TBTrackToCaloAlg.cxx

Go to the documentation of this file.

/*
  Copyright (C) 2002-2025 CERN for the benefit of the ATLAS collaboration
*/

// TBTrackToCaloAlg.cxx
//   Implementation file for class TBTrackToCaloAlg
 
#include "TBTrackToCaloAlg.h"
#include "TBExtrapolTrackToCaloTool.h"
 
// Gaudi includes
#include "GaudiKernel/IToolSvc.h"
 
// Tracking includes
#include "TrkParameters/TrackParameters.h"
//#include "TrkParameters/MeasuredPerigee.h"
//#include "TrkParameters/Perigee.h"
#include <vector>
#include "Particle/TrackParticleContainer.h"
#include "Particle/TrackParticle.h"
 
//#include "TrackToCalo/ImpactInCalo.h"
 
#include "CaloEvent/CaloCluster.h"
#include "CaloEvent/CaloClusterContainer.h"
#include "CaloGeoHelpers/CaloPhiRange.h"
#include "CaloUtils/CaloCellList.h"
#include "CaloEvent/CaloCell.h"
#include "CaloEvent/CaloCellContainer.h"
#include "CaloDetDescr/ICaloCoordinateTool.h"
#include "CaloDetDescr/CaloDepthTool.h"
 
//#include "ITrackToCalo/IExtrapolTrackToCaloTool.h"
//#include "RecoToolInterfaces/IExtrapolateToCaloTool.h"
#include "ImpactInCaloCollection.h"
#include "AthenaKernel/Units.h"
 
using Athena::Units::GeV;
 
 
// Constructor with parameters:
TBTrackToCaloAlg::TBTrackToCaloAlg(const std::string &name, 
                                   ISvcLocator *pSvcLocator) :
  AthAlgorithm(name,pSvcLocator),
  m_TrackName("Tracks"),
  m_tracks(0),
  m_calodepth(nullptr)
{  
  // Get parameter values from jobOptions file
  declareProperty("TrackName", m_TrackName);
  declareProperty("TrackParticleName", m_TrackParticleName);
  declareProperty("ClusterContainerName", m_cluster_container);
  declareProperty("CaloCellContainerName", m_cell_container);
  declareProperty("ImpactInCaloContainerName", m_ImpactInCalosOutputName);
  declareProperty("TrackInputType", m_trkinput);
  m_calo_id = 0;
  m_calo_tb_coord = 0;
  m_particle = 0;
  m_toCalo = 0;
}
 
// Initialize method:
StatusCode TBTrackToCaloAlg::initialize()
{
  ATH_MSG_DEBUG ( "TBTrackToCaloAlg::initialize()" );
 
  ATH_CHECK(detStore()->retrieve(m_calo_id,"CaloCell_ID"));
 
  IAlgTool* algTool = 0;
 
  StatusCode sc = toolSvc()->retrieveTool("ExtrapolTrackToCaloTool", algTool,this);
  //m_toCalo=dynamic_cast<IExtrapolTrackToCaloTool*>(algTool); 
  //m_toCalo=dynamic_cast<IExtrapolateToCaloTool*>(algTool); 
  m_toCalo=dynamic_cast<TBExtrapolTrackToCaloTool*>(algTool); 
  if(sc.isFailure() || !m_toCalo) {
    ATH_MSG_ERROR ( "Cannot get ExtrapolTrackToCaloTool" );
    return StatusCode::FAILURE;
  }
  
  IAlgTool* tool = 0;
  ATH_CHECK( toolSvc()->retrieveTool("TBCaloCoordinate", tool) );
  m_calo_tb_coord = dynamic_cast<ICaloCoordinateTool*>(tool);
 
  // retrieved via the Extrapolator to make sure that jobOpt setting is consistent.
  m_calodepth = m_toCalo->getCaloDepth();
  if (!m_calodepth) {
    ATH_MSG_ERROR ( "Cannot get CaloDepthTool" );
    return StatusCode::FAILURE; 
  }
 
  ATH_MSG_INFO ( "TBTrackToCaloAlg initialisation OK" );
  return StatusCode::SUCCESS;
}
 
// Execute method:
StatusCode TBTrackToCaloAlg::execute() 
{
  ATH_MSG_DEBUG ( "TBTrackToCaloAlg::execute()" );
 
  // just a simple test ( trick to trigger position reading )
  // PrintBeamPosition();
 
