProposedStepLength, 
433                      NewSafety, 0, pPhysVol );    424                      NewSafety, 0, pPhysVol );        
434       }                                           425       }
435       printStatus( SubStepStartState, CurrentS    426       printStatus( SubStepStartState, CurrentState, CurrentProposedStepLength, 
436                    NewSafety, do_loop_count, p    427                    NewSafety, do_loop_count, pPhysVol );
437     }                                             428     }
438 #endif                                            429 #endif
439                                                   430 
440     ++do_loop_count;                              431     ++do_loop_count;
441                                                   432 
442   } while( (!intersects )                         433   } while( (!intersects )
443         && (!fParticleIsLooping)                  434         && (!fParticleIsLooping)
444         && (StepTaken + kCarTolerance < Curren    435         && (StepTaken + kCarTolerance < CurrentProposedStepLength)  
445         && ( do_loop_count < fMax_loop_count )    436         && ( do_loop_count < fMax_loop_count ) );
446                                                   437 
447   if(  do_loop_count >= fMax_loop_count           438   if(  do_loop_count >= fMax_loop_count
448     && (StepTaken + kCarTolerance < CurrentPro    439     && (StepTaken + kCarTolerance < CurrentProposedStepLength) )
449   {                                               440   {
450     fParticleIsLooping = true;                    441     fParticleIsLooping = true;
451   }                                               442   }
452   if ( ( fParticleIsLooping ) && (fVerboseLeve    443   if ( ( fParticleIsLooping ) && (fVerboseLevel > 0) )
453   {                                               444   {
454     ReportLoopingParticle( do_loop_count, Step    445     ReportLoopingParticle( do_loop_count, StepTaken,
455                            CurrentProposedStep    446                            CurrentProposedStepLength, methodName,
456                            CurrentState.GetMom    447                            CurrentState.GetMomentum(), pPhysVol );
457   }                                               448   }
458                                                   449     
459   if( !intersects )                               450   if( !intersects )
460   {                                               451   {
461     // Chord AB or "minor chords" do not inter    452     // Chord AB or "minor chords" do not intersect
462     // B is the endpoint Step of the current S    453     // B is the endpoint Step of the current Step.
463     //                                            454     //
464     End_PointAndTangent = CurrentState;           455     End_PointAndTangent = CurrentState; 
465     TruePathLength = StepTaken;   //  Original    456     TruePathLength = StepTaken;   //  Original code
466                                                   457  
467     // Tried the following to avoid potential     458     // Tried the following to avoid potential issue with round-off error
468     // - but has issues... Suppressing this ch    459     // - but has issues... Suppressing this change JA 2015/05/02
469     // TruePathLength = CurrentProposedStepLen    460     // TruePathLength = CurrentProposedStepLength;
470   }                                               461   }
471   fLastStepInVolume = intersects;                 462   fLastStepInVolume = intersects;
472                                                   463   
473   // Set pFieldTrack to the return value          464   // Set pFieldTrack to the return value
474   //                                              465   //
475   pFieldTrack = End_PointAndTangent;              466   pFieldTrack = End_PointAndTangent;
476                                                   467 
477 #ifdef G4VERBOSE                                  468 #ifdef G4VERBOSE
478   // Check that "s" is correct                    469   // Check that "s" is correct
479   //                                              470   //
480   if( std::fabs(OriginalState.GetCurveLength()    471   if( std::fabs(OriginalState.GetCurveLength() + TruePathLength 
481       - End_PointAndTangent.GetCurveLength())     472       - End_PointAndTangent.GetCurveLength()) > 3.e-4 * TruePathLength )
482   {                                               473   {
483     std::ostringstream message;                   474     std::ostringstream message;
484     message << "Curve length mis-match between    475     message << "Curve length mis-match between original state "
485             << "and proposed endpoint of propa    476             << "and proposed endpoint of propagation." << G4endl
486             << "  The curve length of the endp    477             << "  The curve length of the endpoint should be: " 
