G4WeightWindowProcess.cc

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//
//
// $Id$
//
// ----------------------------------------------------------------------
// GEANT 4 class source file
//
// G4WeightWindowProcess.cc
//
// ----------------------------------------------------------------------

#include "G4WeightWindowProcess.hh"
#include "G4VWeightWindowAlgorithm.hh"
#include "G4GeometryCell.hh"
#include "G4SamplingPostStepAction.hh"
#include "G4VTrackTerminator.hh"
#include "G4PlaceOfAction.hh"
#include "G4VWeightWindowStore.hh"

#include "G4Step.hh"
#include "G4Navigator.hh"
#include "G4VTouchable.hh"
#include "G4VPhysicalVolume.hh"
#include "G4ParticleChange.hh"
#include "G4PathFinder.hh"
#include "G4TransportationManager.hh"
#include "G4StepPoint.hh"
#include "G4FieldTrackUpdator.hh"


G4WeightWindowProcess::G4WeightWindowProcess(
                    const G4VWeightWindowAlgorithm &aWeightWindowAlgorithm,
                    const G4VWeightWindowStore &aWWStore,
                    const G4VTrackTerminator *TrackTerminator,
                          G4PlaceOfAction placeOfAction,
                    const G4String &aName, G4bool para)
 : G4VProcess(aName),
   fParticleChange(new G4ParticleChange),
   fWeightWindowAlgorithm(aWeightWindowAlgorithm),
   fWeightWindowStore(aWWStore),
   fPostStepAction(0),
   fPlaceOfAction(placeOfAction),
   fGhostNavigator(0), fNavigatorID(-1), fFieldTrack('0')
{
  if (TrackTerminator)
  {
    fPostStepAction = new G4SamplingPostStepAction(*TrackTerminator);
  }
  else
  {
    fPostStepAction = new G4SamplingPostStepAction(*this);
  }
  if (!fParticleChange)
  {
    G4Exception("G4WeightWindowProcess::G4WeightWindowProcess()",
                "FatalError", FatalException,
                "Failed allocation of G4ParticleChange !");
  }
  G4VProcess::pParticleChange = fParticleChange;

  fGhostStep = new G4Step();
  fGhostPreStepPoint = fGhostStep->GetPreStepPoint();
  fGhostPostStepPoint = fGhostStep->GetPostStepPoint();

  fTransportationManager = G4TransportationManager::GetTransportationManager();
  fPathFinder = G4PathFinder::GetInstance();

  if (verboseLevel>0)
  {
    G4cout << GetProcessName() << " is created " << G4endl;
  }

  paraflag = para;

}

G4WeightWindowProcess::~G4WeightWindowProcess()
{

  delete fPostStepAction;
  delete fParticleChange;
  delete fGhostStep;

}


//------------------------------------------------------
//
// SetParallelWorld 
//
//------------------------------------------------------
void G4WeightWindowProcess::
SetParallelWorld(G4String parallelWorldName)
{
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
// Get pointers of the parallel world and its navigator
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  fGhostWorldName = parallelWorldName;
  fGhostWorld = fTransportationManager->GetParallelWorld(fGhostWorldName);
  fGhostNavigator = fTransportationManager->GetNavigator(fGhostWorld);
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
}

void G4WeightWindowProcess::
SetParallelWorld(G4VPhysicalVolume* parallelWorld)
{
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
// Get pointer of navigator
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  fGhostWorldName = parallelWorld->GetName();
  fGhostWorld = parallelWorld;
  fGhostNavigator = fTransportationManager->GetNavigator(fGhostWorld);
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
}

//------------------------------------------------------
//
// StartTracking
//
//------------------------------------------------------
void G4WeightWindowProcess::StartTracking(G4Track* trk)
{
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
// Activate navigator and get the navigator ID
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
// G4cout << " G4ParallelWorldScoringProcess::StartTracking" << G4endl;

  if(paraflag) {
    if(fGhostNavigator)
      { fNavigatorID = fTransportationManager->ActivateNavigator(fGhostNavigator); }
    else
      {
        G4Exception("G4WeightWindowProcess::StartTracking",
                    "ProcParaWorld000",FatalException,
                    "G4WeightWindowProcess is used for tracking without having a parallel world assigned");
      }
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