  // Create the impacts :
  /*found_a_track =*/ CreateTrkImpactInCalo();
  
  // Example 1 : you want to read them and compare to clusters
 
  /*
    if (found_a_track) {
    PrintImpact();
    //CompareImpactWithCluster();
    } 
  */
 
  // Example 2 : you want to know the list of cells crossed by the track
  // bool found_cells = PrintCellsCrossed();
  ATH_CHECK(m_caloMgrKey.initialize());
  return StatusCode::SUCCESS;
}
 
// Finalize method:
StatusCode TBTrackToCaloAlg::finalize() 
{
  ATH_MSG_DEBUG ( "TBTrackToCaloAlg::finalize()" );
  
  return StatusCode::SUCCESS;
}
 
 
// Loop on Tracks/TrackParticles and create ImpactInCaloCollection
bool TBTrackToCaloAlg::CreateTrkImpactInCalo()
{
  bool got_a_track = false;
  
  ATH_MSG_DEBUG ( "TBTrackToCaloAlg::CreateTrkImpactInCalo()" );
 
  //create and record new ImpactInCalo container
  ImpactInCaloCollection* outputContainer = new ImpactInCaloCollection();
  StatusCode sc=evtStore()->record(outputContainer,m_ImpactInCalosOutputName,false); //"false" indicates it can't be modified by another algorithm
  if(sc != StatusCode::SUCCESS){
    ATH_MSG_ERROR ( " Could not record ImpactInCaloCollection" 
                    << m_ImpactInCalosOutputName );
    return got_a_track ;
  }
 
  m_particle = 0;
  m_tracks = 0;
 
  if( m_trkinput == "TrackParticleCandidates")
    {
      if (m_TrackParticleName == "") {
    ATH_MSG_ERROR ("m_TrackParticleName not set" );
    return true;
      }
 
      sc = evtStore()->retrieve(m_particle, m_TrackParticleName);
 
      if (sc.isFailure()) ATH_MSG_ERROR ("TrackParticle not found: will only play with calo " << m_TrackParticleName );
      else {
    ATH_MSG_DEBUG ("TrackParticle found in StoreGate" );
        for (const Rec::TrackParticle* tp : *m_particle) {
      const Trk::Track* tr = tp->originalTrack();
 
      ImpactInCalo * imp = GetImpactsInCalo(tr, got_a_track);     
      if(imp) outputContainer->push_back(imp);
      else ATH_MSG_DEBUG (" ImpactInCalo pointer not valid for this track");
    }
      }
    }
 
  else
    {
      if (m_TrackName == "") {
    ATH_MSG_ERROR ("m_TrackName not set" );
    return true;
      }
 
      sc = evtStore()->retrieve(m_tracks, m_TrackName);
 
      if (sc.isFailure()) ATH_MSG_ERROR ("Tracks not found: will only play with calo " << m_TrackName );
      else {
    ATH_MSG_DEBUG ("Tracks found in StoreGate" );
        for (const Trk::Track* tr : *m_tracks) {
      ImpactInCalo * imp = GetImpactsInCalo(tr, got_a_track);
      if(imp) outputContainer->push_back(imp);
      else ATH_MSG_DEBUG (" ImpactInCalo pointer not valid for this track");
    }
      }
    }
 
  return  got_a_track;
}
 
ImpactInCalo* TBTrackToCaloAlg::GetImpactsInCalo(const Trk::Track* track, bool& got_a_track)
{
  Amg::Vector3D* pt_calo_ctb = new Amg::Vector3D; 
  Amg::Vector3D* pt_calo_local = new Amg::Vector3D; 
 
  SG::ReadCondHandle<CaloDetDescrManager> caloMgrHandle{m_caloMgrKey};
  const CaloDetDescrManager* caloDDMgr = *caloMgrHandle;
 
  double trketa = 0.;
  // take the last measured point to find out if I am in barrel or endcap :
  const DataVector <const Trk::TrackParameters>* paramvec = track->trackParameters();
  if (paramvec) { 
    for (const Trk::TrackParameters* params : *paramvec)
      trketa = params->eta();
  } 
  else
    ATH_MSG_ERROR ( "  No track parameters for this track ??? do nothing " );
  
  double distbar = 0.;
  double distec = 0.;
  double offset = 0.;   
  double trketa_at = 0.;
  double trkphi_at = 0.;
  bool result = false;
  CaloCell_ID::CaloSample sample;
  
