MuonTrackTruthTool.cxx

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/*
  Copyright (C) 2002-2025 CERN for the benefit of the ATLAS collaboration
*/
 
#include "MuonTruthAlgs/MuonTrackTruthTool.h"
 
#include <iostream>
 
#include "AtlasHepMC/GenEvent.h"
#include "AtlasHepMC/GenParticle.h"
#include "MuonCompetingRIOsOnTrack/CompetingMuonClustersOnTrack.h"
#include "MuonRIO_OnTrack/MdtDriftCircleOnTrack.h"
#include "MuonReadoutGeometry/MuonDetectorManager.h"
#include "MuonSegment/MuonSegment.h"
#include "MuonSimData/MuonSimData.h"
#include "TrkEventUtils/RoT_Extractor.h"
#include "TrkMeasurementBase/MeasurementBase.h"
#include "TrkPseudoMeasurementOnTrack/PseudoMeasurementOnTrack.h"
#include "TrkTrack/Track.h"
#include "TrkTruthData/TruthTrajectory.h"
#include "TruthUtils/HepMCHelpers.h"
 
namespace Muon {
    using namespace MuonStationIndex;
    StatusCode MuonTrackTruthTool::initialize() {
        ATH_CHECK(m_idHelperSvc.retrieve());
        ATH_CHECK(m_printer.retrieve());
        ATH_CHECK(m_truthTrajectoryBuilder.retrieve());
 
        // add muons
        if (m_pdgsToBeConsidered.value().empty()) {
            m_selectedPdgs.insert(13);
            m_selectedPdgs.insert(-13);
        } else {
            // add pdgs
            for (auto pdg : m_pdgsToBeConsidered.value()) { m_selectedPdgs.insert(pdg); }
            ATH_MSG_DEBUG(" PDG codes used for matching "<<m_selectedPdgs);
        }
        return StatusCode::SUCCESS;
    }
 
    int MuonTrackTruthTool::manipulateBarCode(int barcode) const { // FIXME This is obsolete now
        if (m_manipulateBarCode) return barcode % 10000;
        return barcode;
    }
 
    bool MuonTrackTruthTool::SortResultByMatchedHits::operator()(const MuonTrackTruthTool::MatchResult& r1,
                                                                 const MuonTrackTruthTool::MatchResult& r2) const {
        return operator()(r1.second, r2.second);
    }
 
    bool MuonTrackTruthTool::SortResultByMatchedHits::operator()(const MuonTrackTruthTool::SegmentMatchResult& r1,
                                                                 const MuonTrackTruthTool::SegmentMatchResult& r2) const {
        return operator()(r1.second, r2.second);
    }
 
    bool MuonTrackTruthTool::SortResultByMatchedHits::operator()(const MuonTrackTruth& t1, const MuonTrackTruth& t2) const {
        // if not from same track sort by address (should be unique)
        if (t1.truthTrack && !t2.truthTrack) return true;
        if (!t1.truthTrack && t2.truthTrack) return false;
        if (!t1.truthTrack && !t2.truthTrack) return false;
        if (HepMC::uniqueID(t1.truthTrack) == HepMC::uniqueID(t2.truthTrack)) return t1.numberOfMatchedHits() > t2.numberOfMatchedHits();
        return HepMC::uniqueID(t1.truthTrack) < HepMC::uniqueID(t2.truthTrack);
    }
 
    MuonTrackTruthTool::ResultVec MuonTrackTruthTool::match(const TruthTree& truth_tree, const TrackCollection& tracks) const {
        ResultVec result;
        result.reserve(tracks.size());
 
        // loop over tracks and match each of them with truth
        TrackCollection::const_iterator tit = tracks.begin();
        TrackCollection::const_iterator tit_end = tracks.end();
        for (; tit != tit_end; ++tit) {
            MuonTrackTruth match = getTruth(truth_tree, **tit);
            if (!match.truthTrack) continue;
 
            if (match.numberOfMatchedHits() == 0) continue;
 
            // create truth association
            result.emplace_back(*tit, match);
        }
 
        // sort result per muon and per number of matched hits
        std::stable_sort(result.begin(), result.end(), SortResultByMatchedHits());
 
        return result;
    }
 
    MuonTrackTruthTool::SegmentResultVec MuonTrackTruthTool::match(const TruthTree& truth_tree,
                                                                   const std::vector<const MuonSegment*>& segments) const {
        SegmentResultVec result;
        result.reserve(segments.size());
 
        // loop over tracks and match each of them with truth
        std::vector<const MuonSegment*>::const_iterator sit = segments.begin();
        std::vector<const MuonSegment*>::const_iterator sit_end = segments.end();
        for (; sit != sit_end; ++sit) {
            // create truth association
            result.emplace_back(*sit, getTruth(truth_tree, **sit));
        }
 
