PHG4EnvelopeSteppingAction.cc

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#include "PHG4EnvelopeSteppingAction.h"
#include "PHG4EnvelopeDetector.h"

#include <g4main/PHG4HitContainer.h>
#include <g4main/PHG4Hit.h>
#include <g4main/PHG4Hitv1.h>
#include <g4main/PHG4Shower.h>
#include <g4main/PHG4SteppingAction.h>         // for PHG4SteppingAction

#include <g4main/PHG4TrackUserInfoV1.h>

#include <phool/getClass.h>

#include <Geant4/G4ParticleDefinition.hh>      // for G4ParticleDefinition
#include <Geant4/G4ReferenceCountedHandle.hh>  // for G4ReferenceCountedHandle
#include <Geant4/G4Step.hh>
#include <Geant4/G4StepPoint.hh>               // for G4StepPoint
#include <Geant4/G4StepStatus.hh>              // for fGeomBoundary, fUndefined
#include <Geant4/G4String.hh>                  // for G4String
#include <Geant4/G4SystemOfUnits.hh>       // for mm, m
#include <Geant4/G4ThreeVector.hh>             // for G4ThreeVector
#include <Geant4/G4TouchableHandle.hh>         // for G4TouchableHandle
#include <Geant4/G4Track.hh>                   // for G4Track
#include <Geant4/G4TrackStatus.hh>             // for fStopAndKill
#include <Geant4/G4Types.hh>                   // for G4double
#include <Geant4/G4VTouchable.hh>              // for G4VTouchable
#include <Geant4/G4VUserTrackInformation.hh>   // for G4VUserTrackInformation

#include <iostream>
#include <string>                              // for string, operator+, ope...

class G4VPhysicalVolume;
class PHCompositeNode;

using namespace std;

//______________________________________________________________
PHG4EnvelopeSteppingAction::PHG4EnvelopeSteppingAction( PHG4EnvelopeDetector* detector ):
  PHG4SteppingAction(detector->GetName()),
  detector_( detector ),
  hits_(nullptr),
  hit(nullptr)
{
}

//____________________________________________________________________________..
bool PHG4EnvelopeSteppingAction::UserSteppingAction( const G4Step* aStep, bool )
{
  G4TouchableHandle touch = aStep->GetPreStepPoint()->GetTouchableHandle();
  G4VPhysicalVolume* volume = touch->GetVolume();
  
  int whichactive = detector_->IsInEnvelope(volume);

  if ( !whichactive  )
    {
      return false;
    }
  
  int layer_id = detector_->get_Layer();
  int tower_id = touch->GetCopyNumber();

  /* Get energy deposited by this step */
  //G4double edep = aStep->GetTotalEnergyDeposit() / GeV;
  G4double eion = (aStep->GetTotalEnergyDeposit() - aStep->GetNonIonizingEnergyDeposit()) / GeV;

  /* Get pointer to associated Geant4 track */
  const G4Track* aTrack = aStep->GetTrack();
  
  //This detector is a black hole! Just put all kinetic energy into edep
  G4double edep = aTrack->GetKineticEnergy() / GeV;
  G4Track* killtrack = const_cast<G4Track *> (aTrack);
  killtrack->SetTrackStatus(fStopAndKill);
  
  /* Make sure we are in a volume */
  if ( detector_->IsActive() )
    {
      /* Check if particle is 'geantino' */
      bool geantino = false;
      if (aTrack->GetParticleDefinition()->GetPDGEncoding() == 0 && aTrack->GetParticleDefinition()->GetParticleName().find("geantino") != string::npos)
  {
    geantino = true;
  }

      /* Get Geant4 pre- and post-step points */
      G4StepPoint * prePoint = aStep->GetPreStepPoint();
      G4StepPoint * postPoint = aStep->GetPostStepPoint();

      switch (prePoint->GetStepStatus())
  {
  case fGeomBoundary:
  case fUndefined:
    hit = new PHG4Hitv1();
    //    hit->set_layer(0);
    hit->set_scint_id(tower_id);

