DD4hepDetectorConstruction.cpp

Go to the documentation of this file. Or view the newest version in sPHENIX GitHub for file DD4hepDetectorConstruction.cpp

// This file is part of the Acts project.
//
// Copyright (C) 2017-2020 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 "ActsExamples/Geant4DD4hep/DD4hepDetectorConstruction.hpp"

#include <stdexcept>

#include <DD4hep/Detector.h>
#include <DD4hep/Plugins.h>
#include <DDG4/Geant4Converter.h>
#include <DDG4/Geant4GeometryInfo.h>

using namespace ActsExamples;

DD4hepDetectorConstruction::DD4hepDetectorConstruction(
    dd4hep::Detector& detector)
    : G4VUserDetectorConstruction(), m_detector(detector) {}

// See DD4hep::Simulation::Geant4DetectorConstruction::Construct()
G4VPhysicalVolume* DD4hepDetectorConstruction::Construct() {
  dd4hep::sim::Geant4Mapping& g4map = dd4hep::sim::Geant4Mapping::instance();
  dd4hep::DetElement world = m_detector.world();
  dd4hep::sim::Geant4Converter conv(m_detector, 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_detector.apply("DD4hepVolumeManager", 0, 0);
  // Create Geant4 volume manager
  g4map.volumeManager();
  return m_world;
}