        // sort result per muon and per number of matched hits
        std::stable_sort(result.begin(), result.end(), SortResultByMatchedHits());
 
        return result;
    }
 
    const MuonTrackTruthTool::TruthTree MuonTrackTruthTool::createTruthTree(const TrackRecordCollection* truthTrackCol,
                                                                            const McEventCollection* mcEventCollection,
                                                                            const std::vector<const MuonSimDataCollection*>& muonSimData,
                                                                            const CscSimDataCollection* cscSimDataMap) const {
        std::map<int, int> barcode_map;
        MuonTrackTruthTool::TruthTree truth_tree;
        if (truthTrackCol->empty()) {
            ATH_MSG_WARNING(" TrackRecordCollection is empty ");
            return truth_tree;
        }
 
        const HepMC::GenEvent* genEvent = nullptr;
        if (!mcEventCollection->empty()) {
            ATH_MSG_VERBOSE("McEventCollection size " << mcEventCollection->size());
            if (mcEventCollection->size() == 1) genEvent = mcEventCollection->front();
        }
 
        ATH_MSG_VERBOSE(" creating truth tree from track record " << truthTrackCol->size());
 
        TrackRecordConstIterator tr_it = truthTrackCol->begin();
        TrackRecordConstIterator tr_it_end = truthTrackCol->end();
        for (; tr_it != tr_it_end; ++tr_it) {
            int PDGCode((*tr_it).GetPDGCode());
            int barcode = HepMC::uniqueID(*tr_it);
            if (!m_matchAllParticles && !selectPdg(PDGCode)) {
                ATH_MSG_VERBOSE(" discarding truth track: pdg " << PDGCode << "  barcode " << barcode);
                continue;
            }
 
            // check whether barcode is already in, skip if that is the case
            if (barcode_map.count(barcode)) {
                ATH_MSG_VERBOSE(" barcode " << barcode << " already in map, final state barcode " << barcode_map[barcode]);
                continue;
            }
            ATH_MSG_VERBOSE(" found new particle with pdgid " << PDGCode << " in truth record, barcode " << barcode);
 
            std::unique_ptr<TruthTrajectory> truthTrajectory;
            // associate the muon truth with the gen event info
            if (genEvent) {
                HepMC::ConstGenParticlePtr genParticle =
#ifdef HEPMC3
                  (barcode>HepMC::UNDEFINED_ID) ? genEvent->particles().at(barcode-1) : nullptr; // FIXME implement HepMC::id_to_particle/vertex explicitly
#else
                 genEvent->barcode_to_particle(HepMC::uniqueID(*tr_it));
#endif
                if (genParticle) {
                    truthTrajectory = std::make_unique<TruthTrajectory>();
                    m_truthTrajectoryBuilder->buildTruthTrajectory(truthTrajectory.get(), genParticle);
                    if (!truthTrajectory->empty()) {
                        // always use barcode of the 'final' particle in chain in map
                        barcode = HepMC::uniqueID(truthTrajectory->front());
 
                        if (msgLvl(MSG::VERBOSE)) {
                            auto particle = truthTrajectory->front().cptr();
                            ATH_MSG_VERBOSE(" found GenParticle: size " << truthTrajectory->size() << " fs barcode " << barcode << "particle "<< particle);
                            if (particle->production_vertex()) {
                                ATH_MSG_VERBOSE(" vertex: r  " << particle->production_vertex()->position().perp() << " z "
                                                               << particle->production_vertex()->position().z());
                            }
                        }
 
                        // now collect all barcodes beloning to this TruthTrajectory
                        std::vector<HepMcParticleLink>::const_iterator pit = truthTrajectory->begin();
                        std::vector<HepMcParticleLink>::const_iterator pit_end = truthTrajectory->end();
                        for (; pit != pit_end; ++pit) {
                            int code = HepMC::uniqueID(*pit);
 
                            if (msgLvl(MSG::VERBOSE) && code != barcode) {
                                auto particle = (*pit).cptr();
                                ATH_MSG_VERBOSE("  secondary barcode: " << code << "particle "<< particle);
                                if (particle->production_vertex())
                                    ATH_MSG_VERBOSE(" vertex: r  " <<particle->production_vertex()->position().perp() << " z "
                                                                   << particle->production_vertex()->position().z());
                                // sanity check
                                if (barcode_map.count(code)) ATH_MSG_VERBOSE("  pre-existing barcode " << code);
                            }
 
