OpDetReadoutGeometry.h

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////////////////////////////////////////////////////////////////////////
/// \file OpDetReadoutGeometry.h
//
/// \author  bjpjones@mit.edu
////////////////////////////////////////////////////////////////////////
// OpDetReadoutGeometry
//
// Ben Jones, MIT, 07/16/10
//
// OpDet's are defined with a particular geometry, and only some part of the OpDet
// is sensitive.  When several are placed, only the mother volume, vol_OpDet is
// replicated.  Each constituent volume, including the sensitive volume, only
// exists once in the volume store, as a daughter of the mother volume.
//
// Hence to know which OpDet a photon steps into when it is inside a sensitive
// volume, we must define a readout geometry to identify which volumes are
// contained within each OpDet.
//
// This class is heavily based on LArG4ReadoutGeometry by Bill Seligman,
// which is very well commented.  See that file for further reference.
//

#ifndef OpDetReadoutGeometry_h
#define OpDetReadoutGeometry_h

#include "Geant4/G4String.hh"
#include "Geant4/G4Transform3D.hh"
#include "Geant4/G4VUserParallelWorld.hh"

#include <vector>

class G4LogicalVolume;
class G4VPhysicalVolume;

namespace larg4 {

  class OpDetReadoutGeometry : public G4VUserParallelWorld {
  public:
    OpDetReadoutGeometry(G4String OpDetSensitiveName,
                         const G4String name = "OpDetReadoutGeometry",
                         bool useLitePhotons = false);
    virtual ~OpDetReadoutGeometry();

    virtual void Construct();

  private:
    void FindVolumes(G4VPhysicalVolume*,
                     G4String,
                     std::vector<G4Transform3D>,
                     std::vector<G4LogicalVolume*>&,
                     std::vector<G4Transform3D>&);
    std::vector<G4LogicalVolume*> fOpDetVolumes;
    std::vector<G4Transform3D> fOpDetTransformations;
    bool const fUseLitePhotons; ///< Pass-through option for sensitive detector.
    G4String fOpDetSensitiveName;
  };

}

#endif