// G4cout << "G4ParallelWorldScoringProcess::StartTracking <<<<<<<<<<<<<<<<<< " << G4endl;
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
// Let PathFinder initialize
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
    fPathFinder->PrepareNewTrack(trk->GetPosition(),trk->GetMomentumDirection());
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
// Setup initial touchables for the first step
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
    fOldGhostTouchable = fPathFinder->CreateTouchableHandle(fNavigatorID);
    fGhostPreStepPoint->SetTouchableHandle(fOldGhostTouchable);
    fNewGhostTouchable = fOldGhostTouchable;
    fGhostPostStepPoint->SetTouchableHandle(fNewGhostTouchable);

  // Initialize 
    fGhostSafety = -1.;
    fOnBoundary = false;
  }
}


G4double G4WeightWindowProcess::
PostStepGetPhysicalInteractionLength(const G4Track& ,
                                     G4double   ,
                                     G4ForceCondition* condition)
{
//   *condition = Forced;
//   return kInfinity;

//  *condition = StronglyForced;
  *condition = Forced;
  return DBL_MAX;
}
  
G4VParticleChange *
G4WeightWindowProcess::PostStepDoIt(const G4Track &aTrack,
                                        const G4Step &aStep)
{

  fParticleChange->Initialize(aTrack);

  if(paraflag) {
    fOldGhostTouchable = fGhostPostStepPoint->GetTouchableHandle();
    //xbug?    fOnBoundary = false;
    CopyStep(aStep);

    if(fOnBoundary)
      {
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
// Locate the point and get new touchable
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  //??  fPathFinder->Locate(step.GetPostStepPoint()->GetPosition(),
  //??                      step.GetPostStepPoint()->GetMomentumDirection());
        fNewGhostTouchable = fPathFinder->CreateTouchableHandle(fNavigatorID);
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
      }
    else
      {
        // Do I need this ??????????????????????????????????????????????????????????
        // fGhostNavigator->LocateGlobalPointWithinVolume(track.GetPosition());
        // ?????????????????????????????????????????????????????????????????????????
        
        // fPathFinder->ReLocate(track.GetPosition());
        
        // reuse the touchable
        fNewGhostTouchable = fOldGhostTouchable;
      }

    fGhostPreStepPoint->SetTouchableHandle(fOldGhostTouchable);
    fGhostPostStepPoint->SetTouchableHandle(fNewGhostTouchable);

  }

  if (aStep.GetStepLength() > kCarTolerance)
  {
//     if ( ( fPlaceOfAction == onBoundaryAndCollision)
//       || ( (fPlaceOfAction == onBoundary) && 
//            (aStep.GetPostStepPoint()->GetStepStatus() == fGeomBoundary) )
//       || ( (fPlaceOfAction == onCollision) && 
//            (aStep.GetPostStepPoint()->GetStepStatus() != fGeomBoundary) ) )
    if(paraflag) {
      if ( ( fPlaceOfAction == onBoundaryAndCollision)
           || ( (fPlaceOfAction == onBoundary) && 
                (fGhostPostStepPoint->GetStepStatus() == fGeomBoundary) )
           || ( (fPlaceOfAction == onCollision) && 
                (fGhostPostStepPoint->GetStepStatus() != fGeomBoundary) ) )
        {

//       G4StepPoint *postpoint = aStep.GetPostStepPoint();

//       G4GeometryCell postCell(*(postpoint->GetPhysicalVolume()), 
//                              postpoint->GetTouchable()->GetReplicaNumber());

          G4GeometryCell postCell(*(fGhostPostStepPoint->GetPhysicalVolume()), 
                                  fGhostPostStepPoint->GetTouchable()->GetReplicaNumber());
          G4Nsplit_Weight nw =
            fWeightWindowAlgorithm.Calculate(aTrack.GetWeight(),
                                             fWeightWindowStore.GetLowerWeight(postCell,
                                                    aTrack.GetKineticEnergy()));
          fPostStepAction->DoIt(aTrack, fParticleChange, nw);
        }
    } else {
      if ( ( fPlaceOfAction == onBoundaryAndCollision)
           || ( (fPlaceOfAction == onBoundary) && 
                (aStep.GetPostStepPoint()->GetStepStatus() == fGeomBoundary) )
           || ( (fPlaceOfAction == onCollision) && 
                (aStep.GetPostStepPoint()->GetStepStatus() != fGeomBoundary) ) )
        {
          
          G4StepPoint *postpoint = aStep.GetPostStepPoint();
          
          G4GeometryCell postCell(*(postpoint->GetPhysicalVolume()), 
                                  postpoint->GetTouchable()->GetReplicaNumber());
          
