TrackWithHistory.cc

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#include "SimG4Core/Notification/interface/TrackWithHistory.h"
#include "SimG4Core/Notification/interface/G4TrackToParticleID.h"
#include "SimG4Core/Notification/interface/TrackInformationExtractor.h"
#include "SimG4Core/Notification/interface/SimG4Exception.h"
#include "SimG4Core/Notification/interface/GenParticleInfoExtractor.h"

#include "FWCore/MessageLogger/interface/MessageLogger.h"

#include "G4VProcess.hh"

#include <iostream>

G4ThreadLocal G4Allocator<TrackWithHistory>* fpTrackWithHistoryAllocator = nullptr;

//#define DEBUG

TrackWithHistory::TrackWithHistory(const G4Track* g4trk)
    : trackID_(0),
      particleID_(0),
      parentID_(0),
      momentum_(math::XYZVectorD(0., 0., 0.)),
      totalEnergy_(0),
      vertexPosition_(math::XYZVectorD(0., 0., 0.)),
      globalTime_(0),
      localTime_(0),
      properTime_(0),
      creatorProcess_(nullptr),
      weight_(0),
      storeTrack_(false),
      saved_(false) {
  if (g4trk != nullptr) {
    TrackInformationExtractor extractor;
    trackID_ = g4trk->GetTrackID();
    particleID_ = G4TrackToParticleID::particleID(g4trk);
    parentID_ = g4trk->GetParentID();
    momentum_ = math::XYZVectorD(g4trk->GetMomentum().x(), g4trk->GetMomentum().y(), g4trk->GetMomentum().z());
    totalEnergy_ = g4trk->GetTotalEnergy();
    vertexPosition_ = math::XYZVectorD(g4trk->GetPosition().x(), g4trk->GetPosition().y(), g4trk->GetPosition().z());
    globalTime_ = g4trk->GetGlobalTime();
    localTime_ = g4trk->GetLocalTime();
    properTime_ = g4trk->GetProperTime();
    creatorProcess_ = g4trk->GetCreatorProcess();
    storeTrack_ = extractor(g4trk).storeTrack();
    saved_ = false;
    crossedBoundary_ = false;
    genParticleID_ = extractGenID(g4trk);
    // V.I. weight is computed in the same way as before
    // without usage of G4Track::GetWeight()
    weight_ = 10000 * genParticleID_;
#ifdef DEBUG
    LogDebug("TrackInformation") << " TrackWithHistory : created history for " << trackID_ << " with mother "
                                 << parentID_;
#endif
  }
}

void TrackWithHistory::checkAtEnd(const G4Track* gt) {
  math::XYZVectorD vposdir(gt->GetVertexPosition().x(), gt->GetVertexPosition().y(), gt->GetVertexPosition().z());
  math::XYZVectorD vmomdir(
      gt->GetVertexMomentumDirection().x(), gt->GetVertexMomentumDirection().y(), gt->GetVertexMomentumDirection().z());
  bool ok = true;
  double epsilon = 1.e-6;
  double eps2 = epsilon * epsilon;
  if ((vertexPosition_ - vposdir).Mag2() > eps2) {
    edm::LogWarning("TrackInformation") << "TrackWithHistory vertex position check failed"
                                        << "\nAt construction: " << vertexPosition_ << "\nAt end:          " << vposdir;
    ok = false;
  }
  math::XYZVectorD dirDiff = momentum_.Unit() - vmomdir;
  if (dirDiff.Mag2() > eps2 && momentum_.Unit().R() > eps2) {
    edm::LogWarning("TrackInformation") << "TrackWithHistory momentum direction check failed"
                                        << "\nAt construction: " << momentum_.Unit()
                                        << "\nAt end:          " << vmomdir;
    ok = false;
  }
  if (!ok)
    throw SimG4Exception("TrackWithHistory::checkAtEnd failed");
}

int TrackWithHistory::extractGenID(const G4Track* gt) const {
  void* vgprimary = gt->GetDynamicParticle()->GetPrimaryParticle();
  if (vgprimary == nullptr)
    return -1;
  // replace old-style cast with appropriate new-style cast...
  G4PrimaryParticle* gprimary = (G4PrimaryParticle*)vgprimary;
  GenParticleInfoExtractor ext;
  return ext(gprimary).id();
}