487             << OriginalState.GetCurveLength()     478             << OriginalState.GetCurveLength() + TruePathLength << G4endl
488             << "  and it is instead: "            479             << "  and it is instead: "
489             << End_PointAndTangent.GetCurveLen    480             << End_PointAndTangent.GetCurveLength() << "." << G4endl
490             << "  A difference of: "              481             << "  A difference of: "
491             << OriginalState.GetCurveLength()     482             << OriginalState.GetCurveLength() + TruePathLength 
492                - End_PointAndTangent.GetCurveL    483                - End_PointAndTangent.GetCurveLength() << G4endl
493             << "  Original state = " << Origin    484             << "  Original state = " << OriginalState   << G4endl
494             << "  Proposed state = " << End_Po    485             << "  Proposed state = " << End_PointAndTangent;
495     G4Exception(methodName, "GeomNav0003", Fat    486     G4Exception(methodName, "GeomNav0003", FatalException, message);
496   }                                               487   }
497 #endif                                            488 #endif
498                                                   489 
499   if( TruePathLength+kCarTolerance >= CurrentP    490   if( TruePathLength+kCarTolerance >= CurrentProposedStepLength )
500   {                                               491   {
501      fNoZeroStep = 0;                             492      fNoZeroStep = 0;     
502   }                                               493   }
503   else                                            494   else
504   {                                               495   {     
505      // In particular anomalous cases, we can     496      // In particular anomalous cases, we can get repeated zero steps
506      // We identify these cases and take corre    497      // We identify these cases and take corrective action when they occur.
507      //                                           498      // 
508      if( TruePathLength < std::max( fZeroStepT    499      if( TruePathLength < std::max( fZeroStepThreshold, 0.5*kCarTolerance ) )
509      {                                            500      {
510         ++fNoZeroStep;                            501         ++fNoZeroStep;
511      }                                            502      }
512      else                                         503      else
513      {                                            504      {
514         fNoZeroStep = 0;                          505         fNoZeroStep = 0;
515      }                                            506      }
516   }                                               507   }
517   if( fNoZeroStep > fAbandonThreshold_NoZeroSt    508   if( fNoZeroStep > fAbandonThreshold_NoZeroSteps )
518   {                                               509   { 
519      fParticleIsLooping = true;                   510      fParticleIsLooping = true;
520      ReportStuckParticle( fNoZeroStep, Current    511      ReportStuckParticle( fNoZeroStep, CurrentProposedStepLength,
521                           fFull_CurveLen_of_La    512                           fFull_CurveLen_of_LastAttempt, pPhysVol );
522      fNoZeroStep = 0;                             513      fNoZeroStep = 0; 
523   }                                               514   }
524                                                   515  
525   GetChordFinder()->SetDeltaChord(deltaChord);    516   GetChordFinder()->SetDeltaChord(deltaChord);
526   return TruePathLength;                          517   return TruePathLength;
527 }                                                 518 }
528                                                   519 
529 // -------------------------------------------    520 // ---------------------------------------------------------------------------
530 // Dumps status of propagator                     521 // Dumps status of propagator
531 //                                                522 //
532 void                                              523 void
533 G4PropagatorInField::printStatus( const G4Fiel    524 G4PropagatorInField::printStatus( const G4FieldTrack&      StartFT,
534                                   const G4Fiel    525                                   const G4FieldTrack&      CurrentFT, 
535                                         G4doub    526                                         G4double           requestStep, 
536                                         G4doub    527                                         G4double           safety,
537                                         G4int     528                                         G4int              stepNo, 
538                                         G4VPhy    529                                         G4VPhysicalVolume* startVolume)
539 {                                                 530 {
540   const G4int verboseLevel = fVerboseLevel;       531   const G4int verboseLevel = fVerboseLevel;