                            // enter barcode
                            barcode_map[code] = barcode;
                        }
                    } else {
                        ATH_MSG_WARNING(" empty truth trajectory " << barcode);
                    }
                }
            } else {
                // add one to one relation
                barcode_map[barcode] = barcode;
            }
 
            if (truth_tree.count(barcode)) {
                ATH_MSG_WARNING(" found muon barcode twice in truth record: " << barcode);
                continue;
            }
 
            TruthTreeEntry& entry = truth_tree[barcode];
            entry.truthTrack = &(*tr_it);
            // entry.truthTrajectory = truthTrajectory.get();
            entry.truthTrajectory = std::move(truthTrajectory);
            // m_truthTrajectoriesToBeDeleted.push_back(std::move(truthTrajectory));
        }
 
        // add sim data collections
        for (const MuonSimDataCollection* simDataMap : muonSimData) { addSimDataToTree(truth_tree, barcode_map, simDataMap); }
        if (cscSimDataMap) { addCscSimDataToTree(truth_tree, barcode_map, cscSimDataMap); }
 
        unsigned int ngood(0);
        std::vector<int> badBarcodes;
        // erase entries with too few hits or no track record
        TruthTreeIt it = truth_tree.begin();
        for (; it != truth_tree.end(); ++it) {
            bool erase = false;
            unsigned int nhits = it->second.mdtHits.size() + it->second.rpcHits.size() + it->second.tgcHits.size() +
                                 it->second.cscHits.size() + it->second.stgcHits.size() + it->second.mmHits.size();
            if (!it->second.truthTrack) erase = true;
            if (nhits < m_minHits) erase = true;
 
            if (erase) {
                ATH_MSG_VERBOSE(" Erasing entry: barcode " << HepMC::uniqueID(it->second.truthTrack) << " hits " << nhits);
                badBarcodes.push_back(it->first);
            } else {
                ++ngood;
                ATH_MSG_VERBOSE(" Keeping entry: barcode " << HepMC::uniqueID(it->second.truthTrack) << " hits " << nhits);
            }
        }
 
        std::vector<int>::iterator badIt = badBarcodes.begin();
        std::vector<int>::iterator badIt_end = badBarcodes.end();
        for (; badIt != badIt_end; ++badIt) truth_tree.erase(*badIt);
 
        if (ngood != truth_tree.size()) {
            ATH_MSG_WARNING(" Problem cleaning map: size " << truth_tree.size() << " accepted entries " << ngood);
        }
 
        if (m_doSummary || msgLvl(MSG::DEBUG)) {
            ATH_MSG_INFO(" summarizing truth tree: number of particles " << truth_tree.size());
            TruthTreeIt it = truth_tree.begin();
            TruthTreeIt it_end = truth_tree.end();
            for (; it != it_end; ++it) {
                if (!it->second.truthTrack)
                    ATH_MSG_INFO(" no TrackRecord ");
                else {
                    ATH_MSG_INFO(" PDG " << it->second.truthTrack->GetPDGCode() << " barcode " << HepMC::uniqueID(it->second.truthTrack));
                }
                if (!it->second.mdtHits.empty()) ATH_MSG_INFO(" mdt  " << it->second.mdtHits.size());
                if (!it->second.rpcHits.empty()) ATH_MSG_INFO(" rpc  " << it->second.rpcHits.size());
                if (!it->second.tgcHits.empty()) ATH_MSG_INFO(" tgc  " << it->second.tgcHits.size());
                if (!it->second.cscHits.empty()) ATH_MSG_INFO(" csc  " << it->second.cscHits.size());
                if (!it->second.stgcHits.empty()) ATH_MSG_INFO(" stgc " << it->second.stgcHits.size());
                if (!it->second.mmHits.empty()) ATH_MSG_INFO(" mm   " << it->second.mmHits.size());
                if (it->second.mdtHits.empty() && it->second.rpcHits.empty() && it->second.tgcHits.empty() && it->second.cscHits.empty() &&
                    it->second.stgcHits.empty() && it->second.mmHits.empty())
                    ATH_MSG_INFO(" no hits ");
            }
        }
 
        return truth_tree;
    }
 
    void MuonTrackTruthTool::addSimDataToTree(TruthTree& truth_tree, std::map<int, int>& barcode_map,
                                              const MuonSimDataCollection* simDataCol) const {
        // loop over sim collection and check whether identifiers are on track
        MuonSimDataCollection::const_iterator it = simDataCol->begin();
        MuonSimDataCollection::const_iterator it_end = simDataCol->end();
        for (; it != it_end; ++it) {
            Identifier id = it->first;
 