  // PreSampler :
  double x_ctb_0 = 0;
  double y_ctb_0 = 0;
  double z_ctb_0 = 0;
  double etaCaloLocal_0 = 0; 
  double phiCaloLocal_0 = 0;
  double trketa_at_0 = 0.;
  double trkphi_at_0 = 0.;
  // Strip :
  double x_ctb_1 = 0;
  double y_ctb_1 = 0;
  double z_ctb_1 = 0;
  double etaCaloLocal_1 = 0; 
  double phiCaloLocal_1 = 0;
  double trketa_at_1 = 0.;
  double trkphi_at_1 = 0.;
  // Middle :
  double x_ctb_2 = 0;
  double y_ctb_2 = 0;
  double z_ctb_2 = 0;
  double etaCaloLocal_2 = 0; 
  double phiCaloLocal_2 = 0;
  double trketa_at_2 = 0.;
  double trkphi_at_2 = 0.;
  // Back :
  double x_ctb_3 = 0;
  double y_ctb_3 = 0;
  double z_ctb_3 = 0;
  double etaCaloLocal_3 = 0; 
  double phiCaloLocal_3 = 0;
  double trketa_at_3 = 0.;
  double trkphi_at_3 = 0.;
  // Tiles : 
  double x_ctb_tile = 0;
  double y_ctb_tile = 0;
  double z_ctb_tile = 0;
  double etaCaloLocal_tile = 0; 
  double phiCaloLocal_tile = 0;
  double trketa_at_tile = 0.;
  double trkphi_at_tile = 0.;
  
  if (paramvec) { 
    
    // PS :
    distbar = CaloDepthTool::deta(CaloCell_ID::PreSamplerB,trketa,caloDDMgr);
    distec = CaloDepthTool::deta(CaloCell_ID::PreSamplerE,trketa,caloDDMgr);
    
    ATH_MSG_DEBUG ( " TrackTo ...PS : for eta= " << trketa << " dist to Barrel =" << distbar 
                    << " to endcap =" << distec );
    if (distbar < 0 )  sample = CaloCell_ID::PreSamplerB;
    else if (distec < 0 ) sample = CaloCell_ID::PreSamplerE;
    else if ( distbar < distec) sample = CaloCell_ID::PreSamplerB;
    else sample = CaloCell_ID::PreSamplerE;
    ATH_MSG_DEBUG ( "  => will shoot in sample " << sample );
    
    result = m_toCalo->TrackSeenByCalo(track,sample,offset,
                       pt_calo_ctb,pt_calo_local,trketa_at,trkphi_at);
    
    if (result) {
      got_a_track=true;
      x_ctb_0 = pt_calo_ctb->x();
      y_ctb_0 = pt_calo_ctb->y();
      z_ctb_0 = pt_calo_ctb->z();
      etaCaloLocal_0 = pt_calo_local->eta(); 
      phiCaloLocal_0 = pt_calo_local->phi();
      trketa_at_0 = trketa_at;
      trkphi_at_0 = trkphi_at;
      
      ATH_MSG_DEBUG ( "Extrapolation to PreSamplerB gives: " 
      << " etaCaloLocal=" << pt_calo_local->eta()
                      << " phiCaloLocal=" << pt_calo_local->phi() );
    }
    
    // strip :
    distbar = CaloDepthTool::deta(CaloCell_ID::EMB1,trketa,caloDDMgr);
    distec = CaloDepthTool::deta(CaloCell_ID::EME1,trketa,caloDDMgr);
    
    ATH_MSG_DEBUG ( " TrackTo ...Strip : for eta= " << trketa << " dist to Barrel =" << distbar 
                    << " to endcap =" << distec );
    if (distbar < 0 ) sample = CaloCell_ID::EMB1;
    else if (distec < 0 ) sample = CaloCell_ID::EME1;
    else if ( distbar < distec) sample = CaloCell_ID::EMB1;
    else sample = CaloCell_ID::EME1;
    ATH_MSG_DEBUG ( "  => will shoot in sample " << sample );
    
    result = m_toCalo->TrackSeenByCalo(track,sample,offset,
                       pt_calo_ctb,pt_calo_local,trketa_at,trkphi_at);
    
    if (result) {
      got_a_track=true;
      x_ctb_1 = pt_calo_ctb->x();
      y_ctb_1 = pt_calo_ctb->y();
      z_ctb_1 = pt_calo_ctb->z();
      etaCaloLocal_1 = pt_calo_local->eta(); 
      phiCaloLocal_1 = pt_calo_local->phi();
      trketa_at_1 = trketa_at;
      trkphi_at_1 = trkphi_at;
      
