PHG4BlockSteppingAction.cc

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#include "PHG4BlockSteppingAction.h"

#include "PHG4BlockDetector.h"
#include "PHG4StepStatusDecode.h"

#include <phparameter/PHParameters.h>

#include <g4main/PHG4Hit.h>
#include <g4main/PHG4HitContainer.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, fPostSt...
#include <Geant4/G4String.hh>                  // for G4String
#include <Geant4/G4SystemOfUnits.hh>
#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/G4VPhysicalVolume.hh>         // for G4VPhysicalVolume
#include <Geant4/G4VTouchable.hh>              // for G4VTouchable
#include <Geant4/G4VUserTrackInformation.hh>   // for G4VUserTrackInformation

#include <cmath>                               // for isfinite
#include <cstdlib>                            // for exit
#include <iostream>
#include <string>                              // for operator<<, string

class PHCompositeNode;

using namespace std;
//____________________________________________________________________________..
PHG4BlockSteppingAction::PHG4BlockSteppingAction(PHG4BlockDetector* detector, const PHParameters* parameters)
  : PHG4SteppingAction(detector->GetName())
  , m_Detector(detector)
  , m_Params(parameters)
  , m_HitContainer(nullptr)
  , m_Hit(nullptr)
  , m_SaveShower(nullptr)
  , m_SaveVolPre(nullptr)
  , m_SaveVolPost(nullptr)
  , m_SaveTrackId(-1)
  , m_SavePreStepStatus(-1)
  , m_SavePostStepStatus(-1)
  , m_ActiveFlag(m_Params->get_int_param("active"))
  , m_BlackHoleFlag(m_Params->get_int_param("blackhole"))
  , m_UseG4StepsFlag(m_Params->get_int_param("use_g4steps"))
{
}

PHG4BlockSteppingAction::~PHG4BlockSteppingAction()
{
  // if the last hit was a zero energie deposit hit, it is just reset
  // and the memory is still allocated, so we need to delete it here
  // if the last hit was saved, hit is a nullptr pointer which are
  // legal to delete (it results in a no operation)
  delete m_Hit;
}

//____________________________________________________________________________..
bool PHG4BlockSteppingAction::UserSteppingAction(const G4Step* aStep, bool)
{
  G4TouchableHandle touch = aStep->GetPreStepPoint()->GetTouchableHandle();
  G4TouchableHandle touchpost = aStep->GetPostStepPoint()->GetTouchableHandle();
  // get volume of the current step
  G4VPhysicalVolume* volume = touch->GetVolume();

  if (!m_Detector->IsInBlock(volume))
  {
    return false;
  }

  // collect energy and track length step by step
  G4double edep = aStep->GetTotalEnergyDeposit() / GeV;
  G4double eion = (aStep->GetTotalEnergyDeposit() - aStep->GetNonIonizingEnergyDeposit()) / GeV;
  const G4Track* aTrack = aStep->GetTrack();

  // if this block stops everything, just put all kinetic energy into edep
  if (m_BlackHoleFlag)
  {
    edep = aTrack->GetKineticEnergy() / GeV;
    G4Track* killtrack = const_cast<G4Track*>(aTrack);
    killtrack->SetTrackStatus(fStopAndKill);
  }