            // loop over deposits
            std::vector<MuonSimData::Deposit>::const_iterator dit = it->second.getdeposits().begin();
            std::vector<MuonSimData::Deposit>::const_iterator dit_end = it->second.getdeposits().end();
            for (; dit != dit_end; ++dit) {
                int barcodeIn = HepMC::uniqueID(dit->first);
                std::map<int, int>::const_iterator bit = barcode_map.find(barcodeIn);
                if (bit == barcode_map.end()) {
                    ATH_MSG_VERBOSE(" discarding "
                                    << "  " << m_idHelperSvc->toString(id) << "   barcode " << barcodeIn);
                    continue;
                }
                // replace barcode with barcode from map
                int barcode = bit->second;
 
                TruthTreeIt eit = truth_tree.find(barcode);
                if (eit == truth_tree.end()) {
                    ATH_MSG_VERBOSE(" discarding "
                                    << "  " << m_idHelperSvc->toString(id) << "   barcode " << barcode);
                    continue;
                }
 
                if (m_idHelperSvc->isMdt(id)) {
                    eit->second.mdtHits.insert(*it);
                } else if (m_idHelperSvc->isRpc(id)) {
                    if (m_idHelperSvc->stationIndex(id) == StIndex::BO && m_idHelperSvc->rpcIdHelper().doubletR(id) == 2) {
                        ATH_MSG_VERBOSE(" Discarding non existing RPC hit " << m_idHelperSvc->toString(id));
                        continue;
                    }
 
                    eit->second.rpcHits.insert(*it);
                } else if (m_idHelperSvc->isTgc(id)) {
                    eit->second.tgcHits.insert(*it);
                } else if (m_idHelperSvc->issTgc(id)) {
                    eit->second.stgcHits.insert(*it);
                } else if (m_idHelperSvc->isMM(id)) {
                    eit->second.mmHits.insert(*it);
                }
                if (msgLvl(MSG::VERBOSE)) {
                    ATH_MSG_VERBOSE(" adding hit " << m_idHelperSvc->toString(id) << "   barcode " << barcode);
                    if (barcode != barcodeIn) ATH_MSG_VERBOSE(" hit barcode " << barcodeIn);
                }
            }
        }
    }
 
    void MuonTrackTruthTool::addCscSimDataToTree(TruthTree& truth_tree, std::map<int, int>& barcode_map,
                                                 const CscSimDataCollection* simDataCol) const {
        // loop over sim collection and check whether identifiers are on track
        CscSimDataCollection::const_iterator it = simDataCol->begin();
        CscSimDataCollection::const_iterator it_end = simDataCol->end();
        for (; it != it_end; ++it) {
            Identifier id = it->first;
 
            // loop over deposits
            std::vector<CscSimData::Deposit>::const_iterator dit = it->second.getdeposits().begin();
            std::vector<CscSimData::Deposit>::const_iterator dit_end = it->second.getdeposits().end();
            for (; dit != dit_end; ++dit) {
                int barcodeIn = HepMC::uniqueID(dit->first);
                std::map<int, int>::const_iterator bit = barcode_map.find(barcodeIn);
                if (bit == barcode_map.end()) {
                    ATH_MSG_VERBOSE(" discarding "
                                    << "  " << m_idHelperSvc->toString(id) << "   barcode " << barcodeIn);
                    continue;
                }
                // replace barcode with barcode from map
                int barcode = bit->second;
 
                TruthTreeIt eit = truth_tree.find(barcode);
                if (eit == truth_tree.end()) {
                    ATH_MSG_VERBOSE(" discarding "
                                    << "  " << m_idHelperSvc->toString(id) << "   barcode " << barcode);
                    continue;
                }
 
                if (msgLvl(MSG::VERBOSE)) {
                    ATH_MSG_VERBOSE(" adding hit " << m_idHelperSvc->toString(id) << "   barcode " << barcode);
                    if (barcode != barcodeIn) ATH_MSG_VERBOSE(" hit barcode " << barcodeIn);
                }
                eit->second.cscHits.insert(*it);
            }
        }
    }
 
    MuonTrackTruth MuonTrackTruthTool::getTruth(const TruthTree& truth_tree, const Muon::MuonSegment& segment) const {
        return getTruth(truth_tree, segment.containedMeasurements(), true);
    }
 
    MuonTrackTruth MuonTrackTruthTool::getTruth(const TruthTree& truth_tree, const Trk::Track& track, bool restrictedTruth) const {
        if (track.measurementsOnTrack()) return getTruth(truth_tree, track.measurementsOnTrack()->stdcont(), restrictedTruth);
        return {};
    }
 