      ATH_MSG_DEBUG ( "Extrapolation to EMB1 gives: " 
                      << " etaCaloLocal=" << pt_calo_local->eta()
                      << " phiCaloLocal=" << pt_calo_local->phi() );
    }
    
    
    // middle :
    distbar = CaloDepthTool::deta(CaloCell_ID::EMB2,trketa,caloDDMgr);
    distec = CaloDepthTool::deta(CaloCell_ID::EME2,trketa,caloDDMgr);
    
    ATH_MSG_DEBUG ( " TrackTo ...Middle : for eta= " << trketa << " dist to Barrel =" << distbar 
                    << " to endcap =" << distec );
    if (distbar < 0 ) sample = CaloCell_ID::EMB2;
    else if (distec < 0 ) sample = CaloCell_ID::EME2;
    else if ( distbar < distec) sample = CaloCell_ID::EMB2;
    else sample = CaloCell_ID::EME2;
    ATH_MSG_DEBUG ( "  => will shoot in sample " << sample );
    
    result = m_toCalo->TrackSeenByCalo(track,sample,offset,
                       pt_calo_ctb,pt_calo_local,trketa_at,trkphi_at);
    
    if (result) {
      got_a_track=true;
      x_ctb_2 = pt_calo_ctb->x();
      y_ctb_2 = pt_calo_ctb->y();
      z_ctb_2 = pt_calo_ctb->z();
      etaCaloLocal_2 = pt_calo_local->eta(); 
      phiCaloLocal_2 = pt_calo_local->phi();
      trketa_at_2 = trketa_at;
      trkphi_at_2 = trkphi_at;
      
      ATH_MSG_DEBUG ( "Extrapolation to EMB2 gives: " 
                      << " etaCaloLocal=" << pt_calo_local->eta()
                      << " phiCaloLocal=" << pt_calo_local->phi() );
    }
    
    // Back :
    //
    // there is a real gap between 1.35 (end of EMB3) and 1.5 (start of EMEC3)
    // => for TrackToCalo chooses the closest. One could choose to stay in 
    //    barrel as long as not in endcap
    // In both cases, m_calodepth will see that you are outside the accpetance and
    // will use the backup solution (egparametrisation right now, rel 10.0.2).
    //
    
    distbar = CaloDepthTool::deta(CaloCell_ID::EMB3,trketa,caloDDMgr);
    distec = CaloDepthTool::deta(CaloCell_ID::EME3,trketa,caloDDMgr);
    
    ATH_MSG_DEBUG ( " TrackTo ...Back : for eta= " << trketa << " dist to Barrel =" << distbar 
                    << " to endcap =" << distec );
    if (distbar < 0 ) sample = CaloCell_ID::EMB3;
    else if (distec < 0 ) sample = CaloCell_ID::EME3;
    else if ( distbar < distec) sample = CaloCell_ID::EMB3;
    else sample = CaloCell_ID::EME3;
    ATH_MSG_DEBUG ( "  => will shoot in sample " << sample );
    
    result = m_toCalo->TrackSeenByCalo(track,sample,offset,
                       pt_calo_ctb,pt_calo_local,trketa_at,trkphi_at);
    
    if (result) {
      got_a_track=true;
      x_ctb_3 = pt_calo_ctb->x();
      y_ctb_3 = pt_calo_ctb->y();
      z_ctb_3 = pt_calo_ctb->z();
      etaCaloLocal_3 = pt_calo_local->eta(); 
      phiCaloLocal_3 = pt_calo_local->phi();
      trketa_at_3 = trketa_at;
      trkphi_at_3 = trkphi_at;
      
      ATH_MSG_DEBUG ( "Extrapolation to EMB3 gives: " 
                      << " etaCaloLocal=" << pt_calo_local->eta()
                      << " phiCaloLocal=" << pt_calo_local->phi() );
    }
    