541   const G4ThreeVector StartPosition       = St    532   const G4ThreeVector StartPosition       = StartFT.GetPosition();
542   const G4ThreeVector StartUnitVelocity   = St    533   const G4ThreeVector StartUnitVelocity   = StartFT.GetMomentumDir();
543   const G4ThreeVector CurrentPosition     = Cu    534   const G4ThreeVector CurrentPosition     = CurrentFT.GetPosition();
544   const G4ThreeVector CurrentUnitVelocity = Cu    535   const G4ThreeVector CurrentUnitVelocity = CurrentFT.GetMomentumDir();
545                                                   536 
546   G4double step_len = CurrentFT.GetCurveLength    537   G4double step_len = CurrentFT.GetCurveLength() - StartFT.GetCurveLength();
547                                                   538 
548   G4long oldprec;   // cout/cerr precision set << 539   G4int oldprec;   // cout/cerr precision settings
549                                                   540       
550   if( ((stepNo == 0) && (verboseLevel <3)) ||     541   if( ((stepNo == 0) && (verboseLevel <3)) || (verboseLevel >= 3) )
551   {                                               542   {
552     oldprec = G4cout.precision(4);                543     oldprec = G4cout.precision(4);
553     G4cout << std::setw( 5) << "Step#"            544     G4cout << std::setw( 5) << "Step#" 
554            << std::setw(10) << "  s  " << " "     545            << std::setw(10) << "  s  " << " "
555            << std::setw(10) << "X(mm)" << " "     546            << std::setw(10) << "X(mm)" << " "
556            << std::setw(10) << "Y(mm)" << " "     547            << std::setw(10) << "Y(mm)" << " "  
557            << std::setw(10) << "Z(mm)" << " "     548            << std::setw(10) << "Z(mm)" << " "
558            << std::setw( 7) << " N_x " << " "     549            << std::setw( 7) << " N_x " << " "
559            << std::setw( 7) << " N_y " << " "     550            << std::setw( 7) << " N_y " << " "
560            << std::setw( 7) << " N_z " << " "     551            << std::setw( 7) << " N_z " << " " ;
561     G4cout << std::setw( 7) << " Delta|N|" <<     552     G4cout << std::setw( 7) << " Delta|N|" << " "
562            << std::setw( 9) << "StepLen" << "     553            << std::setw( 9) << "StepLen" << " "  
563            << std::setw(12) << "StartSafety" <    554            << std::setw(12) << "StartSafety" << " "  
564            << std::setw( 9) << "PhsStep" << "     555            << std::setw( 9) << "PhsStep" << " ";  
565     if( startVolume != nullptr )                  556     if( startVolume != nullptr )
566       { G4cout << std::setw(18) << "NextVolume    557       { G4cout << std::setw(18) << "NextVolume" << " "; }
567     G4cout.precision(oldprec);                    558     G4cout.precision(oldprec);
568     G4cout << G4endl;                             559     G4cout << G4endl;
569   }                                               560   }
570   if((stepNo == 0) && (verboseLevel <=3))         561   if((stepNo == 0) && (verboseLevel <=3))
571   {                                               562   {
572     // Recurse to print the start values          563     // Recurse to print the start values
573     //                                            564     //
574     printStatus( StartFT, StartFT, -1.0, safet    565     printStatus( StartFT, StartFT, -1.0, safety, -1, startVolume);
575   }                                               566   }
576   if( verboseLevel <= 3 )                         567   if( verboseLevel <= 3 )
577   {                                               568   {
578     if( stepNo >= 0)                              569     if( stepNo >= 0)
579       { G4cout << std::setw( 4) << stepNo << "    570       { G4cout << std::setw( 4) << stepNo << " "; }
580     else                                          571     else
581       { G4cout << std::setw( 5) << "Start" ; }    572       { G4cout << std::setw( 5) << "Start" ; }
582     oldprec = G4cout.precision(8);                573     oldprec = G4cout.precision(8);
583     G4cout << std::setw(10) << CurrentFT.GetCu    574     G4cout << std::setw(10) << CurrentFT.GetCurveLength() << " "; 
584     G4cout.precision(8);                          575     G4cout.precision(8);
585     G4cout << std::setw(10) << CurrentPosition    576     G4cout << std::setw(10) << CurrentPosition.x() << " "
586            << std::setw(10) << CurrentPosition    577            << std::setw(10) << CurrentPosition.y() << " "
587            << std::setw(10) << CurrentPosition    578            << std::setw(10) << CurrentPosition.z() << " ";
588     G4cout.precision(4);                          579     G4cout.precision(4);
589     G4cout << std::setw( 7) << CurrentUnitVelo    580     G4cout << std::setw( 7) << CurrentUnitVelocity.x() << " "
590            << std::setw( 7) << CurrentUnitVelo    581            << std::setw( 7) << CurrentUnitVelocity.y() << " "