    MuonTrackTruth MuonTrackTruthTool::getTruth(const TruthTree& truth_tree, const std::vector<const MuonSegment*>& segments,
                                                bool restrictedTruth) const {
        std::set<Identifier> ids;
        std::vector<const Trk::MeasurementBase*> measurements;
        std::vector<const MuonSegment*>::const_iterator sit = segments.begin();
        std::vector<const MuonSegment*>::const_iterator sit_end = segments.end();
        for (; sit != sit_end; ++sit) {
            std::vector<const Trk::MeasurementBase*>::const_iterator mit = (*sit)->containedMeasurements().begin();
            std::vector<const Trk::MeasurementBase*>::const_iterator mit_end = (*sit)->containedMeasurements().end();
            for (; mit != mit_end; ++mit) {
                const Trk::MeasurementBase* meas = *mit;
                const Trk::RIO_OnTrack* rot = nullptr;
                Trk::RoT_Extractor::extract(rot, meas);
                if (!rot) {
                    if (!dynamic_cast<const Trk::PseudoMeasurementOnTrack*>(meas)) ATH_MSG_WARNING(" Could not get rot from measurement ");
                    continue;
                }
                Identifier id = rot->identify();
                if (!id.is_valid() || !m_idHelperSvc->mdtIdHelper().is_muon(id)) continue;
                if (ids.count(id)) continue;
                measurements.push_back(meas);
                ids.insert(id);
            }
        }
        return getTruth(truth_tree, measurements, restrictedTruth);
    }
 
    MuonTrackTruth MuonTrackTruthTool::getTruth(const TruthTree& truth_tree, const std::vector<const Trk::MeasurementBase*>& measurements,
                                                bool restrictedTruth) const {
        MuonTrackTruth bestMatch;
        bestMatch.truthTrack = nullptr;
        bestMatch.truthTrajectory = nullptr;
 
        unsigned int nmatchedHitsBest = 0;
        // loop over muons and match hits
        TruthTreeConstIt tit = truth_tree.begin();
        TruthTreeConstIt tit_end = truth_tree.end();
        for (; tit != tit_end; ++tit) {
            unsigned int nhits = tit->second.mdtHits.size() + tit->second.cscHits.size() + tit->second.rpcHits.size() +
                                 tit->second.tgcHits.size() + tit->second.stgcHits.size() + tit->second.mmHits.size();
            if (nhits == 0) continue;
 
            MuonTrackTruth trackTruth = getTruth(measurements, tit->second, restrictedTruth);
            unsigned int nmatchedHits = trackTruth.numberOfMatchedHits();
            ATH_MSG_DEBUG(" performed truth match for particle with barcode: " << tit->first << " overlap " << nmatchedHits << " fraction  "
                                                                               << (double)nmatchedHits / (double)nhits);
            if (nmatchedHits > 0 && nmatchedHits > nmatchedHitsBest) {
                bestMatch = trackTruth;
                nmatchedHitsBest = nmatchedHits;
            }
        }
 
        return bestMatch;
    }
 
    MuonTrackTruth MuonTrackTruthTool::getTruth(const std::vector<const Trk::MeasurementBase*>& measurements,
                                                const TruthTreeEntry& truthEntry, bool restrictedTruth) const {
        MuonTrackTruth trackTruth;
        trackTruth.truthTrack = truthEntry.truthTrack;
        trackTruth.truthTrajectory = truthEntry.truthTrajectory;
 
        std::vector<const Trk::MeasurementBase*>::const_iterator mit = measurements.begin();
        std::vector<const Trk::MeasurementBase*>::const_iterator mit_end = measurements.end();
        for (; mit != mit_end; ++mit) {
            // check whether state is a measurement
            const Trk::MeasurementBase* meas = *mit;
            if (!meas) { continue; }
 
            const Trk::RIO_OnTrack* rot = nullptr;
            Trk::RoT_Extractor::extract(rot, meas);
            if (!rot) {
                if (!dynamic_cast<const Trk::PseudoMeasurementOnTrack*>(meas)) ATH_MSG_WARNING(" Could not get rot from measurement ");
                continue;
            }
            Identifier id = rot->identify();
            if (!id.is_valid() || !m_idHelperSvc->mdtIdHelper().is_muon(id)) continue;
 
            if (m_idHelperSvc->isMdt(id)) {
                addMdtTruth(trackTruth.mdts, id, *meas, truthEntry.mdtHits);
            } else if (m_idHelperSvc->isCsc(id)) {
                addClusterTruth(trackTruth.cscs, id, *meas, truthEntry.cscHits);
            } else if (m_idHelperSvc->isRpc(id)) {
                addClusterTruth(trackTruth.rpcs, id, *meas, truthEntry.rpcHits);
            } else if (m_idHelperSvc->isTgc(id)) {
                addClusterTruth(trackTruth.tgcs, id, *meas, truthEntry.tgcHits);
            } else if (m_idHelperSvc->issTgc(id)) {
                addClusterTruth(trackTruth.stgcs, id, *meas, truthEntry.stgcHits);
            } else if (m_idHelperSvc->isMM(id)) {
                addClusterTruth(trackTruth.mms, id, *meas, truthEntry.mmHits);
            }
        }
 
