VP1SimHitSystem.cxx

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/*
  Copyright (C) 2002-2026 CERN for the benefit of the ATLAS collaboration
*/
 
/*
 * Major updates:
 * - 2022 Jan, Riccardo Maria Bianchi <riccardo.maria.bianchi@cern.ch>
 *             Added visualization for Calorimeters' sim hits
 * - 2026 Apr, Riccardo Maria Bianchi <riccardo.maria.bianchi@cern.ch>
 *             Added ITk simHits
 *
 */
#include "VP1SimHitSystems/VP1SimHitSystem.h"
#include "ui_simhitcontrollerform.h"
 
#include "VP1Utils/VP1SGContentsHelper.h"
#include "VP1Utils/VP1JobConfigInfo.h"
#include "VP1Base/VP1Msg.h"
#include "VP1UtilsCoinSoQt/VP1ColorUtils.h"
#include "StoreGate/StoreGateSvc.h"
#include "StoreGate/ReadHandleKey.h"
 
#include "InDetSimEvent/SiHitCollection.h"
#include "InDetSimEvent/TRTUncompressedHitCollection.h"
#include "GeoAdaptors/GeoTRTUncompressedHit.h"
#include "GeoAdaptors/GeoSiHit.h"
#include "GeoAdaptors/GeoMuonHits.h"
#include "TRT_ReadoutGeometry/TRT_DetectorManager.h"
 
// Section of includes for global calo hits
#include "CaloDetDescr/CaloDetDescrElement.h"
#include "CaloDetDescr/CaloDetDescrManager.h"
#include "CaloDetDescrUtils/CaloDetDescrBuilder.h"
 
// Section of includes for LAr calo hits
#include "LArSimEvent/LArHit.h"
#include "LArSimEvent/LArHitContainer.h"
 
// Section of includes for Tile calo hits
#include "TileDetDescr/TileDetDescrManager.h"
#include "CaloIdentifier/TileID.h"
#include "TileSimEvent/TileHit.h"
#include "TileSimEvent/TileHitVector.h"
 
#include "MuonSimEvent/MDTSimHitCollection.h"
#include "MuonSimEvent/RPCSimHitCollection.h"
#include "MuonSimEvent/TGCSimHitCollection.h"
#include "MuonSimEvent/CSCSimHitCollection.h"
#include "MuonSimEvent/GenericMuonSimHitCollection.h"
 
#include "ForwardRegion_SimEv/SimulationHitCollection.h"
 
#include "GeoPrimitives/GeoPrimitives.h"
 
#include <Inventor/C/errors/debugerror.h>
#include <Inventor/nodes/SoDrawStyle.h>
#include <Inventor/nodes/SoMaterial.h>
#include <Inventor/nodes/SoSeparator.h>
#include <Inventor/nodes/SoSwitch.h>
#include <Inventor/nodes/SoVertexProperty.h>
#include <Inventor/nodes/SoPointSet.h>
#include <Inventor/SbColor.h>
 
// Qt includes
#include <QMap>
#include <QSet>
 
// C++ includes
#include <string>
 
 
class VP1SimHitSystem::Clockwork
{
public:
  QMap<QString,SoSwitch*>    switchMap;
  QMap<QString,SbColor>      colorMap;
  QMap<QCheckBox*,QString>   checkBoxNamesMap;
  QMap<QString,QCheckBox*>   checkBoxMap;
  QSet<QString>              hitsThisEvent;
  StoreGateSvc * sg = nullptr;
 
  // Managers
  const TileDetDescrManager* tile_dd_man{nullptr};
  const InDetDD::TRT_DetectorManager* trt_dd_man{nullptr};
  std::unique_ptr<CaloDetDescrManager> lar_dd_man;
 
  // ID helpers
  const TileID*              tile_id{nullptr};
 
};
 
VP1SimHitSystem::VP1SimHitSystem()
  :IVP13DSystemSimple("Sim Hits","Display simulation hits from trackers and calorimeters","Vakho Tsulaia <Vakhtang.Tsulaia@cern.ch>, Riccardo Maria Bianchi <Riccardo.Maria.Bianchi@cern.ch>"),
   m_clockwork(new Clockwork())
{
}
 
VP1SimHitSystem::~VP1SimHitSystem()
{
  delete m_clockwork;
  m_clockwork = 0;
}
 
QWidget* VP1SimHitSystem::buildController()
{
  QWidget* controller = new QWidget(0);
  Ui::SimHitControllerForm ui;
  ui.setupUi(controller);
 