591            << std::setw( 7) << CurrentUnitVelo    582            << std::setw( 7) << CurrentUnitVelocity.z() << " ";
592     G4cout.precision(3);                          583     G4cout.precision(3); 
593     G4cout << std::setw( 7)                       584     G4cout << std::setw( 7)
594            << CurrentFT.GetMomentum().mag()-St    585            << CurrentFT.GetMomentum().mag()-StartFT.GetMomentum().mag() << " "; 
595     G4cout << std::setw( 9) << step_len << " "    586     G4cout << std::setw( 9) << step_len << " "; 
596     G4cout << std::setw(12) << safety << " ";     587     G4cout << std::setw(12) << safety << " ";
597     if( requestStep != -1.0 )                     588     if( requestStep != -1.0 ) 
598       { G4cout << std::setw( 9) << requestStep    589       { G4cout << std::setw( 9) << requestStep << " "; }
599     else                                          590     else
600       { G4cout << std::setw( 9) << "Init/NotKn    591       { G4cout << std::setw( 9) << "Init/NotKnown" << " "; }
601     if( startVolume != nullptr)                << 592     if( startVolume != 0)
602       { G4cout << std::setw(12) << startVolume    593       { G4cout << std::setw(12) << startVolume->GetName() << " "; }
603     G4cout.precision(oldprec);                    594     G4cout.precision(oldprec);
604     G4cout << G4endl;                             595     G4cout << G4endl;
605   }                                               596   }
606   else // if( verboseLevel > 3 )                  597   else // if( verboseLevel > 3 )
607   {                                               598   {
608     //  Multi-line output                         599     //  Multi-line output
609                                                   600       
610     G4cout << "Step taken was " << step_len       601     G4cout << "Step taken was " << step_len  
611            << " out of PhysicalStep = " <<  re    602            << " out of PhysicalStep = " <<  requestStep << G4endl;
612     G4cout << "Final safety is: " << safety <<    603     G4cout << "Final safety is: " << safety << G4endl;
613     G4cout << "Chord length = " << (CurrentPos    604     G4cout << "Chord length = " << (CurrentPosition-StartPosition).mag()
614            << G4endl;                             605            << G4endl;
615     G4cout << G4endl;                             606     G4cout << G4endl; 
616   }                                               607   }
617 }                                                 608 }
618                                                   609 
619 // -------------------------------------------    610 // ---------------------------------------------------------------------------
620 // Prints Step diagnostics                        611 // Prints Step diagnostics
621 //                                                612 //
622 void                                              613 void 
623 G4PropagatorInField::PrintStepLengthDiagnostic    614 G4PropagatorInField::PrintStepLengthDiagnostic(
624                           G4double CurrentProp    615                           G4double CurrentProposedStepLength,
625                           G4double decreaseFac    616                           G4double decreaseFactor,
626                           G4double stepTrial,     617                           G4double stepTrial,
627                     const G4FieldTrack& )         618                     const G4FieldTrack& )
628 {                                                 619 {
629   G4long iprec= G4cout.precision(8);           << 620   G4int  iprec= G4cout.precision(8); 
630   G4cout << " " << std::setw(12) << " PiF: NoZ    621   G4cout << " " << std::setw(12) << " PiF: NoZeroStep " 
631          << " " << std::setw(20) << " CurrentP    622          << " " << std::setw(20) << " CurrentProposed len " 
632          << " " << std::setw(18) << " Full_cur    623          << " " << std::setw(18) << " Full_curvelen_last" 
633          << " " << std::setw(18) << " last pro    624          << " " << std::setw(18) << " last proposed len " 
634          << " " << std::setw(18) << " decrease    625          << " " << std::setw(18) << " decrease factor   " 
635          << " " << std::setw(15) << " step tri    626          << " " << std::setw(15) << " step trial  " 
636          << G4endl;                               627          << G4endl;
637                                                   628 
638   G4cout << " " << std::setw(10) << fNoZeroSte    629   G4cout << " " << std::setw(10) << fNoZeroStep << "  "
639          << " " << std::setw(20) << CurrentPro    630          << " " << std::setw(20) << CurrentProposedStepLength
640          << " " << std::setw(18) << fFull_Curv    631          << " " << std::setw(18) << fFull_CurveLen_of_LastAttempt
641          << " " << std::setw(18) << fLast_Prop    632          << " " << std::setw(18) << fLast_ProposedStepLength 
642          << " " << std::setw(18) << decreaseFa    633          << " " << std::setw(18) << decreaseFactor
