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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 #pragma once 0010 0011 #include "Acts/Geometry/GeometryContext.hpp" 0012 #include "Acts/Geometry/GeometryIdentifier.hpp" 0013 #include "Acts/Geometry/TrackingVolume.hpp" 0014 #include "Acts/MagneticField/MagneticFieldContext.hpp" 0015 #include "Acts/Material/AccumulatedSurfaceMaterial.hpp" 0016 #include "Acts/Material/ISurfaceMaterial.hpp" 0017 #include "Acts/Material/MaterialInteraction.hpp" 0018 #include "Acts/Propagator/Navigator.hpp" 0019 #include "Acts/Propagator/Propagator.hpp" 0020 #include "Acts/Propagator/StraightLineStepper.hpp" 0021 #include "Acts/Surfaces/Surface.hpp" 0022 #include "Acts/Utilities/Logger.hpp" 0023 0024 #include <array> 0025 #include <functional> 0026 #include <map> 0027 #include <memory> 0028 #include <vector> 0029 0030 namespace Acts { 0031 0032 class IVolumeMaterial; 0033 class ISurfaceMaterial; 0034 class TrackingGeometry; 0035 struct MaterialInteraction; 0036 0037 /// @brief selector for finding surface 0038 struct MaterialSurface { 0039 /// Selection function for surfaces with material 0040 /// @param sf The surface to check 0041 /// @return True if surface has material, false otherwise 0042 bool operator()(const Surface& sf) const { 0043 return (sf.surfaceMaterial() != nullptr); 0044 } 0045 }; 0046 0047 /// @brief selector for finding volume 0048 struct MaterialVolume { 0049 /// Selection function for volumes with material 0050 /// @param vf The tracking volume to check 0051 /// @return True if volume has material, false otherwise 0052 bool operator()(const TrackingVolume& vf) const { 0053 return (vf.volumeMaterial() != nullptr); 0054 } 0055 }; 0056 0057 /// @brief SurfaceMaterialMapper 0058 /// 0059 /// This is the main feature tool to map material information 0060 /// from a 3D geometry onto the TrackingGeometry with its surface 0061 /// material description. 0062 /// 0063 /// The process runs as such: 0064 /// 0065 /// 1) TrackingGeometry is parsed and for each Surface with 0066 /// ProtoSurfaceMaterial a local store is initialized 0067 /// the identification is done hereby through the 0068 /// Surface::GeometryIdentifier 0069 /// 0070 /// 2) A Cache is generated that is used to keep the filling thread local, 0071 /// the filling is protected with std::mutex 0072 /// 0073 /// 3) A number of N material tracks is read in, each track has : 0074 /// origin, direction, material steps < position, step length, x0, l0, a, 0075 /// z, rho > 0076 /// 0077 /// for each track: 0078 /// surfaces along the origin/direction path are collected 0079 /// the closest material steps are assigned 0080 /// 0081 /// 4) Each 'hit' bin per event is counted and averaged at the end of the run 0082 /// 0083 class SurfaceMaterialMapper { 0084 public: 0085 /// Type alias for straight line propagator used in material mapping 0086 using StraightLinePropagator = Propagator<StraightLineStepper, Navigator>; 0087 0088 /// @struct Config 0089 /// 0090 /// Nested Configuration struct for the material mapper 0091 struct Config { 0092 /// Mapping range 0093 std::array<double, 2> etaRange = {{-6., 6.}}; 0094 /// Correct for empty bins (recommended) 0095 bool emptyBinCorrection = true; 0096 /// Mapping output to debug stream 0097 bool mapperDebugOutput = false; 0098 /// Compute the variance of each material slab (only if using an input map) 0099 bool computeVariance = false; 0100 }; 0101 0102 /// @struct State 0103 /// 0104 /// Nested State struct which is used for the mapping prococess 0105 struct State { 0106 /// @param [in] gctx The geometry context to use 0107 /// @param [in] mctx The magnetic field context to use 0108 State(const GeometryContext& gctx, const MagneticFieldContext& mctx) 0109 : geoContext(gctx), magFieldContext(mctx) {} 0110 0111 /// The accumulated material per geometry ID 0112 std::map<GeometryIdentifier, AccumulatedSurfaceMaterial> 0113 accumulatedMaterial; 0114 0115 /// The created surface material from it 0116 std::map<GeometryIdentifier, std::unique_ptr<const ISurfaceMaterial>> 0117 surfaceMaterial; 0118 0119 /// The surface material of the input tracking geometry 0120 