HGTDSensorGmxSD.cxx

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/*
  Copyright (C) 2002-2025 CERN for the benefit of the ATLAS collaboration
*/
 
// HGTD Sensitive Detector.
// The Hits are processed here. For every hit, the position and information
// on the sensor in which the interaction happened are obtained.
 
// Class header
#include "HGTDSensorGmxSD.h"
 
// Athena headers
#include "MCTruth/TrackHelper.h"
 
// Geant4 headers
#include "G4ChargedGeantino.hh"
#include "G4Geantino.hh"
#include "G4SDManager.hh"
#include "G4Step.hh"
#include "G4VisExtent.hh" // Added to get extent of sensors
#include "G4VSolid.hh" // Added to get extent of sensors
 
// GeoModel headers
#include <GeoModelKernel/GeoFullPhysVol.h>
#include <GeoModelRead/ReadGeoModel.h>
 
#include <InDetSimEvent/SiHitIdHelper.h>
 
// CLHEP headers
#include "CLHEP/Geometry/Transform3D.h"
#include "CLHEP/Units/SystemOfUnits.h"
#include <stdint.h>
#include <string.h>
 
HGTDSensorGmxSD::HGTDSensorGmxSD(const std::string& name, const std::string& hitCollectionName, GeoModelIO::ReadGeoModel * sqlreader)
    : G4VSensitiveDetector( name ), 
      m_HitColl( hitCollectionName ),
      m_sqlreader( sqlreader )
{
 
}
 
// Initialize from G4
void HGTDSensorGmxSD::Initialize(G4HCofThisEvent *)
{
    if (!m_HitColl.isValid()) m_HitColl = std::make_unique<SiHitCollection>();
}
 
G4bool HGTDSensorGmxSD::ProcessHits(G4Step* aStep, G4TouchableHistory* /*ROhist*/)
{
    if (verboseLevel>5) G4cout << "Process Hit" << G4endl;
 
    G4double edep = aStep->GetTotalEnergyDeposit();
    edep *= CLHEP::MeV;
 
    if (edep==0.) {
        if (aStep->GetTrack()->GetDefinition() != G4Geantino::GeantinoDefinition() &&
            aStep->GetTrack()->GetDefinition() != G4ChargedGeantino::ChargedGeantinoDefinition())
            return false;
    }
 
    //
    // Get the Touchable History:
    //
    const G4TouchableHistory*  myTouch = dynamic_cast<const G4TouchableHistory*>(aStep->GetPreStepPoint()->GetTouchable());
    if (not myTouch){
      G4cout<<"HGTDSensorGmxSD::ProcessHits: dynamic cast failed"<<G4endl;
      return false;
    }
    if(verboseLevel>5){
        for (int i=0;i<myTouch->GetHistoryDepth();i++){
            std::string detname = myTouch->GetVolume(i)->GetLogicalVolume()->GetName();
            int copyno = myTouch->GetVolume(i)->GetCopyNo();
            G4cout << "Volume " << detname << " Copy Nr. " << copyno << G4endl;
        }
    }
 
    //
    // Get the hit coordinates. Start and End Point
    //
    G4ThreeVector startCoord = aStep->GetPreStepPoint()->GetPosition();
    G4ThreeVector endCoord   = aStep->GetPostStepPoint()->GetPosition();
 
    // Create the SiHits
 
    const G4AffineTransform transformation = myTouch->GetHistory()->GetTopTransform();
 
    G4ThreeVector localPosition1 = transformation.TransformPoint(startCoord);
    G4ThreeVector localPosition2 = transformation.TransformPoint(endCoord);
 
    HepGeom::Point3D<double> lP1,lP2;
    //TODO need to check
    lP1[SiHit::xEta] = localPosition1[1]*CLHEP::mm; //long edge of the module
    lP1[SiHit::xPhi] = localPosition1[0]*CLHEP::mm; //short edge of the module
    lP1[SiHit::xDep] = localPosition1[2]*CLHEP::mm; //depth (z)
 
    lP2[SiHit::xEta] = localPosition2[1]*CLHEP::mm;
    lP2[SiHit::xPhi] = localPosition2[0]*CLHEP::mm;
    lP2[SiHit::xDep] = localPosition2[2]*CLHEP::mm;
 
    // get the HepMcParticleLink from the TrackHelper
    TrackHelper trHelp(aStep->GetTrack());
 
    if(m_sqlreader){
        // if sqlite inputs, Identifier indices come from PhysVol Name
        std::string physVolName = myTouch->GetVolume()->GetName();
 
        int hitIdOfWafer = SiHitIdHelper::GetHelper()->buildHitIdFromStringHGTD(2,physVolName);
 
        m_HitColl->Emplace(lP1,
                           lP2,
                           edep,
                           aStep->GetPreStepPoint()->GetGlobalTime(),
                           trHelp.GenerateParticleLink(),
                           hitIdOfWafer);
        
        return true;
    }
  
    // if not from SQLite, we assume that the Identifier has already been written in as the copy number 
    // (it should hsave done if GeoModel building ran within Athena)
    //
    //    Get the indexes of which detector the hit is in
    //
    const int id = myTouch->GetVolume()->GetCopyNo();
 
    m_HitColl->Emplace(lP1,
                       lP2,
                       edep,
                       aStep->GetPreStepPoint()->GetGlobalTime(),
                       trHelp.GenerateParticleLink(),
                       id);
 
    return true;
}