643          << " " << std::setw(15) << stepTrial     634          << " " << std::setw(15) << stepTrial
644          << G4endl;                               635          << G4endl;
645   G4cout.precision( iprec );                      636   G4cout.precision( iprec );
646 }                                                 637 }
647                                                   638 
648 // Access the points which have passed through    639 // Access the points which have passed through the filter. The
649 // points are stored as ThreeVectors for the i    640 // points are stored as ThreeVectors for the initial impelmentation
650 // only (jacek 30/10/2002)                        641 // only (jacek 30/10/2002)
651 // Responsibility for deleting the points lies    642 // Responsibility for deleting the points lies with
652 // SmoothTrajectoryPoint, which is the points'    643 // SmoothTrajectoryPoint, which is the points' final
653 // destination. The points pointer is set to N    644 // destination. The points pointer is set to NULL, to ensure that
654 // the points are not re-used in subsequent st    645 // the points are not re-used in subsequent steps, therefore THIS
655 // METHOD MUST BE CALLED EXACTLY ONCE PER STEP    646 // METHOD MUST BE CALLED EXACTLY ONCE PER STEP. (jacek 08/11/2002)
656                                                   647 
657 std::vector<G4ThreeVector>*                       648 std::vector<G4ThreeVector>*
658 G4PropagatorInField::GimmeTrajectoryVectorAndF    649 G4PropagatorInField::GimmeTrajectoryVectorAndForgetIt() const
659 {                                                 650 {
660   // NB, GimmeThePointsAndForgetThem really fo    651   // NB, GimmeThePointsAndForgetThem really forgets them, so it can
661   // only be called (exactly) once for each st    652   // only be called (exactly) once for each step.
662                                                   653 
663   if (fpTrajectoryFilter != nullptr)              654   if (fpTrajectoryFilter != nullptr)
664   {                                               655   {
665     return fpTrajectoryFilter->GimmeThePointsA    656     return fpTrajectoryFilter->GimmeThePointsAndForgetThem();
666   }                                               657   }
667   return nullptr;                              << 658   else
                                                   >> 659   {
                                                   >> 660     return nullptr;
                                                   >> 661   }
668 }                                                 662 }
669                                                   663 
670 // -------------------------------------------    664 // ---------------------------------------------------------------------------
671 //                                                665 //
672 void                                              666 void 
673 G4PropagatorInField::SetTrajectoryFilter(G4VCu    667 G4PropagatorInField::SetTrajectoryFilter(G4VCurvedTrajectoryFilter* filter)
674 {                                                 668 {
675   fpTrajectoryFilter = filter;                    669   fpTrajectoryFilter = filter;
676 }                                                 670 }
677                                                   671 
678 // -------------------------------------------    672 // ---------------------------------------------------------------------------
679 //                                                673 //
680 void G4PropagatorInField::ClearPropagatorState    674 void G4PropagatorInField::ClearPropagatorState()
681 {                                                 675 {
682   // Goal: Clear all memory of previous steps,    676   // Goal: Clear all memory of previous steps,  cached information
683                                                   677 
684   fParticleIsLooping = false;                     678   fParticleIsLooping = false;
685   fNoZeroStep = 0;                                679   fNoZeroStep = 0;
686                                                   680 
687   fSetFieldMgr = false;  // Has field-manager  << 
688   fEpsilonStep= 1.0e-5;  // Relative accuracy  << 
689                                                << 
690   End_PointAndTangent= G4FieldTrack( G4ThreeVe    681   End_PointAndTangent= G4FieldTrack( G4ThreeVector(0.,0.,0.),
691                                      G4ThreeVe    682                                      G4ThreeVector(0.,0.,0.),
692                                      0.0,0.0,0    683                                      0.0,0.0,0.0,0.0,0.0); 
693   fFull_CurveLen_of_LastAttempt = -1;             684   fFull_CurveLen_of_LastAttempt = -1; 
694   fLast_ProposedStepLength = -1;                  685   fLast_ProposedStepLength = -1;
695                                                   686 
696   fPreviousSftOrigin= G4ThreeVector(0.,0.,0.);    687   fPreviousSftOrigin= G4ThreeVector(0.,0.,0.);
