AirTube_geo.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/.

// This DD4hep Constructor is strongly inspired by (adds the ActsExtension)
// https://github.com/AIDASoft/DD4hep/tree/master/examples/SimpleDetector

// $Id: $
//====================================================================
//  // Simple tube filled with air
//  // used for tracking purposes ...
//
//--------------------------------------------------------------------
//
//  Author     : F.Gaede
//
//====================================================================
#include "Acts/Plugins/DD4hep/ActsExtension.hpp"

#include "DD4hep/DetFactoryHelper.h"

using namespace dd4hep;

static Ref_t create_element(Detector& lcdd, xml_h e,
                            SensitiveDetector /* sens */) {
  xml_det_t x_det = e;
  std::string name = x_det.nameStr();

  DetElement airTube(name, x_det.id());
  // Extension to Detlement for the RecoGeometry
  Acts::ActsExtension* airTubeExtension = new Acts::ActsExtension();
  airTubeExtension->addType("beampipe", "layer");
  airTube.addExtension<Acts::ActsExtension>(airTubeExtension);

  PlacedVolume pv;

  // ----- read xml ----------------------

  xml_dim_t dim = x_det.dimensions();

  double inner_r = dim.rmin();
  double outer_r = dim.rmax();
  double z_half = dim.zhalf();

  //--------------------------------------

  Tube tubeSolid(inner_r, outer_r, z_half);

  Volume tube_vol(name + "_inner_cylinder_air", tubeSolid,
                  lcdd.material("Air"));

  Volume mother = lcdd.pickMotherVolume(airTube);

  pv = mother.placeVolume(tube_vol);

  pv.addPhysVolID("system", x_det.id());

  airTube.setPlacement(pv);

  return airTube;
}

DECLARE_DETELEMENT(AirTube, create_element)