src/detail/GeoIntersectionAnnulusConverter.cpp

0001 // This file is part of the ACTS project.
0002 //
0003 // Copyright (C) 2016 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 https://mozilla.org/MPL/2.0/.
0008
0009 #include "Acts/Plugins/GeoModel/detail/GeoIntersectionAnnulusConverter.hpp"
0010
0011 #include "Acts/Definitions/Common.hpp"
0012 #include "Acts/Definitions/Units.hpp"
0013 #include "Acts/Plugins/GeoModel/GeoModelConversionError.hpp"
0014 #include "Acts/Surfaces/AnnulusBounds.hpp"
0015 #include "Acts/Surfaces/DiscSurface.hpp"
0016 #include "Acts/Surfaces/Surface.hpp"
0017 #include "Acts/Surfaces/detail/AnnulusBoundsHelper.hpp"
0018
0019 #include <algorithm>
0020
0021 #include <GeoModelKernel/GeoFullPhysVol.h>
0022 #include <GeoModelKernel/GeoGenericTrap.h>
0023 #include <GeoModelKernel/GeoLogVol.h>
0024 #include <GeoModelKernel/GeoShape.h>
0025 #include <GeoModelKernel/GeoShapeIntersection.h>
0026 #include <GeoModelKernel/GeoShapeShift.h>
0027 #include <GeoModelKernel/GeoTubs.h>
0028
0029 Acts::Result<Acts::GeoModelSensitiveSurface>
0030 Acts::detail::GeoIntersectionAnnulusConverter::operator()(
0031     const PVConstLink& geoPV, const GeoShapeIntersection& geoIntersection,
0032     const Transform3& absTransform, Acts::SurfaceBoundFactory& boundFactory,
0033     bool sensitive) const {
0034   /// auto-calculate the unit length conversion
0035   static constexpr double unitLength =
0036       Acts::UnitConstants::mm / GeoModelKernelUnits::millimeter;
0037
0038   // Returns the first operand being ANDed
0039   const GeoShape* opA = geoIntersection.getOpA();
0040   const GeoShape* opB = geoIntersection.getOpB();
0041
0042   const GeoTubs* tubs = dynamic_cast<const GeoTubs*>(opA);
0043   if (tubs != nullptr) {
0044     // rMin, rMax
0045     double rMin = unitLength * tubs->getRMin();
0046     double rMax = unitLength * tubs->getRMax();
0047
0048     // Get the shift
0049     const GeoShapeShift* shapeShift = dynamic_cast<const GeoShapeShift*>(opB);
0050     if (shapeShift != nullptr) {
0051       const Transform3& shift = shapeShift->getX();
0052       const GeoGenericTrap* trap =
0053           dynamic_cast<const GeoGenericTrap*>(shapeShift->getOp());
0054       if (trap != nullptr) {
0055         double thickness = 2 * unitLength * trap->getZHalfLength();
0056         //    X half length at -z, -y.
0057         auto trapVertices = trap->getVertices();
0058
0059         std::vector<Vector2> faceVertices(trapVertices.begin(),
0060                                           trapVertices.begin() + 4u);
0061         // to make sure they are in the right order
0062         std::ranges::sort(faceVertices, std::greater{}, [](const auto& f) {
0063           return (VectorHelpers::phi(f));
0064         });
0065
0066         // Turn them into global
0067         std::vector<Vector3> faceVertices3D;
0068         for (const auto& v : faceVertices) {
0069           faceVertices3D.push_back(
0070               shift * Vector3{unitLength * v.x(), unitLength * v.y(), 0.});
0071         }
0072
0073         faceVertices.clear();
0074         for (auto& v : faceVertices3D) {
0075           faceVertices.push_back(v.block<2, 1>(0, 0));
0076         }
0077
0078         auto [annulusBounds, annulusTransform] =
0079             Acts::detail::AnnulusBoundsHelper::create(absTransform, rMin, rMax,
0080                                                       faceVertices);
0081         if (!sensitive) {
0082           auto surface = Surface::makeShared<DiscSurface>(
0083               annulusTransform, boundFactory.insert(annulusBounds));
0084           return std::make_tuple(nullptr, surface);
0085         }
0086
0087         // Create the detector element
0088         auto detectorElement =
0089             GeoModelDetectorElement::createDetectorElement<DiscSurface>(
0090                 geoPV, boundFactory.insert(annulusBounds), annulusTransform,
0091                 thickness);
0092         auto surface = detectorElement->surface().getSharedPtr();
0093         return std::make_tuple(detectorElement, surface);
0094       }
0095       return std::make_tuple(nullptr, nullptr);
0096     }
0097     return std::make_tuple(nullptr, nullptr);
0098   }
0099   return std::make_tuple(nullptr, nullptr);
0100 }