    /* Set hit location (tower index) */
    //hit->set_index_j(idx_j);
    //hit->set_index_k(idx_k);
    //hit->set_index_l(idx_l);
    hit->set_index_j(0);
    hit->set_index_k(0);
    hit->set_index_l(0);

    /* Set hit location (space point) */
    hit->set_x( 0, prePoint->GetPosition().x() / cm);
    hit->set_y( 0, prePoint->GetPosition().y() / cm );
    hit->set_z( 0, prePoint->GetPosition().z() / cm );

    /* Set momentum */
    hit->set_x( 0, prePoint->GetMomentum().x() / GeV );
    hit->set_y( 0, prePoint->GetMomentum().y() / GeV );
    hit->set_z( 0, prePoint->GetMomentum().z() / GeV );

    /* Set hit time */
    hit->set_t( 0, prePoint->GetGlobalTime() / nanosecond );

    /* set the track ID */
    {
      hit->set_trkid(aTrack->GetTrackID());
      if ( G4VUserTrackInformation* p = aTrack->GetUserInformation() )
        {
    if ( PHG4TrackUserInfoV1* pp = dynamic_cast<PHG4TrackUserInfoV1*>(p) )
      {
        hit->set_trkid(pp->GetUserTrackId());
        hit->set_shower_id(pp->GetShower()->get_id());
      }
        }
    }

    /* set intial energy deposit */
    hit->set_edep( 0 );
    hit->set_eion( 0 );

    hits_->AddHit(layer_id, hit);
    
    {
      if ( G4VUserTrackInformation* p = aTrack->GetUserInformation() )
        {
    if ( PHG4TrackUserInfoV1* pp = dynamic_cast<PHG4TrackUserInfoV1*>(p) )
      {
        pp->GetShower()->add_g4hit_id(hits_->GetID(),hit->get_hit_id());
      }
        }
    }
    
    break;
  default:
    break;
  }

      /* Update exit values- will be overwritten with every step until
       * we leave the volume or the particle ceases to exist */
      hit->set_x( 1, postPoint->GetPosition().x() / cm );
      hit->set_y( 1, postPoint->GetPosition().y() / cm );
      hit->set_z( 1, postPoint->GetPosition().z() / cm );

      hit->set_t( 1, postPoint->GetGlobalTime() / nanosecond );

      /* sum up the energy to get total deposited */
      hit->set_edep(hit->get_edep() + edep);
      hit->set_eion(hit->get_eion() + eion);

      if (geantino)
  {
    hit->set_edep(-1); // only energy=0 g4hits get dropped, this way geantinos survive the g4hit compression
    hit->set_eion(-1);
  }
      if (edep > 0)
  {
    if ( G4VUserTrackInformation* p = aTrack->GetUserInformation() )
      {
        if ( PHG4TrackUserInfoV1* pp = dynamic_cast<PHG4TrackUserInfoV1*>(p) )
    {
      pp->SetKeep(1); // we want to keep the track
    }
      }
  }
      return true;
    }
  else
    {
      return false;
    }
}
  
void PHG4EnvelopeSteppingAction::SetInterfacePointers( PHCompositeNode* topNode )
{
  string hitnodename;

  if (detector_->SuperDetector() != "NONE")
    {
      hitnodename = "G4HIT_ENVELOPE_" + detector_->SuperDetector();
    }
  else
    {
      hitnodename = "G4HIT_ENVELOPE_" + detector_->GetName();
    }
  
  hits_ =  findNode::getClass<PHG4HitContainer>( topNode , hitnodename.c_str() );

  // if we do not find the node it's messed up.
  if ( ! hits_ )
    {
      std::cout << "PHG4CrystalCalorimeterSteppingAction::SetTopNode - unable to find " << hitnodename << std::endl;
    }
  
  
}