        addMissedHits(trackTruth.mdts, trackTruth.mdts.matchedHits, trackTruth.mdts.matchedChambers, truthEntry.mdtHits, restrictedTruth);
        addMissedHits(trackTruth.cscs, trackTruth.cscs.matchedHits, trackTruth.cscs.matchedChambers, truthEntry.cscHits, restrictedTruth);
        addMissedHits(trackTruth.rpcs, trackTruth.rpcs.matchedHits, trackTruth.rpcs.matchedChambers, truthEntry.rpcHits, restrictedTruth);
        addMissedHits(trackTruth.tgcs, trackTruth.tgcs.matchedHits, trackTruth.tgcs.matchedChambers, truthEntry.tgcHits, restrictedTruth);
        addMissedHits(trackTruth.stgcs, trackTruth.stgcs.matchedHits, trackTruth.stgcs.matchedChambers, truthEntry.stgcHits,
                      restrictedTruth);
        addMissedHits(trackTruth.mms, trackTruth.mms.matchedHits, trackTruth.mms.matchedChambers, truthEntry.mmHits, restrictedTruth);
 
        return trackTruth;
    }
 
    void MuonTrackTruthTool::addMissedHits(MuonTechnologyTruth& truth, const std::set<Identifier>& ids, const std::set<Identifier>& chids,
                                           const MuonSimDataCollection& simCol, bool restrictedTruth) const {
        // loop over sim collection and check whether identifiers are on track
        MuonSimDataCollection::const_iterator it = simCol.begin();
        MuonSimDataCollection::const_iterator it_end = simCol.end();
        for (; it != it_end; ++it) {
            Identifier id = it->first;
            // for trigger chambers use layer id
            if (m_idHelperSvc->isTrigger(id) || m_idHelperSvc->isCsc(id)) id = m_idHelperSvc->layerId(id);
 
            int isOnTrack = ids.count(id);
            if (isOnTrack) continue;
 
            // if restricted truth mode, skip if chamber has not hits
            Identifier chid = m_idHelperSvc->chamberId(id);
            bool chamberHasHits = chids.count(chid);
            if (restrictedTruth && !chamberHasHits) continue;
 
            // loop over deposits
            std::vector<MuonSimData::Deposit>::const_iterator dit = it->second.getdeposits().begin();
            std::vector<MuonSimData::Deposit>::const_iterator dit_end = it->second.getdeposits().end();
            for (; dit != dit_end; ++dit) {
                truth.missedHits.insert(id);
                // only fill a missed chamber if the chamber had no hits
                if (!chamberHasHits) truth.missedChambers.insert(chid);
            }
        }
    }
 
    void MuonTrackTruthTool::addMissedHits(MuonTechnologyTruth& truth, const std::set<Identifier>& ids, const std::set<Identifier>& chids,
                                           const CscSimDataCollection& simCol, bool restrictedTruth) const {
        // loop over sim collection and check whether identifiers are on track
        CscSimDataCollection::const_iterator it = simCol.begin();
        CscSimDataCollection::const_iterator it_end = simCol.end();
        for (; it != it_end; ++it) {
            Identifier id = m_idHelperSvc->layerId(it->first);
 
            int isOnTrack = ids.count(id);
            if (isOnTrack) continue;
 
            // if restricted truth mode, skip if chamber has not hits
            Identifier chid = m_idHelperSvc->chamberId(id);
            bool chamberHasHits = chids.count(chid);
            if (restrictedTruth && !chamberHasHits) continue;
 
            // loop over deposits
            std::vector<CscSimData::Deposit>::const_iterator dit = it->second.getdeposits().begin();
            std::vector<CscSimData::Deposit>::const_iterator dit_end = it->second.getdeposits().end();
            for (; dit != dit_end; ++dit) {
                truth.missedHits.insert(id);
                // only fill a missed chamber if the chamber had no hits
                if (!chamberHasHits) truth.missedChambers.insert(chid);
            }
        }
    }
 
    void MuonTrackTruthTool::addMdtTruth(MuonTechnologyTruth& truth, const Identifier& id, const Trk::MeasurementBase& meas,
                                         const MuonSimDataCollection& simCol) const {
        const MdtDriftCircleOnTrack* mdt = dynamic_cast<const MdtDriftCircleOnTrack*>(&meas);
        if (!mdt) {
            ATH_MSG_WARNING(" dynamic_cast to MdtDriftCircleOnTrack failed for measurement with id " << m_idHelperSvc->toString(id));
            return;
        }
 