    // Tile or HEC0 :
    distbar = CaloDepthTool::deta(CaloCell_ID::TileBar0,trketa,caloDDMgr);
    distec = CaloDepthTool::deta(CaloCell_ID::HEC0,trketa,caloDDMgr);
    
    ATH_MSG_DEBUG ( " TrackTo ...Tile : for eta= " << trketa << " dist to Barrel =" << distbar 
                    << " to endcap =" << distec );
    if (distbar < 0 ) sample = CaloCell_ID::TileBar0;
    else if (distec < 0 ) sample = CaloCell_ID::HEC0;
    else if ( distbar > distec && distec < 10. ) sample = CaloCell_ID::HEC0;
    else sample = CaloCell_ID::TileBar0;
    ATH_MSG_DEBUG ( "  => will shoot in sample " << sample );
    
    result = m_toCalo->TrackSeenByCalo(track,sample,offset,
                       pt_calo_ctb,pt_calo_local,trketa_at,trkphi_at);
    
    if (result) {
      got_a_track=true;
      x_ctb_tile = pt_calo_ctb->x();
      y_ctb_tile = pt_calo_ctb->y();
      z_ctb_tile = pt_calo_ctb->z();
      etaCaloLocal_tile = pt_calo_local->eta(); 
      phiCaloLocal_tile = pt_calo_local->phi();
      trketa_at_tile = trketa_at;
      trkphi_at_tile = trkphi_at;
      
      ATH_MSG_DEBUG ( "Extrapolation to TileBar0 gives: " 
                      << " etaCaloLocal=" << pt_calo_local->eta()
                      << " phiCaloLocal=" << pt_calo_local->phi() );
    }
  }
  
  ImpactInCalo * imp= new ImpactInCalo(x_ctb_0, y_ctb_0, z_ctb_0, etaCaloLocal_0, phiCaloLocal_0, trketa_at_0, trkphi_at_0,
                       x_ctb_1, y_ctb_1, z_ctb_1, etaCaloLocal_1, phiCaloLocal_1, trketa_at_1, trkphi_at_1,
                       x_ctb_2, y_ctb_2, z_ctb_2, etaCaloLocal_2, phiCaloLocal_2, trketa_at_2, trkphi_at_2,
                       x_ctb_3, y_ctb_3, z_ctb_3, etaCaloLocal_3, phiCaloLocal_3, trketa_at_3, trkphi_at_3,
                       x_ctb_tile, y_ctb_tile, z_ctb_tile, etaCaloLocal_tile, phiCaloLocal_tile, trketa_at_tile, trkphi_at_tile);
  
  if(pt_calo_ctb) delete pt_calo_ctb;
  if(pt_calo_local) delete pt_calo_local;
  
  return imp;
}
 
 
 
 
// Retreive ImpactInCaloCollection and compare to CaloClusters
void TBTrackToCaloAlg::CompareImpactWithCluster()
{
  StatusCode sc1, sc2;
 
  ATH_MSG_DEBUG ( "TBTrackToCaloAlg::CompareImpactWithCluster()" );
 
  // loop on clusters
  
  const CaloClusterContainer* cluster_container = nullptr;
  sc1=evtStore()->retrieve(cluster_container,m_cluster_container);
  
  const ImpactInCaloCollection* impact_collection;
  sc2=evtStore()->retrieve(impact_collection,m_ImpactInCalosOutputName);
  
  if(sc1 == StatusCode::SUCCESS && sc2 == StatusCode::SUCCESS ){
 
    typedef ImpactInCaloCollection::const_iterator impact_iterator;
    impact_iterator f_imp = impact_collection->begin();
    impact_iterator l_imp = impact_collection->end();
 
    for (const CaloCluster* cluster : *cluster_container) {
      double hecluster = cluster->energy()/GeV;
      double heta = cluster->eta();
      double hphi = cluster->phi();
 
      ATH_MSG_INFO ( "Found a cluster : E= " << hecluster 
                     << "(GeV), etaCaloLocal=" <<  heta 
                     << ", phiCaloLocal=" << hphi );
      
      for ( ; f_imp!=l_imp; ++f_imp){ 
    const ImpactInCalo* impact = (*f_imp);
        