  // Show/Hide checkboxes
  // based on geometry being used
  ui.chbxITkPixelHits->setVisible(VP1JobConfigInfo::hasITkGeometry());
  ui.chbxITkStripHits->setVisible(VP1JobConfigInfo::hasITkGeometry());
  ui.chbxPixelHits->setVisible(VP1JobConfigInfo::hasPixelGeometry());
  ui.chbxSCTHits->setVisible(VP1JobConfigInfo::hasSCTGeometry());
  ui.chbxTRTHits->setVisible(VP1JobConfigInfo::hasTRTGeometry());
  ui.chbxHGTDHits->setVisible(VP1JobConfigInfo::hasHGTDGeometry());
 
  // Populate Check Box Names Map
  if (VP1JobConfigInfo::hasITkGeometry()) {
    m_clockwork->checkBoxNamesMap.insert(ui.chbxITkPixelHits,"ITkPixel");
    m_clockwork->checkBoxNamesMap.insert(ui.chbxITkStripHits,"ITkStrip");
  } else {
    m_clockwork->checkBoxNamesMap.insert(ui.chbxPixelHits,"Pixel");
    m_clockwork->checkBoxNamesMap.insert(ui.chbxSCTHits,"SCT");
    m_clockwork->checkBoxNamesMap.insert(ui.chbxTRTHits,"TRT");
  }
  if (VP1JobConfigInfo::hasHGTDGeometry()) {
    m_clockwork->checkBoxNamesMap.insert(ui.chbxHGTDHits,"HGTD");
  }
  m_clockwork->checkBoxNamesMap.insert(ui.chbxMDTHits,"MDT");
  m_clockwork->checkBoxNamesMap.insert(ui.chbxRPCHits,"RPC");
  m_clockwork->checkBoxNamesMap.insert(ui.chbxTGCHits,"TGC");
  m_clockwork->checkBoxNamesMap.insert(ui.chbxCSCHits,"CSC");
  m_clockwork->checkBoxNamesMap.insert(ui.chbxMMHits,"MM");
  m_clockwork->checkBoxNamesMap.insert(ui.chbxsTGCHits,"sTGC");
  m_clockwork->checkBoxNamesMap.insert(ui.chbxLArEMBHits,"LArEMB");
  m_clockwork->checkBoxNamesMap.insert(ui.chbxLArEMECHits,"LArEMEC");
  m_clockwork->checkBoxNamesMap.insert(ui.chbxLArFCALHits,"LArFCAL");
  m_clockwork->checkBoxNamesMap.insert(ui.chbxLArHECHits,"LArHEC");
  m_clockwork->checkBoxNamesMap.insert(ui.chbxTileHits,"Tile");
  m_clockwork->checkBoxNamesMap.insert(ui.chbxGenericMuonHits,"Generic Muon");
  m_clockwork->checkBoxNamesMap.insert(ui.chbxForwardRegionHits,"Forward Region");
 
  // Populate Check Box Map and connect slots
  for(QCheckBox* cb : m_clockwork->checkBoxNamesMap.keys())
  {
    connect(cb,SIGNAL(toggled(bool)),this,SLOT(checkboxChanged()));
    m_clockwork->checkBoxMap.insert(m_clockwork->checkBoxNamesMap[cb],cb);
  }
 