  // make sure we are in a volume
  if (m_ActiveFlag)
  {
    int layer_id = m_Detector->get_Layer();
    bool geantino = false;
    // the check for the pdg code speeds things up, I do not want to make
    // an expensive string compare for every track when we know
    // geantino or chargedgeantino has pid=0
    if (aTrack->GetParticleDefinition()->GetPDGEncoding() == 0 &&
        aTrack->GetParticleDefinition()->GetParticleName().find("geantino") != string::npos)
    {
      geantino = true;
    }
    G4StepPoint* prePoint = aStep->GetPreStepPoint();
    G4StepPoint* postPoint = aStep->GetPostStepPoint();
    //       cout << "track id " << aTrack->GetTrackID() << endl;
    //       cout << "time prepoint: " << prePoint->GetGlobalTime() << endl;
    //       cout << "time postpoint: " << postPoint->GetGlobalTime() << endl;
    int prepointstatus = prePoint->GetStepStatus();
    if (prepointstatus == fGeomBoundary ||
        prepointstatus == fUndefined ||
        (prepointstatus == fPostStepDoItProc && m_SavePostStepStatus == fGeomBoundary) ||
        m_UseG4StepsFlag > 0)
    {
      if (prepointstatus == fPostStepDoItProc && m_SavePostStepStatus == fGeomBoundary)
      {
        cout << GetName() << ": New Hit for  " << endl;
        cout << "prestep status: " << PHG4StepStatusDecode::GetStepStatus(prePoint->GetStepStatus())
             << ", poststep status: " << PHG4StepStatusDecode::GetStepStatus(postPoint->GetStepStatus())
             << ", last pre step status: " << PHG4StepStatusDecode::GetStepStatus(m_SavePreStepStatus)
             << ", last post step status: " << PHG4StepStatusDecode::GetStepStatus(m_SavePostStepStatus) << endl;
        cout << "last track: " << m_SaveTrackId
             << ", current trackid: " << aTrack->GetTrackID() << endl;
        cout << "phys pre vol: " << volume->GetName()
             << " post vol : " << touchpost->GetVolume()->GetName() << endl;
        cout << " previous phys pre vol: " << m_SaveVolPre->GetName()
             << " previous phys post vol: " << m_SaveVolPost->GetName() << endl;
      }
      if (!m_Hit)
      {
        m_Hit = new PHG4Hitv1();
      }
      m_Hit->set_layer(layer_id);
      //here we set the entrance values in cm
      m_Hit->set_x(0, prePoint->GetPosition().x() / cm);
      m_Hit->set_y(0, prePoint->GetPosition().y() / cm);
      m_Hit->set_z(0, prePoint->GetPosition().z() / cm);
      // time in ns
      m_Hit->set_t(0, prePoint->GetGlobalTime() / nanosecond);
      //set the track ID
      m_Hit->set_trkid(aTrack->GetTrackID());
      m_SaveTrackId = aTrack->GetTrackID();

      //set the initial energy deposit
      m_Hit->set_edep(0);
      if (!geantino && !m_BlackHoleFlag && m_ActiveFlag)
      {
        m_Hit->set_eion(0);
      }
      if (G4VUserTrackInformation* p = aTrack->GetUserInformation())
      {
        if (PHG4TrackUserInfoV1* pp = dynamic_cast<PHG4TrackUserInfoV1*>(p))
        {
          m_Hit->set_trkid(pp->GetUserTrackId());
          m_Hit->set_shower_id(pp->GetShower()->get_id());
          m_SaveShower = pp->GetShower();
        }
      }
    }

    // some sanity checks for inconsistencies
    // check if this hit was created, if not print out last post step status
    if (!m_Hit || !isfinite(m_Hit->get_x(0)))
    {
      cout << GetName() << ": hit was not created" << endl;
      cout << "prestep status: " << PHG4StepStatusDecode::GetStepStatus(prePoint->GetStepStatus())
           << ", poststep status: " << PHG4StepStatusDecode::GetStepStatus(postPoint->GetStepStatus())
           << ", last pre step status: " << PHG4StepStatusDecode::GetStepStatus(m_SavePreStepStatus)
           << ", last post step status: " << PHG4StepStatusDecode::GetStepStatus(m_SavePostStepStatus) << endl;
      cout << "last track: " << m_SaveTrackId
           << ", current trackid: " << aTrack->GetTrackID() << endl;
      cout << "phys pre vol: " << volume->GetName()
           << " post vol : " << touchpost->GetVolume()->GetName() << endl;
      cout << " previous phys pre vol: " << m_SaveVolPre->GetName()
           << " previous phys post vol: " << m_SaveVolPost->GetName() << endl;
      exit(1);
    }
    m_SavePostStepStatus = postPoint->GetStepStatus();
    // check if track id matches the initial one when the hit was created
    if (aTrack->GetTrackID() != m_SaveTrackId)
    {
      cout << "hits do not belong to the same track" << endl;
      cout << "saved track: " << m_SaveTrackId
           << ", current trackid: " << aTrack->GetTrackID()
           << endl;
      exit(1);
    }
    m_SavePreStepStatus = prePoint->GetStepStatus();
    m_SavePostStepStatus = postPoint->GetStepStatus();
    m_SaveVolPre = volume;
    m_SaveVolPost = touchpost->GetVolume();