std::map<GeometryIdentifier, std::shared_ptr<const ISurfaceMaterial>> 0121 inputSurfaceMaterial; 0122 0123 /// The volume material of the input tracking geometry 0124 std::map<GeometryIdentifier, std::shared_ptr<const IVolumeMaterial>> 0125 volumeMaterial; 0126 0127 /// Reference to the geometry context for the mapping 0128 std::reference_wrapper<const GeometryContext> geoContext; 0129 0130 /// Reference to the magnetic field context 0131 std::reference_wrapper<const MagneticFieldContext> magFieldContext; 0132 }; 0133 0134 /// Delete the Default constructor 0135 SurfaceMaterialMapper() = delete; 0136 0137 /// Constructor with config object 0138 /// 0139 /// @param cfg Configuration struct 0140 /// @param propagator The straight line propagator 0141 /// @param slogger The logger 0142 SurfaceMaterialMapper(const Config& cfg, StraightLinePropagator propagator, 0143 std::unique_ptr<const Logger> slogger = 0144 getDefaultLogger("SurfaceMaterialMapper", 0145 Logging::INFO)); 0146 0147 /// @brief helper method that creates the cache for the mapping 0148 /// 0149 /// @param [in] gctx The geometry context to use 0150 /// @param [in] mctx The magnetic field context to use 0151 /// @param[in] tGeometry The geometry which should be mapped 0152 /// 0153 /// This method takes a TrackingGeometry, 0154 /// finds all surfaces with material proxis 0155 /// and returns you a Cache object tO be used 0156 /// @return State object configured for material mapping 0157 State createState(const GeometryContext& gctx, 0158 const MagneticFieldContext& mctx, 0159 const TrackingGeometry& tGeometry) const; 0160 0161 /// @brief Method to finalize the maps 0162 /// 0163 /// It calls the final run averaging and then transforms 0164 /// the AccumulatedSurface material class to a surface material 0165 /// class type 0166 /// 0167 /// @param mState 0168 void finalizeMaps(State& mState) const; 0169 0170 /// Process/map a single track 0171 /// 0172 /// @param mState The current state map 0173 /// @param mTrack The material track to be mapped 0174 /// 0175 /// @note the RecordedMaterialSlab of the track are assumed 0176 /// to be ordered from the starting position along the starting direction 0177 void mapMaterialTrack(State& mState, RecordedMaterialTrack& mTrack) const; 0178 0179 /// Loop through all the material interactions and add them to the 0180 /// associated surface 0181 /// 0182 /// @param mState The current state map 0183 /// @param mTrack The material track to be mapped 0184 /// 0185 void mapInteraction(State& mState, RecordedMaterialTrack& mTrack) const; 0186 0187 /// Loop through all the material interactions and add them to the 0188 /// associated surface 0189 /// 0190 /// @param mState The current state map 0191 /// @param rMaterial Vector of all the material interactions that will be mapped 0192 /// 0193 /// @note The material interactions are assumed to have an associated surface ID 0194 void mapSurfaceInteraction(State& mState, 0195 std::vector<MaterialInteraction>& rMaterial) const; 0196 0197 private: 0198 /// @brief finds all surfaces with ProtoSurfaceMaterial of a volume 0199 /// 0200 /// @param mState The state to be filled 0201 /// @param tVolume is current TrackingVolume 0202 void resolveMaterialSurfaces(State& mState, 0203 const TrackingVolume& tVolume) const; 0204 0205 /// @brief check and insert 0206 /// 0207 /// @param mState is the map to be filled 0208 /// @param surface is the surface to be checked for a Proxy 0209 void checkAndInsert(State& mState, const Surface& surface) const; 0210 0211 /// @brief check and insert 0212 /// 0213 /// @param mState is the map to be filled 0214 /// @param tVolume is the volume collect from 0215 void collectMaterialVolumes(State& mState, 0216 const TrackingVolume& tVolume) const; 0217 0218 /// Standard logger method 0219 const Logger& logger() const { return *m_logger; } 0220 0221 /// The configuration object 0222 Config m_cfg; 0223 0224 /// The straight line propagator 0225 StraightLinePropagator m_propagator; 0226 0227 /// The logging instance 0228 std::unique_ptr<const Logger> m_logger; 0229 }; 0230 0231 } // namespace Acts
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