Class Acts::VolumeMaterialMapper

class Acts::VolumeMaterialMapper

VolumeMaterialMapper.

This is the main feature tool to map material information from a 3D geometry onto the TrackingGeometry with its surface material description.

The process runs as such:

1) TrackingGeometry is parsed and for each Volume with ProtoVolumeMaterial a local store is initialized the identification is done hereby through the Volume::GeometryIdentifier

2) A number of N material tracks is read in, each track has : origin, direction, material steps (< position, step length, x0, l0, a, z, rho >, thichness)

for each track: volume along the origin/direction path are collected. the step are then associated to volume inside which they are. Additional step are created along the track direction.

3) Each ‘hit’ bin per event is counted and averaged at the end of the run

Public Types

using StraightLinePropagator = Propagator<StraightLineStepper, Navigator>

Public Functions

VolumeMaterialMapper() = delete

Delete the Default constructor.

VolumeMaterialMapper(const Config &cfg, StraightLinePropagator propagator, std::unique_ptr<const Logger> slogger = getDefaultLogger("VolumeMaterialMapper", Logging::INFO))

Constructor with config object.

Parameters
  • cfg – Configuration struct

  • propagator – The straight line propagator

  • slogger – The logger

State createState(const GeometryContext &gctx, const MagneticFieldContext &mctx, const TrackingGeometry &tGeometry) const

helper method that creates the cache for the mapping

This method takes a TrackingGeometry, finds all surfaces with material proxis and returns you a Cache object tO be used

Parameters
  • gctx[in] The geometry context to use

  • mctx[in] The magnetic field context to use

  • tGeometry[in] The geometry which should be mapped

void finalizeMaps(State &mState) const

Method to finalize the maps.

It calls the final run averaging and then transforms the AccumulatedVolume material class to a surface material class type

Parameters

mState

void mapMaterialTrack(State &mState, RecordedMaterialTrack &mTrack) const

Process/map a single track.

Note

the RecordedMaterialSlab of the track are assumed to be ordered from the starting position along the starting direction

Parameters
  • mState – The current state map

  • mTrack – The material track to be mapped

struct Config

Nested Configuration struct for the material mapper.

Public Members

float mappingStep = 1.

Size of the step for the step extrapolation.

struct State

Nested State struct which is used for the mapping prococess.

Public Functions

inline State(const GeometryContext &gctx, const MagneticFieldContext &mctx)

Constructor of the Sate with contexts.

Public Members

std::reference_wrapper<const GeometryContext> geoContext

Reference to the geometry context for the mapping.

std::reference_wrapper<const MagneticFieldContext> magFieldContext

Reference to the magnetic field context.

std::map<GeometryIdentifier, BinUtility> materialBin

The binning per geometry ID.

std::map<GeometryIdentifier, RecordedMaterialVolumePoint> recordedMaterial

The recorded material per geometry ID.

std::map<GeometryIdentifier, std::shared_ptr<const ISurfaceMaterial>> surfaceMaterial

The surface material of the input tracking geometry.

std::map<GeometryIdentifier, std::unique_ptr<const IVolumeMaterial>> volumeMaterial

The created volume material from it.