    // here we just update the exit values, it will be overwritten
    // for every step until we leave the volume or the particle
    // ceases to exist
    m_Hit->set_x(1, postPoint->GetPosition().x() / cm);
    m_Hit->set_y(1, postPoint->GetPosition().y() / cm);
    m_Hit->set_z(1, postPoint->GetPosition().z() / cm);

    m_Hit->set_t(1, postPoint->GetGlobalTime() / nanosecond);
    //sum up the energy to get total deposited
    m_Hit->set_edep(m_Hit->get_edep() + edep);
    // update ionization energy only for active volumes, not for black holes or geantinos
    // if the hit is created without eion, get_eion() returns NAN
    // if you see NANs check the creation of the hit
    if (m_ActiveFlag && !m_BlackHoleFlag && !geantino)
    {
      m_Hit->set_eion(m_Hit->get_eion() + eion);
    }
    if (geantino)
    {
      m_Hit->set_edep(-1);  // only energy=0 g4hits get dropped, this way geantinos survive the g4hit compression
    }
    if (edep > 0)
    {
      if (G4VUserTrackInformation* p = aTrack->GetUserInformation())
      {
        if (PHG4TrackUserInfoV1* pp = dynamic_cast<PHG4TrackUserInfoV1*>(p))
        {
          pp->SetKeep(1);  // we want to keep the track
        }
      }
    }
    // if any of these conditions is true this is the last step in
    // this volume and we need to save the hit
    // postPoint->GetStepStatus() == fGeomBoundary: track leaves this volume
    // postPoint->GetStepStatus() == fWorldBoundary: track leaves this world
    // (happens when your detector goes outside world volume)
    // postPoint->GetStepStatus() == fAtRestDoItProc: track stops (typically
    // aTrack->GetTrackStatus() == fStopAndKill is also set)
    // aTrack->GetTrackStatus() == fStopAndKill: track ends
    if (postPoint->GetStepStatus() == fGeomBoundary ||
        postPoint->GetStepStatus() == fWorldBoundary ||
        postPoint->GetStepStatus() == fAtRestDoItProc ||
        aTrack->GetTrackStatus() == fStopAndKill ||
        m_UseG4StepsFlag > 0)
    {
      // save only hits with energy deposit (or -1 for geantino)
      if (m_Hit->get_edep())
      {
        m_HitContainer->AddHit(layer_id, m_Hit);
        if (m_SaveShower)
        {
          m_SaveShower->add_g4hit_id(m_HitContainer->GetID(), m_Hit->get_hit_id());
        }
        // ownership has been transferred to container, set to null
        // so we will create a new hit for the next track
        m_Hit = nullptr;
      }
      else
      {
        // if this hit has no energy deposit, just reset it for reuse
        // this means we have to delete it in the dtor. If this was
        // the last hit we processed the memory is still allocated
        m_Hit->Reset();
      }
    }
    // return true to indicate the hit was used
    return true;
  }
  else
  {
    return false;
  }
}

//____________________________________________________________________________..
void PHG4BlockSteppingAction::SetInterfacePointers(PHCompositeNode* topNode)
{
  string hitnodename;
  if (m_Detector->SuperDetector() != "NONE")
  {
    hitnodename = "G4HIT_" + m_Detector->SuperDetector();
  }
  else
  {
    hitnodename = "G4HIT_" + m_Detector->GetName();
  }

  //now look for the map and grab a pointer to it.
  m_HitContainer = findNode::getClass<PHG4HitContainer>(topNode, hitnodename.c_str());

  // if we do not find the node we need to make it.
  if (!m_HitContainer)
  {
    std::cout << "PHG4BlockSteppingAction::SetTopNode - unable to find " << hitnodename << std::endl;
  }
}