697   fPreviousSafety= 0.0;                           688   fPreviousSafety= 0.0;
698                                                << 
699   fNewTrack = true;                            << 
700 }                                                 689 }
701                                                   690 
702 // -------------------------------------------    691 // ---------------------------------------------------------------------------
703 //                                                692 //
704 G4FieldManager* G4PropagatorInField::             693 G4FieldManager* G4PropagatorInField::
705 FindAndSetFieldManager( G4VPhysicalVolume* pCu    694 FindAndSetFieldManager( G4VPhysicalVolume* pCurrentPhysicalVolume )
706 {                                                 695 {
707   G4FieldManager* currentFieldMgr;                696   G4FieldManager* currentFieldMgr;
708                                                   697 
709   currentFieldMgr = fDetectorFieldMgr;            698   currentFieldMgr = fDetectorFieldMgr;
710   if( pCurrentPhysicalVolume != nullptr )         699   if( pCurrentPhysicalVolume != nullptr )
711   {                                               700   {
712      G4FieldManager *pRegionFieldMgr = nullptr    701      G4FieldManager *pRegionFieldMgr = nullptr, *localFieldMgr = nullptr;
713      G4LogicalVolume* pLogicalVol = pCurrentPh    702      G4LogicalVolume* pLogicalVol = pCurrentPhysicalVolume->GetLogicalVolume();
714                                                   703 
715      if( pLogicalVol != nullptr )                 704      if( pLogicalVol != nullptr )
716      {                                            705      { 
717         // Value for Region, if any, overrides    706         // Value for Region, if any, overrides
718         //                                        707         //
719         G4Region*  pRegion = pLogicalVol->GetR    708         G4Region*  pRegion = pLogicalVol->GetRegion();
720         if( pRegion != nullptr )                  709         if( pRegion != nullptr )
721         {                                         710         { 
722            pRegionFieldMgr = pRegion->GetField    711            pRegionFieldMgr = pRegion->GetFieldManager();
723            if( pRegionFieldMgr != nullptr )       712            if( pRegionFieldMgr != nullptr )
724            {                                      713            {
725               currentFieldMgr= pRegionFieldMgr    714               currentFieldMgr= pRegionFieldMgr;
726            }                                      715            }
727         }                                         716         }
728                                                   717 
729         // 'Local' Value from logical volume,     718         // 'Local' Value from logical volume, if any, overrides
730         //                                        719         //
731         localFieldMgr = pLogicalVol->GetFieldM    720         localFieldMgr = pLogicalVol->GetFieldManager();
732         if ( localFieldMgr != nullptr )           721         if ( localFieldMgr != nullptr )
733         {                                         722         {
734            currentFieldMgr = localFieldMgr;       723            currentFieldMgr = localFieldMgr;
735         }                                         724         }
736      }                                            725      }
737   }                                               726   }
738   fCurrentFieldMgr = currentFieldMgr;             727   fCurrentFieldMgr = currentFieldMgr;
739                                                   728 
740   // Flag that field manager has been set         729   // Flag that field manager has been set
741   //                                              730   //
742   fSetFieldMgr = true;                            731   fSetFieldMgr = true;
743                                                   732 
744   return currentFieldMgr;                         733   return currentFieldMgr;
745 }                                                 734 }
746                                                   735 
747 // -------------------------------------------    736 // ---------------------------------------------------------------------------
748 //                                                737 //
749 G4int G4PropagatorInField::SetVerboseLevel( G4    738 G4int G4PropagatorInField::SetVerboseLevel( G4int level )
750 {                                                 739 {
751   G4int oldval = fVerboseLevel;                   740   G4int oldval = fVerboseLevel;
752   fVerboseLevel = level;                          741   fVerboseLevel = level;
753                                                   742 
754   // Forward the verbose level 'reduced' to Ch    743   // Forward the verbose level 'reduced' to ChordFinder,
755   // MagIntegratorDriver ... ?                    744   // MagIntegratorDriver ... ? 
