void FastSimModelTracker::DoIt(const G4FastTrack& aFastTrack,
G4FastStep& aFastStep) {
// Calculate the position of the particle at the end of volume
const G4Track* track = aFastTrack.GetPrimaryTrack();
G4ThreeVector spin = track->GetPolarization() ;
G4FieldTrack aFieldTrack('t');
G4FieldTrackUpdator::Update(&aFieldTrack,track);
G4double retSafety= -1.0;
ELimited retStepLimited;
G4FieldTrack endTrack('a');
G4double currentMinimumStep= 10*m; // TODO change that to sth connected to particle momentum and geometry
G4PathFinder* fPathFinder = G4PathFinder::GetInstance();
fPathFinder->ComputeStep( aFieldTrack,
currentMinimumStep,
0,
track->GetCurrentStepNumber(),
retSafety,
retStepLimited,
endTrack,
track->GetVolume() );
aFastStep.ProposePrimaryTrackFinalPosition( endTrack.GetPosition() );
// Smear particle's momentum according to the tracker resolution
G4ThreeVector Psm = track->GetMomentum();
m_smearTool->smearMomentum(Psm);
G4ThreeVector DeltaP = track->GetMomentum() - Psm;
G4double Ekinorg = track->GetKineticEnergy();
aFastStep.ClearDebugFlag(); // to disable Geant checks on energy
aFastStep.ProposePrimaryTrackFinalKineticEnergyAndDirection(Ekinorg+DeltaP.mag(), Psm.unit());
// Keep track of smeared momentum
if(track->GetParentID()==0) {
ParticleInformation* info = dynamic_cast<ParticleInformation*>(track->GetDynamicParticle()->GetPrimaryParticle()->GetUserInformation());
info->setSmeared(true);
info->setEndStatus(1); // how it is defined ???? as in HepMC ?
info->setEndMomentum(Psm);
info->setVertexPosition( track->GetVertexPosition());
}
}
void FastSimModelTracker::DoIt(const G4FastTrack& aFastTrack,
G4FastStep& aFastStep) {
// Calculate the position of the particle at the end of volume
const G4Track* track = aFastTrack.GetPrimaryTrack();
G4ThreeVector spin = track->GetPolarization() ;
G4FieldTrack theFieldTrack = G4FieldTrack( track->GetPosition(),
track->GetMomentumDirection(),
0.0,
track->GetKineticEnergy(),
track->GetDynamicParticle()->GetDefinition()->GetPDGMass(),
0.0,
track->GetGlobalTime(), // Lab.
track->GetProperTime(), // Part.
&spin) ;
G4double retSafety= -1.0;
ELimited retStepLimited;
G4FieldTrack endTrack('a');
G4double currentMinimumStep= 10*m; // TODO change that to sth connected to particle momentum and geometry
G4PathFinder* fPathFinder = G4PathFinder::GetInstance();
fPathFinder->ComputeStep( theFieldTrack,
currentMinimumStep,
0,
track->GetCurrentStepNumber(),
retSafety,
retStepLimited,
endTrack,
track->GetVolume() );
aFastStep.ProposePrimaryTrackFinalPosition( endTrack.GetPosition() );
// Smear particle's momentum according to the tracker resolution (set in SimpleSmear)
G4ThreeVector Psm = track->GetMomentum();
m_smearTool->smearMomentum(Psm);
G4ThreeVector DeltaP = track->GetMomentum() - Psm;
G4double Ekinorg = track->GetKineticEnergy();
aFastStep.ClearDebugFlag(); // to disable Geant checks on energy
aFastStep.ProposePrimaryTrackFinalKineticEnergyAndDirection(Ekinorg+DeltaP.mag(), Psm.unit());
}