    ATH_MSG_INFO 
          ( "==> Comparison between cluster and impact in Middle : deta=" 
        << heta-impact->etaCaloLocal_2()
        << " , dphi=" << hphi-impact->phiCaloLocal_2() );
      }
    }
  }
  else {
    if (sc1 != StatusCode::SUCCESS)
      ATH_MSG_ERROR ("Clusters not found" 
                     << m_cluster_container );
    if (sc2 != StatusCode::SUCCESS)
      ATH_MSG_ERROR ("ImpactInCalos not found" 
                     << m_ImpactInCalosOutputName );
  }
}
 
// Retreive ImpactInCaloCollection and print content
void TBTrackToCaloAlg::PrintImpact()
{
  StatusCode sc;
 
  ATH_MSG_INFO ( " Method PrintImpacts : " );
 
  ATH_MSG_INFO ( " " );
  ATH_MSG_INFO ( " Start with Impacts : " );
  
  const ImpactInCaloCollection* impact_collection;
  sc=evtStore()->retrieve(impact_collection,m_ImpactInCalosOutputName);
  
  if(sc == StatusCode::SUCCESS ){
 
    for (const ImpactInCalo* impact : *impact_collection) {
      const double impcosPhi = std::cos(impact->phiCaloLocal_1());
      const double impeta = impact->etaCaloLocal_1();
 
      ATH_MSG_INFO ( "Found an impact in strips : parameters are eta = " << impeta  
                     << " cosPhi = " << impcosPhi );
 
      //impact->print();
    }
  }
  else {
    ATH_MSG_ERROR ("ImpactInCalos not found" 
                   << m_ImpactInCalosOutputName );
  }
 
  if (m_tracks) {
 
    ATH_MSG_INFO ( " " );
    ATH_MSG_INFO (" Now loop on Trk::Track collection " );
    ATH_MSG_INFO ( " " );
 
    for (const Trk::Track* tr : *m_tracks) {
      const Trk::Perigee *aMeasPer=
    dynamic_cast<const Trk::Perigee*>(tr->perigeeParameters());
      if (aMeasPer==0){
    ATH_MSG_ERROR ( "Could not get Trk::MeasuredPerigee" );
      }
      else {    
 
    const double trkcosPhi = cos(aMeasPer->parameters()[Trk::phi]);
    const double trketa = aMeasPer->eta();
    
    ATH_MSG_INFO ( "Found a Trk::Track : parameters are eta = " << trketa  
                       << " cosPhi = " << trkcosPhi );
      }
    }
  }
 
  if (m_particle) {
    
    ATH_MSG_INFO ( " " );
    ATH_MSG_INFO (" Now loop on Trk::TrackParticle collection " );
    ATH_MSG_INFO ( " " );
    
    for (Rec::TrackParticleContainer::const_iterator itr = m_particle->begin();
     itr != m_particle->end(); ++itr )
      {
    const Trk::Perigee *aMeasPer=
      dynamic_cast<const Trk::Perigee*>(((*itr)->originalTrack())->perigeeParameters());
    if (aMeasPer==0){
      ATH_MSG_ERROR ( "Could not get TrkParticle::MeasuredPerigee" );
    }
    else {  
      
      const double partcosPhi = cos(aMeasPer->parameters()[Trk::phi]);
      const double parteta = aMeasPer->eta();
      
      ATH_MSG_INFO ( "Found a trackparticle : parameters are eta = " << parteta  
                         << " cosPhi = " << partcosPhi );
    }
      }
  }
}
 
// List of cells crossed by Trk::Tracks in CaloSample 
// ( neta and nphi are the total window width, e.g .5x5 )
CaloCellList* 
TBTrackToCaloAlg::CellsCrossedByTrack(const Trk::Track* trk, 
                    const CaloCell_ID::CaloSample sam, 
                    int neta, int nphi)
{
  CaloCellList* my_list = 0;
 
  // Retreive CaloCell's from StoreGate :  
 
  const CaloCellContainer* cell_container;
  StatusCode sc=evtStore()->retrieve(cell_container,m_cell_container);
  if ( sc != StatusCode::SUCCESS  ) return 0;
 
  SG::ReadCondHandle<CaloDetDescrManager> caloMgrHandle{m_caloMgrKey};
  const CaloDetDescrManager* caloDDMgr = *caloMgrHandle;
 