  return controller;
}
 
void VP1SimHitSystem::systemcreate(StoreGateSvc* detstore)
{
  // Populate Color Map
  if (VP1JobConfigInfo::hasITkGeometry()) {
    m_clockwork->colorMap.insert("ITkPixel",SbColor(1,1,1)); // white
    m_clockwork->colorMap.insert("ITkStrip",SbColor(VP1ColorUtils::getSbColorFromRGB(28, 162, 230))); // Carolina Blue
  } else {
    m_clockwork->colorMap.insert("Pixel",SbColor(0,0,1));
    m_clockwork->colorMap.insert("SCT",SbColor(1,1,1)); // white
    m_clockwork->colorMap.insert("TRT",SbColor(1,0,0)); // red
  }
  if (VP1JobConfigInfo::hasHGTDGeometry()) {
    m_clockwork->colorMap.insert("HGTD",SbColor(VP1ColorUtils::getSbColorFromRGB(255, 170, 0))); // amber
  }
  m_clockwork->colorMap.insert("MDT",SbColor(.98,.8,.21));
  m_clockwork->colorMap.insert("RPC",SbColor(0,.44,.28));
  m_clockwork->colorMap.insert("TGC",SbColor(0,.631244,.748016));
  m_clockwork->colorMap.insert("CSC",SbColor(.21,.64,1.));
  m_clockwork->colorMap.insert("MM",SbColor(VP1ColorUtils::getSbColorFromRGB(28, 162, 230))); // Carolina Blue 
  m_clockwork->colorMap.insert("sTGC",SbColor(VP1ColorUtils::getSbColorFromRGB(255, 255, 255))); // White
  m_clockwork->colorMap.insert("LArEMB",SbColor(VP1ColorUtils::getSbColorFromRGB(247, 187, 109))); // Mellow Apricot 
  m_clockwork->colorMap.insert("LArEMEC",SbColor(VP1ColorUtils::getSbColorFromRGB(230, 151, 48))); // Carrot Orange
  m_clockwork->colorMap.insert("LArFCAL",SbColor(VP1ColorUtils::getSbColorFromRGB(212, 134, 32))); // Fulvous
  m_clockwork->colorMap.insert("LArHEC",SbColor(VP1ColorUtils::getSbColorFromRGB(184, 114, 24))); // Copper
  //m_clockwork->colorMap.insert("Tile",SbColor(VP1ColorUtils::getSbColorFromRGB(28, 162, 230))); // Carolina Blue --> Note: this is nice, but it disappears when superimposed to the azure Tile geometry default material
  m_clockwork->colorMap.insert("Tile",SbColor(VP1ColorUtils::getSbColorFromRGB(164, 78, 207))); // Purple Plum
  m_clockwork->colorMap.insert("Generic Muon",SbColor(.21,.64,1.));
  m_clockwork->colorMap.insert("Forward Region",SbColor(.21,.64,1.));
 
 
  // ------------- DD Managers and ID Helpers -------------
  StatusCode status = detstore->retrieve(m_clockwork->tile_dd_man);
  if(status.isFailure() || m_clockwork->tile_dd_man==nullptr) {
      //m_clockwork->noCalo = true;
      messageDebug("Unable to retrieve Tile DD Manager");
      return;
  }
  m_clockwork->tile_id = m_clockwork->tile_dd_man->get_id();
  if(m_clockwork->tile_id==nullptr) {
      //m_clockwork->noCalo = true;
      messageDebug("0 pointer to Tile ID Helper");
      return;
  }
  status = detstore->retrieve(m_clockwork->trt_dd_man,"TRT");
  if(status.isFailure() || m_clockwork->trt_dd_man==nullptr) {
      messageDebug("Unable to retrieve TRT DD Manager");
      return;
  }
  m_clockwork->lar_dd_man = buildCaloDetDescrNoAlign(serviceLocator(),Athena::getMessageSvc());
}
 
void VP1SimHitSystem::buildEventSceneGraph(StoreGateSvc* sg, SoSeparator *root)
{
  // --- Draw style: POINTS
  SoDrawStyle* ds = new SoDrawStyle();
  ds->style.setValue(SoDrawStyle::POINTS);
  ds->pointSize=4;
  root->addChild(ds);
 
  // Keep SG pointer
  m_clockwork->sg = sg;
 
  // clean up
  m_clockwork->switchMap.clear();
  m_clockwork->hitsThisEvent.clear();
 
  if(!sg)
  {
    message("0 pointer to the Store Gate!");
    return;
  }
 
  for(const QString& detector : m_clockwork->checkBoxMap.keys())
  {
    // Add switch, off by default
    SoSwitch* sw = new SoSwitch();
    sw->whichChild = SO_SWITCH_NONE;
    root->addChild(sw);
    m_clockwork->switchMap.insert(detector,sw);
 
    // Build subtree if the check box is ON
    if(m_clockwork->checkBoxMap.contains(detector) &&
       m_clockwork->checkBoxMap[detector]->isChecked())
    {
      buildHitTree(detector);
      sw->whichChild = SO_SWITCH_ALL;
    }
    updateGUI();
  }
}
 
void VP1SimHitSystem::checkboxChanged()
{
  // Get ChB pointer
  QCheckBox* cb = dynamic_cast<QCheckBox*>(sender());
  if(cb && m_clockwork->checkBoxNamesMap.contains(cb))
  {
    // Get detector name
    QString detector = m_clockwork->checkBoxNamesMap[cb];
    if(m_clockwork->switchMap.contains(detector))
    {
      // Get swtich
      SoSwitch* sw = m_clockwork->switchMap[detector];
      if(cb->isChecked()){
  // Build subtree if necessary
        if(!m_clockwork->hitsThisEvent.contains(detector))
          buildHitTree(detector);
        sw->whichChild = SO_SWITCH_ALL;
      }
      else
        sw->whichChild = SO_SWITCH_NONE;
    } else {
      message("WARNING: Unknown detector:"+detector);
    }
  }
}
 
