GeoConstruction.cpp

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// This file is part of the Acts project.
//
// Copyright (C) 2017 CERN for the benefit of the Acts project
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.

#include "ACTFW/Plugins/DD4hepG4/GeoConstruction.hpp"

#include <stdexcept>

#include "DD4hep/Detector.h"
#include "DD4hep/Plugins.h"
#include "DDG4/Geant4Converter.h"

namespace FW {
namespace DD4hepG4 {
GeoConstruction::GeoConstruction(dd4hep::Detector& lcdd) : m_lcdd(lcdd) {}

// method borrowed from
// DD4hep::Simulation::Geant4DetectorConstruction::Construct()
G4VPhysicalVolume* GeoConstruction::Construct() {
  dd4hep::sim::Geant4Mapping& g4map = dd4hep::sim::Geant4Mapping::instance();
  dd4hep::DetElement world = m_lcdd.world();
  dd4hep::sim::Geant4Converter conv(m_lcdd, dd4hep::INFO);
  dd4hep::sim::Geant4GeometryInfo* geo_info = conv.create(world).detach();
  g4map.attach(geo_info);
  // All volumes are deleted in ~G4PhysicalVolumeStore()
  G4VPhysicalVolume* m_world = geo_info->world();
  m_lcdd.apply("DD4hepVolumeManager", 0, 0);
  // Create Geant4 volume manager
  g4map.volumeManager();
  return m_world;
}
}  // namespace DD4hepG4
}  // namespace FW