756   //                                              745   //
757   auto integrDriver = GetChordFinder()->GetInt    746   auto integrDriver = GetChordFinder()->GetIntegrationDriver(); 
758   integrDriver->SetVerboseLevel( fVerboseLevel    747   integrDriver->SetVerboseLevel( fVerboseLevel - 2 );
759   G4cout << "Set Driver verbosity to " << fVer    748   G4cout << "Set Driver verbosity to " << fVerboseLevel - 2 << G4endl;
760                                                   749 
761   return oldval;                                  750   return oldval;
762 }                                                 751 }
763                                                   752 
764 // -------------------------------------------    753 // ---------------------------------------------------------------------------
765 //                                                754 //
766 void G4PropagatorInField::ReportLoopingParticl    755 void G4PropagatorInField::ReportLoopingParticle( G4int count,
767                                                   756                                                  G4double StepTaken,
768                                                   757                                                  G4double StepRequested,
769                                                   758                                                  const char* methodName,
770                                                << 759                                                  G4ThreeVector momentumVec,
771                                                   760                                                  G4VPhysicalVolume* pPhysVol )
772 {                                                 761 {
773    std::ostringstream message;                    762    std::ostringstream message;
774    G4double fraction = StepTaken / StepRequest    763    G4double fraction = StepTaken / StepRequested;
775    message << " Unfinished integration of trac    764    message << " Unfinished integration of track (likely looping particle)  "
776            << " of momentum " << momentumVec <    765            << " of momentum " << momentumVec << " ( magnitude = "
777            << momentumVec.mag() << " ) " << G4    766            << momentumVec.mag() << " ) " << G4endl
778            << " after " << count << " field su    767            << " after " << count << " field substeps "
779            << " totaling " << std::setprecisio    768            << " totaling " << std::setprecision(12) << StepTaken / mm << " mm "
780            << " out of requested step " << std    769            << " out of requested step " << std::setprecision(12)
781            << StepRequested / mm << " mm ";       770            << StepRequested / mm << " mm ";
782    message << " a fraction of ";                  771    message << " a fraction of ";
783    G4int prec = 4;                                772    G4int prec = 4;
784    if( fraction > 0.99 )                          773    if( fraction > 0.99 )
785    {                                              774    {
786      prec = 7;                                    775      prec = 7;
787    }                                              776    }
788    else                                           777    else
789    {                                              778    {
790      if (fraction > 0.97 )  { prec = 5; }         779      if (fraction > 0.97 )  { prec = 5; }
791    }                                              780    }
792    message << std::setprecision(prec)             781    message << std::setprecision(prec) 
793            << 100. * StepTaken / StepRequested    782            << 100. * StepTaken / StepRequested << " % " << G4endl ;
794    if( pPhysVol != nullptr )                   << 783    if( pPhysVol )
795    {                                              784    {
796      message << " in volume " << pPhysVol->Get << 785       message << " in volume " << pPhysVol->GetName() ;
797      auto material = pPhysVol->GetLogicalVolum << 786       auto material = pPhysVol->GetLogicalVolume()->GetMaterial();
798      if( material != nullptr )                 << 787       if( material != nullptr )
799      {                                         << 788          message << " with material " << material->GetName()
800        message << " with material " << materia << 789                  << " ( density = "
801                << " ( density = "              << 790                  << material->GetDensity() / ( g/(cm*cm*cm) ) << " g / cm^3 ) ";
802                << material->GetDensity() / ( g << 
803      }                                         << 
804    }                                              791    }
805    else                                           792    else
806    {                                              793    {
807      message << " in unknown (null) volume. "  << 794       message << " in unknown (null) volume. " ;
808    }                                              795    }
809    G4Exception(methodName, "GeomNav1002", Just    796    G4Exception(methodName, "GeomNav1002", JustWarning, message);   
810 }                                                 797 }