        Identifier chid = m_idHelperSvc->chamberId(id);
 
        // find SimData corresponding to identifier
        MuonSimDataCollection::const_iterator it = simCol.find(id);
        if (it == simCol.end()) {
            truth.wrongHits.insert(id);
            truth.wrongChambers.insert(chid);
            return;
        }
 
        std::vector<MuonSimData::Deposit>::const_iterator dit = it->second.getdeposits().begin();
        std::vector<MuonSimData::Deposit>::const_iterator dit_end = it->second.getdeposits().end();
        for (; dit != dit_end; ++dit) {
            double radius = dit->second.firstEntry();
 
            // check whether SDO and hit have same sign, don't check sign if drift radius < 0.3 mm as it will be badly determined
            double checkSign = fabs(mdt->driftRadius()) > 0.3 ? radius * mdt->driftRadius() : 1;
            if (checkSign >= 0) {
                truth.matchedHits.insert(id);
                truth.matchedChambers.insert(chid);
            } else {
                truth.wrongHits.insert(id);
                truth.wrongChambers.insert(chid);
            }
        }
    }
 
    void MuonTrackTruthTool::addClusterTruth(MuonTechnologyTruth& truth, const Identifier& id, const Trk::MeasurementBase& meas,
                                             const MuonSimDataCollection& simCol) const {
        Identifier layid = m_idHelperSvc->layerId(id);
        Identifier chid = m_idHelperSvc->chamberId(id);
 
        MuonSimDataCollection::const_iterator it = simCol.end();
 
        bool goodCluster = false;
        const CompetingMuonClustersOnTrack* crot = dynamic_cast<const CompetingMuonClustersOnTrack*>(&meas);
        if (crot) {
            for (unsigned int i = 0; i < crot->numberOfContainedROTs(); ++i) {
                const MuonClusterOnTrack* cluster = &crot->rioOnTrack(i);
                if (!cluster) continue;
                // find SimData corresponding to identifier
                it = simCol.find(cluster->identify());
                if (it != simCol.end()) {
                    goodCluster = true;
                    break;
                }
            }
        } else {
            // Find SimData corresponding to identifier
            const Trk::RIO_OnTrack* rot = nullptr;
            Trk::RoT_Extractor::extract(rot, &meas);
            const Trk::PrepRawData* prd = rot->prepRawData();
            if (prd) {
                // check if an identifier from the list of RDOs is matched to that in the SDO collection
                const std::vector<Identifier> &rdoList = prd->rdoList();
                std::vector<Identifier>::const_iterator rit = rdoList.begin();
                std::vector<Identifier>::const_iterator rit_end = rdoList.end();
                for (; rit != rit_end; ++rit) {
                    it = simCol.find(*rit);
                    if (it != simCol.end()) {
                        goodCluster = true;
                        break;
                    }
                }
            } else {
                it = simCol.find(id);
                if (it != simCol.end()) goodCluster = true;
            }
        }
 
        if (!goodCluster || it == simCol.end()) {
            truth.wrongHits.insert(id);
            return;
        }
 
        std::vector<MuonSimData::Deposit>::const_iterator dit = it->second.getdeposits().begin();
        std::vector<MuonSimData::Deposit>::const_iterator dit_end = it->second.getdeposits().end();
        for (; dit != dit_end; ++dit) {
            truth.matchedHits.insert(layid);
            truth.matchedChambers.insert(chid);
        }
    }
 
    void MuonTrackTruthTool::addClusterTruth(MuonTechnologyTruth& truth, const Identifier& id, const Trk::MeasurementBase& /*meas*/,
                                             const CscSimDataCollection& simCol) const {
        Identifier layid = m_idHelperSvc->layerId(id);
        Identifier chid = m_idHelperSvc->chamberId(id);
        // find SimData corresponding to identifier
        CscSimDataCollection::const_iterator it = simCol.find(id);
        if (it == simCol.end()) {
            truth.wrongHits.insert(layid);
            truth.wrongChambers.insert(chid);
            return;
        }
 
        std::vector<CscSimData::Deposit>::const_iterator dit = it->second.getdeposits().begin();
        std::vector<CscSimData::Deposit>::const_iterator dit_end = it->second.getdeposits().end();
        for (; dit != dit_end; ++dit) {
            truth.matchedHits.insert(layid);
            truth.matchedChambers.insert(chid);
        }
    }
 
