splitting/src/SplitProcess.cc

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0029 // Med. Phys. 37 (2010) 4692-4708
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0031 //
0032 /// \file SplitProcess.cc
0033 /// \brief Implementation of the variance reduction particle split class
0034
0035 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0036
0037 #include "SplitProcess.hh"
0038
0039 #include "UserTrackInformation.hh"
0040
0041 #include "G4LogicalVolume.hh"
0042 #include "G4Region.hh"
0043 #include "G4RegionStore.hh"
0044 #include "G4TouchableHandle.hh"
0045 #include "G4Track.hh"
0046 #include "G4VParticleChange.hh"
0047
0048 #include <vector>
0049
0050 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0051
0052 SplitProcess::SplitProcess(G4String regName, G4int nsplit) : fRegionName(regName), fNSplit(nsplit)
0053 {
0054   fRegion = G4RegionStore::GetInstance()->FindOrCreateRegion(fRegionName);
0055 }
0056
0057 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0058
0059 SplitProcess::~SplitProcess() {}
0060
0061 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0062
0063 G4VParticleChange* SplitProcess::PostStepDoIt(const G4Track& track, const G4Step& step)
0064 {
0065   G4VParticleChange* particleChange(0);
0066
0067   if (step.GetPreStepPoint()->GetTouchableHandle()->GetVolume()->GetLogicalVolume()->GetRegion()
0068       != fRegion)
0069   {
0070     particleChange = pRegProcess->PostStepDoIt(track, step);
0071     assert(0 != particleChange);
0072     return particleChange;
0073   }
0074
0075   if (fNSplit == 1) {
0076     particleChange = pRegProcess->PostStepDoIt(track, step);
0077     assert(0 != particleChange);
0078     return particleChange;
0079   }
0080
0081   UserTrackInformation* parentInformation =
0082     (UserTrackInformation*)(step.GetTrack()->GetUserInformation());
0083   G4int initialSplitTrackID = parentInformation->GetSplitTrackID();
0084
0085   if (initialSplitTrackID > 1) {
0086     particleChange = pRegProcess->PostStepDoIt(track, step);
0087     assert(0 != particleChange);
0088     return particleChange;
0089   }
0090
0091   G4double weight = track.GetWeight() / fNSplit;
0092   G4int splitTrackID = 3;
0093
0094   std::vector<G4Track*> secondaries;
0095   std::vector<G4int> vSplitTrack;
0096
0097   for (int i = 0; i < fNSplit; i++) {
0098     particleChange = pRegProcess->PostStepDoIt(track, step);
0099     assert(0 != particleChange);
0100     particleChange->SetVerboseLevel(0);
0101     G4Track* newTrack = new G4Track(*(particleChange->GetSecondary(0)));
0102
0103     secondaries.push_back(newTrack);
0104     vSplitTrack.push_back(splitTrackID);
0105
0106     splitTrackID++;
0107   }
0108
0109   parentInformation->SetSplitTrackID(2);
0110
0111   particleChange->SetNumberOfSecondaries(secondaries.size());
0112   particleChange->SetSecondaryWeightByProcess(true);
0113
0114   std::vector<G4Track*>::iterator iter = secondaries.begin();
0115   G4int i = 0;
0116   while (iter != secondaries.end()) {
0117     G4Track* newTrack = *iter;
0118     newTrack->SetWeight(weight);
0119
0120     UserTrackInformation* secondaryInformation = new UserTrackInformation();
0121     secondaryInformation->SetSplitTrackID(vSplitTrack[i]);
0122     newTrack->SetUserInformation(secondaryInformation);
0123
0124     particleChange->AddSecondary(newTrack);
0125
0126     iter++;
0127     i++;
0128   }
0129
0130   return particleChange;
0131 }
0132
0133 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......