void VP1SimHitSystem::fillHitPositionsFromSiHitCollection(const std::string& collName, const StoreGateSvc* sg, SoVertexProperty* hitVtxProperty, unsigned int & hitCount)
{
  const char* collNameChar = collName.c_str();
  const SiHitCollection *p_collection = nullptr;
  if (sg->retrieve(p_collection, collName) == StatusCode::SUCCESS)
  {
    for (const SiHit &hit : *p_collection)
    {
      GeoSiHit ghit(hit);
      if (!ghit)
        continue;
      HepGeom::Point3D<double> u = ghit.getGlobalPosition();
      hitVtxProperty->vertex.set1Value(hitCount++, u.x(), u.y(), u.z());
    }
    message("Event contains " + str(p_collection->size()) + " entries in " + str(collNameChar) );
  }
  else
    message("Unable to retrieve '" + str(collNameChar) + "' Hits");
}
 
void VP1SimHitSystem::buildHitTree(const QString& detector)
{
  messageVerbose("buildHitTree for "+detector);
  if(m_clockwork->hitsThisEvent.contains(detector)) {
    messageVerbose(" in hitsThisEvent"); return;
  }
  if(!m_clockwork->colorMap.contains(detector)) {
    messageVerbose("not in colorMap"); return;
  }
  if(!m_clockwork->switchMap.contains(detector)) {
    messageVerbose("not in switchMap"); return;
  }
 
  // -- Initializations
  StoreGateSvc* sg = m_clockwork->sg;
  SoSwitch* sw = m_clockwork->switchMap[detector];
  unsigned int hitCount = 0;
 
  SoVertexProperty* hitVtxProperty = new SoVertexProperty();
  SoPointSet* hitPointSet    = new SoPointSet();
 
  hitVtxProperty->enableNotify(FALSE);
  hitPointSet->enableNotify(FALSE);
 
  // -- COLOR
  SoMaterial* material = new SoMaterial();
  material->diffuseColor.setValue(m_clockwork->colorMap[detector]);
 
  sw->addChild(material);
 
  // Take hits from SG
  if(detector=="ITkPixel")
  {
    fillHitPositionsFromSiHitCollection( "ITkPixelHits", sg, hitVtxProperty, hitCount);
  }
  else if(detector=="ITkStrip")
  {
    fillHitPositionsFromSiHitCollection("ITkStripHits", sg, hitVtxProperty, hitCount);
  }
  else if(detector=="Pixel")
  {
    fillHitPositionsFromSiHitCollection("PixelHits", sg, hitVtxProperty, hitCount);
  }
  else if(detector=="SCT")
  {
    fillHitPositionsFromSiHitCollection("SCT_Hits", sg, hitVtxProperty, hitCount);
  }
  else if(detector=="TRT")
  {
    //
    // TRT:
    //
    const TRTUncompressedHitCollection* t_collection = nullptr;
    if(sg->retrieve(t_collection,"TRTUncompressedHits")==StatusCode::SUCCESS)
    {
      for (const TRTUncompressedHit& hit : *t_collection)
      {
        GeoTRTUncompressedHit ghit(hit);
        if(!ghit) continue;
        Amg::Vector3D u = Amg::Hep3VectorToEigen(ghit.getGlobalPosition(m_clockwork->trt_dd_man));
        hitVtxProperty->vertex.set1Value(hitCount++,u.x(),u.y(),u.z());
      }
    }
    else
      message("Unable to retrieve TRT Hits");
  }
  else if(detector=="HGTD")
  {
    //
    // HGTD:
    //
    const SiHitCollection* p_collection = nullptr;
    if(sg->retrieve(p_collection,"HGTD_Hits")==StatusCode::SUCCESS)
    {
      for (const SiHit& hit : *p_collection)
      {
        GeoSiHit ghit(hit);
        if(!ghit) continue;
        HepGeom::Point3D<double> u = ghit.getGlobalPosition();
        hitVtxProperty->vertex.set1Value(hitCount++,u.x(),u.y(),u.z());
      }
    }
    else
      message("Unable to retrieve HGTD Hits");
  }
  else if(detector=="LArEMB" || detector=="LArEMEC" || detector=="LArFCAL" || detector=="LArHEC" )
  {
    //
    // LAr:
    //
    // NOTE: to access additional LAr simHit data, see: 
    // Simulation/Tools/HitAnalysis/src/CaloHitAnalysis.cxx
    //
    const LArHitContainer* lar_collection;
 