    HepMC::ConstGenParticlePtr MuonTrackTruthTool::getMother(const TruthTrajectory& traj, const int barcodeIn) const {
        ATH_MSG_DEBUG("getMother() : size = " << traj.size());
        int pdgFinal = ((traj.empty()) ? -999 : traj.front().cptr()->pdg_id());
        bool foundBC = false;
        for (const auto& pit : traj) {
            if (!pit) continue;
            if (HepMC::uniqueID(pit) == barcodeIn || foundBC) {
                foundBC = true;
                ATH_MSG_DEBUG("getMother() : " << pit );
#ifdef HEPMC3
                auto particle = pit.scptr();
#else
                auto particle = pit.cptr();
#endif
                if (particle->pdg_id() != pdgFinal) {  // the first case a track had a different flavour
                    break;
                }
            }
        }
        return nullptr;
    }
 
    HepMC::ConstGenParticlePtr MuonTrackTruthTool::getAncestor(const TruthTrajectory& traj, const int barcodeIn) const {
        bool foundBC = false;
        for (const auto& pit : traj) {
            if (!pit) continue;
            if (HepMC::uniqueID(pit) == barcodeIn || foundBC) {
                foundBC = true;
#ifdef HEPMC3
                auto particle = pit.scptr();
#else
                auto particle = pit.cptr();
#endif
                if (!MC::isStable(particle)) {  // first non final state particle
                  return particle;
                }
            }
        }
        return nullptr;
    }
 
    const std::pair<HepMC::ConstGenParticlePtr, unsigned int> MuonTrackTruthTool::getInitialPair(const TruthTrajectory& traj,
                                                                                                 const int barcodeIn) const {
        std::pair<HepMC::ConstGenParticlePtr, unsigned int> thePair(nullptr, 0);
        unsigned int scat = 0;
        ATH_MSG_DEBUG("getFirst() : size = " << traj.size());
        bool foundBC = false;
        int pdgFinal = 0;
        double ePrev = 0.;
        HepMC::ConstGenParticlePtr theFirst{nullptr};
        for (auto pit = traj.begin(); pit != traj.end(); ++pit) {
           if (HepMC::uniqueID(*pit) == barcodeIn || foundBC) {
              auto particle = (*pit).scptr();
#ifdef HEPMC3
                if (!foundBC) {
                    foundBC = true;
                    theFirst = particle;
                    pdgFinal = particle->pdg_id();
                } else {
                    if (particle->pdg_id() == pdgFinal) {
                        const auto& pit_p = *pit;
                        if ((theFirst != pit_p.scptr()) && (particle->momentum().t() != ePrev))
                            ++scat;  // if the particle has not changed pdgid after the first step count as scatter. also avoid counting
                                     // pure interface changes as scatter
                    } else {         // the first time this particle appears
                        --pit;       // AV This is confusing
                        theFirst = (*pit).scptr();
                        break;
                    }
                }
#else
                if (!foundBC) {
                    foundBC = true;
                    theFirst = (*pit).cptr();
                    pdgFinal = (*pit)->pdg_id();
                } else {
                    if ((*pit)->pdg_id() == pdgFinal) {
                        auto pit_p = *pit;
                        if ((theFirst != pit_p.cptr()) && ((*pit).cptr()->momentum().t() != ePrev))
                            ++scat;  // if the particle has not changed pdgid after the first step count as scatter. also avoid counting
                                     // pure interface changes as scatter
                    } else {         // the first time this particle appears
                        --pit;
                        theFirst = (*pit).cptr();
                        break;
                    }
                }
#endif
                ATH_MSG_DEBUG("getFirst() : pt = " << particle->momentum().perp() << " scat = " << scat);
                ePrev = particle->momentum().t();  // prepare for comparing this entry with the next one
            }
        }
        // sanity check
        if (theFirst && theFirst->pdg_id() != pdgFinal) ATH_MSG_ERROR("Wrong pdgId association in getFirst()");
        ATH_MSG_DEBUG("Number of scatters = " << scat << " pdgId = " << pdgFinal);
 
        thePair.first = theFirst;
        thePair.second = scat;
        return thePair;
    }
 
    HepMC::ConstGenParticlePtr MuonTrackTruthTool::getInitial(const TruthTrajectory& traj, const int barcodeIn) const {
        return getInitialPair(traj, barcodeIn).first;
    }
 
    unsigned int MuonTrackTruthTool::getNumberOfScatters(const TruthTrajectory& traj, const int barcodeIn) const {
        return (getInitialPair(traj, barcodeIn)).second;
    }
}  // namespace Muon