          G4Nsplit_Weight nw =
            fWeightWindowAlgorithm.Calculate(aTrack.GetWeight(),
                                             fWeightWindowStore.GetLowerWeight(postCell,
                                                                               aTrack.GetKineticEnergy()));
          fPostStepAction->DoIt(aTrack, fParticleChange, nw);
        }
    }
  }
  return fParticleChange;
}

void G4WeightWindowProcess::KillTrack() const
{
  fParticleChange->ProposeTrackStatus(fStopAndKill);
}

const G4String &G4WeightWindowProcess::GetName() const
{
  return G4VProcess::GetProcessName();
}

G4double G4WeightWindowProcess::
AlongStepGetPhysicalInteractionLength(
            const G4Track& track, G4double  previousStepSize, G4double  currentMinimumStep,
            G4double& proposedSafety, G4GPILSelection* selection)
{
  if(paraflag) {
    static G4FieldTrack endTrack('0');
    static ELimited eLimited;
    
    *selection = NotCandidateForSelection;
    G4double returnedStep = DBL_MAX;
    
    if (previousStepSize > 0.)
      { fGhostSafety -= previousStepSize; }
    //  else
    //  { fGhostSafety = -1.; }
    if (fGhostSafety < 0.) fGhostSafety = 0.0;
    
    // ------------------------------------------
    // Determination of the proposed STEP LENGTH:
    // ------------------------------------------
    if (currentMinimumStep <= fGhostSafety && currentMinimumStep > 0.)
      {
        // I have no chance to limit
        returnedStep = currentMinimumStep;
        fOnBoundary = false;
        proposedSafety = fGhostSafety - currentMinimumStep;
      }
    else // (currentMinimumStep > fGhostSafety: I may limit the Step)
      {
        G4FieldTrackUpdator::Update(&fFieldTrack,&track);
        //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
        // ComputeStep
        //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
        returnedStep
          = fPathFinder->ComputeStep(fFieldTrack,currentMinimumStep,fNavigatorID,
                                     track.GetCurrentStepNumber(),fGhostSafety,eLimited,
                                     endTrack,track.GetVolume());
        //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
        if(eLimited == kDoNot)
          {
            // Track is not on the boundary
            fOnBoundary = false;
            fGhostSafety = fGhostNavigator->ComputeSafety(endTrack.GetPosition());
          }
        else
          {
            // Track is on the boundary
            fOnBoundary = true;
            proposedSafety = fGhostSafety;
          }
        //xbug? proposedSafety = fGhostSafety;
        if(eLimited == kUnique || eLimited == kSharedOther) {
          *selection = CandidateForSelection;
        }else if (eLimited == kSharedTransport) { 
          returnedStep *= (1.0 + 1.0e-9);  
          // Expand to disable its selection in Step Manager comparison
        }
        
      }

  // ----------------------------------------------
  // Returns the fGhostSafety as the proposedSafety
  // The SteppingManager will take care of keeping
  // the smallest one.
  // ----------------------------------------------
    return returnedStep;

  } else {
    return DBL_MAX;
    // not sensible - time goes backwards!    return -1.0;
  }

}

G4double G4WeightWindowProcess::
AtRestGetPhysicalInteractionLength(const G4Track& ,
                                   G4ForceCondition*) 
{
  return -1.0;
}
  
G4VParticleChange* G4WeightWindowProcess::
AtRestDoIt(const G4Track&, const G4Step&) 
{
  return 0;
}

G4VParticleChange* G4WeightWindowProcess::
AlongStepDoIt(const G4Track& track, const G4Step&)
{
  // Dummy ParticleChange ie: does nothing
  // Expecting G4Transportation to move the track
  pParticleChange->Initialize(track);
  return pParticleChange; 

  //  return 0;
}

void G4WeightWindowProcess::CopyStep(const G4Step & step)
{
  fGhostStep->SetTrack(step.GetTrack());
  fGhostStep->SetStepLength(step.GetStepLength());
  fGhostStep->SetTotalEnergyDeposit(step.GetTotalEnergyDeposit());
  fGhostStep->SetControlFlag(step.GetControlFlag());

  *fGhostPreStepPoint = *(step.GetPreStepPoint());
  *fGhostPostStepPoint = *(step.GetPostStepPoint());

//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
// Set StepStatus for ghost world
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  if(fOnBoundary)
  { fGhostPostStepPoint->SetStepStatus(fGeomBoundary); }
  else if(fGhostPostStepPoint->GetStepStatus()==fGeomBoundary)
  { fGhostPostStepPoint->SetStepStatus(fPostStepDoItProc); }
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
}

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