    std::string collName{"LArHit"};
    std::string suff{""};
 
    if (detector=="LArEMB")
         suff = "EMB";
    else if (detector=="LArEMEC")
         suff = "EMEC";
    else if (detector=="LArFCAL")
         suff = "FCAL";
    else if (detector=="LArHEC")
         suff = "HEC";
    collName += suff; // e.g., we get 'LArHitEMB'
 
    if(sg->retrieve(lar_collection, collName)==StatusCode::SUCCESS)
        {
            for (auto hi : *lar_collection ) {
 
                const LArHit* larHit = hi;
                const CaloDetDescrElement* ddElement = m_clockwork->lar_dd_man->get_element(larHit->cellID());
                if (ddElement) 
                    handleDetDescrElementHit(ddElement, hitVtxProperty, hitCount);
                else
                    message("Unable to retrieve the CaloDetDescrElement!");
            }
        }
        else
            message("Unable to retrieve " + QString::fromStdString(collName) );
  }
  else if(detector=="Tile")
  {
      //
      // Tile:
      //
      // For more Tile simHits data, see:
      // Simulation/Tools/HitAnalysis/src/CaloHitAnalysis.cxx
      //
      const TileHitVector* t_collection = nullptr;
 
      if(sg->retrieve(t_collection,"TileHitVec")==StatusCode::SUCCESS)
      {
          for (const TileHit& hit : *t_collection) {
              Identifier pmt_id = hit.identify();
              Identifier cell_id = m_clockwork->tile_id->cell_id(pmt_id);
              const CaloDetDescrElement* ddElement = (m_clockwork->tile_id->is_tile_aux(cell_id)) ? 0 : m_clockwork->tile_dd_man->get_cell_element(cell_id);
              if (ddElement) 
                  handleDetDescrElementHit(ddElement, hitVtxProperty, hitCount);
              else
                  message("Unable to retrieve the CaloDetDescrElement!");
          }
      }
      else
          message("Unable to retrieve Tile Hits");
  }
  else if(detector=="MDT")
  {
    //
    // MDT:
    //
    const MDTSimHitCollection* mdt_collection = nullptr;
    if(sg->retrieve(mdt_collection)==StatusCode::SUCCESS)
    {
      for (const MDTSimHit& hit : *mdt_collection)
      {
        GeoMDTHit ghit(hit);
        if(!ghit) continue;
        Amg::Vector3D u = ghit.getGlobalPosition();
        hitVtxProperty->vertex.set1Value(hitCount++,u.x(),u.y(),u.z());
      }
    }
    else
      message("Unable to retrieve MDT Hits");
  }
  else if(detector=="RPC")
  {
    //
    // RPC:
    //
    const RPCSimHitCollection* rpc_collection = nullptr;
    if(sg->retrieve(rpc_collection)==StatusCode::SUCCESS) {
      for (const RPCSimHit& hit : *rpc_collection)
      {
        GeoRPCHit ghit(hit);
        if(!ghit) continue;
        Amg::Vector3D u = ghit.getGlobalPosition();
        hitVtxProperty->vertex.set1Value(hitCount++,u.x(),u.y(),u.z());
      }
    }
    else
      message("Unable to retrieve RPC Hits");
  }
  else if(detector=="TGC")
  {
    //
    // TGC:
    //
    const TGCSimHitCollection* tgc_collection = nullptr;
    if (sg->retrieve(tgc_collection)==StatusCode::SUCCESS)
    {
      for (const TGCSimHit& hit : *tgc_collection)
      {
        GeoTGCHit ghit(hit);
        if(!ghit) continue;
        Amg::Vector3D u = ghit.getGlobalPosition();
        hitVtxProperty->vertex.set1Value(hitCount++,u.x(),u.y(),u.z());
      }
    }
    else
      message("Unable to retrieve TGC Hits");
  }
  else if(detector=="CSC")
  {
    //
    // CSC:
    //
    const CSCSimHitCollection* csc_collection = nullptr;
    if(sg->retrieve(csc_collection)==StatusCode::SUCCESS)
    {
      for (const CSCSimHit& hit : *csc_collection)
      {
        GeoCSCHit ghit(hit);
        if (!ghit) continue;
        Amg::Vector3D u = ghit.getGlobalPosition();
        hitVtxProperty->vertex.set1Value(hitCount++,u.x(),u.y(),u.z());
      }
    }
    else
      message("Unable to retrieve CSC Hits");
  }
  else if(detector=="MM")
  {
    //
    // NSW / MM:
    //
    const MMSimHitCollection* mm_collection;
    if(sg->retrieve(mm_collection)==StatusCode::SUCCESS)
    {
      for( const MMSimHit& hit : *mm_collection )
      {
        GeoMMHit ghit(hit);
        if(!ghit) continue;
        Amg::Vector3D u = ghit.getGlobalPosition();
        hitVtxProperty->vertex.set1Value(hitCount++,u.x(),u.y(),u.z());
      }
    }
    else
      message("Unable to retrieve MM Hits");
  }
  else if(detector=="sTGC")
  {
    //
    // NSW / sTGC:
    //
    const sTGCSimHitCollection* stgc_collection;
    if(sg->retrieve(stgc_collection)==StatusCode::SUCCESS)
    {
      for( const sTGCSimHit& hit : *stgc_collection )
      {
        GeosTGCHit ghit(hit);
        if(!ghit) continue;
        Amg::Vector3D u = ghit.getGlobalPosition();
        hitVtxProperty->vertex.set1Value(hitCount++,u.x(),u.y(),u.z());
      }
    }
    else
      message("Unable to retrieve sTGC Hits");
  }
  else if(detector=="Generic Muon")
    {
      //
      // Generic:
      //
      message("Trying for Generic Muon (as many collections as can be found)");
      for(const QString& key : VP1SGContentsHelper(this).getKeys<GenericMuonSimHitCollection>()) {
        const GenericMuonSimHitCollection* generic_collection = nullptr;
        if(sg->retrieve( generic_collection,key.toStdString().c_str() )==StatusCode::SUCCESS)
        {
          messageVerbose("Retrieved"+key+"with size: "+str(generic_collection->size()));
          std::cout<<"Got collection with size: "<<generic_collection->size()<<std::endl;
 