811                                                   798 
812 // -------------------------------------------    799 // ---------------------------------------------------------------------------
813 //                                                800 //
814 void G4PropagatorInField::ReportStuckParticle(    801 void G4PropagatorInField::ReportStuckParticle( G4int    noZeroSteps,
815                                                   802                                                G4double proposedStep,
816                                                   803                                                G4double lastTriedStep,
817                                                   804                                                G4VPhysicalVolume* physVol )
818 {                                                 805 {
819    std::ostringstream message;                    806    std::ostringstream message;
820    message << "Particle is stuck; it will be k    807    message << "Particle is stuck; it will be killed." << G4endl
821            << "  Zero progress for " << noZero    808            << "  Zero progress for " << noZeroSteps << " attempted steps." 
822            << G4endl                              809            << G4endl
823            << "  Proposed Step is " << propose    810            << "  Proposed Step is " << proposedStep
824            << " but Step Taken is "<< lastTrie    811            << " but Step Taken is "<< lastTriedStep << G4endl;
825    if( physVol != nullptr )                       812    if( physVol != nullptr )
826    {                                           << 
827       message << " in volume " << physVol->Get    813       message << " in volume " << physVol->GetName() ; 
828    }                                           << 
829    else                                           814    else
830    {                                           << 
831       message << " in unknown or null volume.     815       message << " in unknown or null volume. " ; 
832    }                                           << 
833    G4Exception("G4PropagatorInField::ComputeSt    816    G4Exception("G4PropagatorInField::ComputeStep()",
834                "GeomNav1002", JustWarning, mes    817                "GeomNav1002", JustWarning, message);
835 }                                              << 
836                                                << 
837 // ------------------------------------------- << 
838                                                << 
839 // ------------------------------------------- << 
840 // Methods to alter Parameters                 << 
841 // ------------------------------------------- << 
842                                                << 
843 // Was a data member (of an object) -- now mov << 
844 G4double  G4PropagatorInField::GetLargestAccep << 
845 {                                              << 
846   return fLargestAcceptableStep;               << 
847 }                                              << 
848                                                << 
849 // ------------------------------------------- << 
850 //                                             << 
851 void G4PropagatorInField::SetLargestAcceptable << 
852 {                                              << 
853   if( fLargestAcceptableStep>0.0 )             << 
854   {                                            << 
855     fLargestAcceptableStep = newBigDist;       << 
856   }                                            << 
857 }                                              << 
858                                                << 
859 // ------------------------------------------- << 
860                                                << 
861 G4double G4PropagatorInField::GetMaxStepSizeMu << 
862 {                                              << 
863   return fMaxStepSizeMultiplier;               << 
864 }                                              << 
865                                                << 
866 // ------------------------------------------- << 
867                                                << 
868 void     G4PropagatorInField::SetMaxStepSizeMu << 
869 {                                              << 
870   fMaxStepSizeMultiplier=vm;                   << 
871 }                                              << 
872                                                << 
873 // ------------------------------------------- << 
874                                                << 
875 G4double G4PropagatorInField::GetMinBigDistanc << 
876 {                                              << 
877   return fMinBigDistance;                      << 
878 }                                              << 
879                                                << 
880 // ------------------------------------------- << 
881                                                << 
882 void     G4PropagatorInField::SetMinBigDistanc << 
883 {                                              << 
884   fMinBigDistance= val;                        << 
885 }                                                 818 }
886                                                   819