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25 //
26 // G4BOptnForceFreeFlight
27 // --------------------------------------------------------------------
28 #include "G4BOptnForceFreeFlight.hh"
29 #include "G4ILawForceFreeFlight.hh"
30 #include "G4BiasingProcessInterface.hh"
31 #include "G4Step.hh"
32
33 G4BOptnForceFreeFlight::G4BOptnForceFreeFlight(const G4String& name)
34 : G4VBiasingOperation( name )
35 {
36 fForceFreeFlightInteractionLaw = new G4ILawForceFreeFlight("LawForOperation"+name);
37 }
38
39 G4BOptnForceFreeFlight::~G4BOptnForceFreeFlight()
40 {
41 delete fForceFreeFlightInteractionLaw;
42 }
43
44 const G4VBiasingInteractionLaw* G4BOptnForceFreeFlight::
45 ProvideOccurenceBiasingInteractionLaw( const G4BiasingProcessInterface*,
46 G4ForceCondition& proposeForceCondition )
47 {
48 fOperationComplete = false;
49 proposeForceCondition = Forced;
50 return fForceFreeFlightInteractionLaw;
51 }
52
53 G4VParticleChange* G4BOptnForceFreeFlight::
54 ApplyFinalStateBiasing( const G4BiasingProcessInterface* callingProcess,
55 const G4Track* track, const G4Step* step,
56 G4bool& forceFinalState)
57 {
58 // -- If the track is reaching the volume boundary, its free flight ends. In this case, its zero
59 // -- weight is brought back to non-zero value: its initial weight is restored by the first
60 // -- ApplyFinalStateBiasing operation called, and the weight for force free flight is applied
61 // -- is applied by each operation.
62 // -- If the track is not reaching the volume boundary, it zero weight flight continues.
63
64 fParticleChange.Initialize( *track );
65 forceFinalState = true;
66 if ( step->GetPostStepPoint()->GetStepStatus() == fGeomBoundary )
67 {
68 // -- Sanity checks:
69 if ( fInitialTrackWeight <= DBL_MIN )
70 {
71 G4ExceptionDescription ed;
72 ed << " Initial track weight is null ! " << G4endl;
73 G4Exception(" G4BOptnForceFreeFlight::ApplyFinalStateBiasing(...)",
74 "BIAS.GEN.05", JustWarning, ed);
75 }
76 if ( fCumulatedWeightChange <= DBL_MIN )
77 {
78 G4ExceptionDescription ed;
79 ed << " Cumulated weight is null ! " << G4endl;
80 G4Exception(" G4BOptnForceFreeFlight::ApplyFinalStateBiasing(...)",
81 "BIAS.GEN.06", JustWarning, ed);
82 }
83 G4double proposedWeight = track->GetWeight();
84 if ( callingProcess->GetIsFirstPostStepDoItInterface() )
85 proposedWeight = fCumulatedWeightChange * fInitialTrackWeight;
86 else
87 proposedWeight *= fCumulatedWeightChange;
88 fParticleChange.ProposeWeight(proposedWeight);
89 fOperationComplete = true;
90 }
91
92 return &fParticleChange;
93 }
94
95 void G4BOptnForceFreeFlight::
96 AlongMoveBy( const G4BiasingProcessInterface*,
97 const G4Step*, G4double weightChange )
98 {
99 fCumulatedWeightChange *= weightChange;
100 }
101