          //unsigned int i=0; // for DEBUG only
          for (const GenericMuonSimHit& hit : *generic_collection)
          {
            // std::cout << "Got hit number: " << i++ << std::endl; // for DEBUG only
            const GenericMuonSimHit ghit(hit);
            const Amg::Vector3D& u = ghit.globalPosition();
            hitVtxProperty->vertex.set1Value(hitCount++,u.x(),u.y(),u.z());
          }
        }
        else
          message("Unable to retrieve Generic Muon Hits from "+key);
        }
  } else if(detector=="Forward Region")
    {
      //
      // Generic:
      //
      message("Trying for ForwardRegion (as many collections as can be found)");
      for(const QString& key : VP1SGContentsHelper(this).getKeys<SimulationHitCollection>()) {
        const SimulationHitCollection* generic_collection = nullptr;
        if(sg->retrieve( generic_collection,key.toStdString().c_str() )==StatusCode::SUCCESS)
        {
          messageVerbose("Retrieved"+key+"with size: "+str(generic_collection->size()));
          std::cout<<"Got collection with size: "<<generic_collection->size()<<std::endl;
 
          //unsigned int i=0; // for DEBUG only
          for (const SimulationHit& hit : *generic_collection)
          {
            // std::cout << "Got hit number: " << i++ << std::endl; // for DEBUG only
            const SimulationHit ghit(hit);
            const Amg::Vector3D& u = Amg::Hep3VectorToEigen(ghit.pre().position);
            hitVtxProperty->vertex.set1Value(hitCount++,u.x(),u.y(),u.z());
          }
        }
        else
          message("Unable to retrieve Simulation Hits from "+key);
        }
  } else {
      VP1Msg::messageWarningRed("WARNING! Retrieval of Sim Hits not defined for the detector: " + detector, this);
  }
 
  // Add to the switch
  hitPointSet->numPoints=hitCount;
  hitPointSet->vertexProperty.setValue(hitVtxProperty);
  sw->addChild(hitPointSet);
  hitPointSet->enableNotify(TRUE);
  hitVtxProperty->enableNotify(TRUE);
}
 
 
void VP1SimHitSystem::handleDetDescrElementHit(const CaloDetDescrElement *hitElement, SoVertexProperty* hitVtxProperty, unsigned int &hitCount)
{
    float x = hitElement->x();
    float y = hitElement->y();
    double z = hitElement->z();
    hitVtxProperty->vertex.set1Value(hitCount++,x,y,z);
}