Plugins/Geant4/Geant4DetectorElement.hpp

0001 // This file is part of the Acts project.
0002 //
0003 // Copyright (C) 2022 CERN for the benefit of the Acts project
0004 //
0005 // This Source Code Form is subject to the terms of the Mozilla Public
0006 // License, v. 2.0. If a copy of the MPL was not distributed with this
0007 // file, You can obtain one at http://mozilla.org/MPL/2.0/.
0008
0009 #pragma once
0010
0011 #include "Acts/Definitions/Algebra.hpp"
0012 #include "Acts/Geometry/DetectorElementBase.hpp"
0013 #include "Acts/Geometry/GeometryContext.hpp"
0014 #include "Acts/Surfaces/Surface.hpp"
0015
0016 #include <memory>
0017
0018 class G4VPhysicalVolume;
0019
0020 namespace Acts {
0021
0022 class ISurfaceMaterial;
0023 class Surface;
0024
0025 /// @class Geant4DetectorElement
0026 ///
0027 /// Detector element representative for Geant4 sensitive
0028 /// elements.
0029 class Geant4DetectorElement : public DetectorElementBase {
0030  public:
0031   /// Broadcast the context type
0032   using ContextType = GeometryContext;
0033
0034   /// @brief  Constructor with arguments
0035   /// @param surface the surface representing this detector element
0036   /// @param g4physVol the physical volume representing this detector element
0037   /// @param toGlobal the global transformation before the volume
0038   /// @param thickness the thickness of this detector element
0039   Geant4DetectorElement(std::shared_ptr<Surface> surface,
0040                         const G4VPhysicalVolume& g4physVol,
0041                         const Transform3& toGlobal, ActsScalar thickness);
0042
0043   /// Return local to global transform associated with this detector element
0044   ///
0045   /// @param gctx The current geometry context object, e.g. alignment
0046   const Transform3& transform(const GeometryContext& gctx) const override;
0047
0048   /// Return surface associated with this detector element
0049   const Surface& surface() const override;
0050
0051   /// Non-const access to surface associated with this detector element
0052   Surface& surface() override;
0053
0054   /// Return the thickness of this detector element
0055   ActsScalar thickness() const override;
0056
0057   /// @return to the Geant4 physical volume
0058   const G4VPhysicalVolume& g4PhysicalVolume() const;
0059
0060  private:
0061   /// Corresponding Surface
0062   std::shared_ptr<Surface> m_surface;
0063   /// The GEant4 physical volume
0064   const G4VPhysicalVolume* m_g4physVol{nullptr};
0065   /// The global transformation before the volume
0066   Transform3 m_toGlobal;
0067   ///  Thickness of this detector element
0068   ActsScalar m_thickness{0.};
0069 };
0070
0071 }  // namespace Acts