MaterialTrackRecorder.h

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/*
  Copyright (C) 2002-2026 CERN for the benefit of the ATLAS collaboration
*/
 
#ifndef ACTSGEOMETRY_MATERIALTRACKRECORDER_H
#define ACTSGEOMETRY_MATERIALTRACKRECORDER_H
 
#include "AthenaBaseComps/AthMessaging.h"
#include "ActsGeometry/RecordedMaterialTrackCollection.h"
 
#include "Acts/Definitions/Algebra.hpp"
#include "Acts/Definitions/Units.hpp"
#include "CLHEP/Units/SystemOfUnits.h"
 
#include "G4UserEventAction.hh"
#include "G4UserRunAction.hh"
#include "G4UserSteppingAction.hh"
#include "G4ThreeVector.hh"
 
class G4Event;
class G4Run;
class G4Step;
 
 
namespace ActsTrk
{
 
    class MaterialTrackRecorder: public AthMessaging, public G4UserEventAction,
                                 public G4UserRunAction, public G4UserSteppingAction
    {
        public:
            struct Config {
                std::string materialTrackCollectionName = "MaterialTracks";
                std::vector<std::string> excludeMaterials = {"Air", "Vacuum"};
 
            };
 
            MaterialTrackRecorder(const Config& config);
            virtual void BeginOfEventAction(const G4Event*) override;
            virtual void EndOfEventAction(const G4Event*) override;
            virtual void BeginOfRunAction(const G4Run*) override;
            virtual void UserSteppingAction(const G4Step*) override;
 
        private:
            RecordedMaterialTrackCollection* m_rmtCollection{nullptr};
            constexpr static double s_convertLength = Acts::UnitConstants::mm / CLHEP::mm;
            constexpr static double s_convertDensity =
                (Acts::UnitConstants::g / Acts::UnitConstants::mm3) / (CLHEP::gram / CLHEP::mm3);

            Config m_cfg;

            Acts::Vector3 convertPosition(const G4ThreeVector& g4vec) {
                return Acts::Vector3(g4vec[0] * s_convertLength, g4vec[1] * s_convertLength,
                                    g4vec[2] * s_convertLength);
            }

            Acts::Vector3 convertDirection(const G4ThreeVector& g4vec) {
                return Acts::Vector3{g4vec[0], g4vec[1], g4vec[2]};
            }
 
    }; // class MaterialTrackRecorder
 
} // namespace ActsTrk
 
#endif