  // Where is the track shooting ?
  double offset = 0.;
  double trketa_at = 0.;
  double trkphi_at = 0.;
  Amg::Vector3D* pt_ctb = new Amg::Vector3D();
  Amg::Vector3D* pt_local = new Amg::Vector3D();
  bool result = m_toCalo->
    TrackSeenByCalo(trk,sam,offset,pt_ctb,pt_local,trketa_at,trkphi_at);
 
  if (!result) {
    delete pt_ctb;
    delete pt_local;
    return 0;
  }
 
  double eta = pt_local->eta();
  double phi = pt_local->phi();
 
  // CaloCellList needs both enums: subCalo and CaloSample
  CaloCell_ID::SUBCALO subcalo;
  bool barrel;
  int sampling_or_module;
  CaloDetDescrManager::decode_sample (subcalo, barrel, sampling_or_module, sam);
 
  // Get the corresponding grannularities : needs to know where you are 
  //                  the easiest is to look for the CaloDetDescrElement
  const CaloDetDescrElement* dde =
     caloDDMgr->get_element(subcalo,sampling_or_module,barrel,eta,phi);
 
  double deta = int(neta/2)*dde->deta();
  double dphi = int(nphi/2)*dde->dphi();
  
  //std::cout << "zone is ..." << eta << " " << phi << " "
  //          << deta << " " << dphi << " " << std::endl;
  // Construct the list : 
  my_list = new CaloCellList(caloDDMgr, cell_container,subcalo);
  my_list->select(eta,phi,deta,dphi, (int) sam);
 
  // cleanup 
  delete pt_ctb;
  delete pt_local;
  
  return my_list ;
}
 
bool TBTrackToCaloAlg::PrintCellsCrossed()
{
 
  // Get the messaging service, print where you are
  ATH_MSG_INFO ( "TBTrackToCaloAlg::PrintCellsCrossed()" );
  
  // Here we are :
  CaloCell_ID::CaloSample sam = CaloCell_ID::EMB2;
  int neta = 5;
  int nphi = 5;
  
  // get tracks from TDS
  if (m_TrackName == "") {
    ATH_MSG_ERROR ("m_TrackName not set" );
    return true;
  }
 
  StatusCode sc = evtStore()->retrieve(m_tracks, m_TrackName);
  if (sc.isFailure()){
    ATH_MSG_ERROR ("Tracks not found: will only play with calo " 
                   << m_TrackName );
  }
  else{ 
    ATH_MSG_DEBUG ("Tracks found in StoreGate" );
 
    for (const Trk::Track* tr : *m_tracks) {
      
      const Trk::Perigee *aMeasPer=
    dynamic_cast<const Trk::Perigee*>(tr->perigeeParameters());
      if (aMeasPer==0){
    ATH_MSG_ERROR ( "Could not get Trk::MeasuredPerigee" );
      }
      else {
    double d0 = aMeasPer->parameters()[Trk::d0];
    double z0 = aMeasPer->parameters()[Trk::z0];
    double phi0 = aMeasPer->parameters()[Trk::phi0];
    double theta = aMeasPer->parameters()[Trk::theta];
    double qOverP = aMeasPer->parameters()[Trk::qOverP];
    ATH_MSG_INFO ( " " );
    ATH_MSG_INFO ( "Found a track: parameters are " << d0  << " " 
                       << z0  << " " << phi0 << " " << theta << " " << qOverP );
      }
 
      // Warning : if anything fails, CellsCrossedByTrack will
      //           simply return a null pointer
      //           if it works, it does a new CaloCellList
      //           ==> the client has to do the delete !!!!
 
      CaloCellList* my_list = CellsCrossedByTrack(tr, sam, neta, nphi); 
 
      if (my_list) {
 
        for (const CaloCell* cell : *my_list)
      ATH_MSG_INFO ( "found cell ! eta=" << cell->eta() 
                         << " phi=" << cell->phi() << " energy=" << cell->energy() );
    
    delete my_list;
 
    }
      else 
    ATH_MSG_ERROR (" :-(  extrapolation did not work");
    }
  }
  
  return true;
}
 
// A little check : where is the beam ?
void TBTrackToCaloAlg::PrintBeamPosition()
{
  // Get the messaging service, print where you are
  ATH_MSG_INFO ( "TBTrackToCaloAlg::PrintBeamPosition()" );
 
  ATH_MSG_INFO ( "Just a check... beam direction in calo : " );
  m_calo_tb_coord->read_table_position();  
  Amg::Vector3D beam (1.,0.,0.);
  beam = ( *(m_calo_tb_coord->transform_ctb_to_calo()) )* beam;
}