DetectorElement class implementation for DD4hep geometry. More...

#include <ActsPlugins/DD4hep/DD4hepDetectorElement.hpp>

Inheritance diagram for ActsPlugins::DD4hepDetectorElement:

Collaboration diagram for ActsPlugins::DD4hepDetectorElement:

Public Types
using	ContextType = Acts::GeometryContext
	Broadcast the context type.
using	DD4hepVolumeID = dd4hep::DDSegmentation::VolumeID
	Type alias for DD4hep volume identifier used in segmentation.
using	Store
	Define a string based store.
Public Types inherited from ActsPlugins::TGeoDetectorElement
using	ContextType = Acts::GeometryContext
	Broadcast the context type.
using	Identifier = identifier_type
	Identifier alias.
using	identifier_diff = long long
	Identifier difference type.
using	identifier_type = unsigned long long
	Identifier type.

Public Member Functions
	DD4hepDetectorElement (const dd4hep::DetElement detElement, TGeoAxes axes="XYZ", double scalor=1., std::shared_ptr< const Acts::ISurfaceMaterial > material=nullptr)
	Constructor.
const dd4hep::DetElement &	sourceElement () const
	Give access to the DD4hep detector element.
Public Member Functions inherited from ActsPlugins::TGeoDetectorElement
	TGeoDetectorElement (const Identifier &identifier, const TGeoNode &tGeoNode, const Acts::Transform3 &tgTransform, const std::shared_ptr< const Acts::DiscBounds > &tgBounds, double tgThickness=0.)
	Constructor with pre-computed disk surface.
	TGeoDetectorElement (const Identifier &identifier, const TGeoNode &tGeoNode, const Acts::Transform3 &tgTransform, const std::shared_ptr< const Acts::PlanarBounds > &tgBounds, double tgThickness=0.)
	Constructor with pre-computed surface.
	TGeoDetectorElement (const Identifier &identifier, const TGeoNode &tGeoNode, const TGeoMatrix &tGeoMatrix=TGeoIdentity(), TGeoAxes axes="XYZ", double scalor=10., std::shared_ptr< const Acts::ISurfaceMaterial > material=nullptr)
	Constructor.
Identifier	identifier () const
	Get the detector element identifier.
bool	isSensitive () const final
	Is the detector element a sensitive element.
const Acts::Transform3 &	localToGlobalTransform (const Acts::GeometryContext &gctx) const override
	Return local to global transform associated with this identifier.
const Acts::Transform3 &	nominalTransform () const
	Return the nominal - non-contextual transform.
const Acts::Surface &	surface () const override
	Return surface associated with this detector element.
Acts::Surface &	surface () override
	Return surface associated with this detector element.
const TGeoNode &	tgeoNode () const
	Return the TGeoNode for back navigation.
double	thickness () const
	Returns the thickness of the module.
Public Member Functions inherited from Acts::SurfacePlacementBase
virtual	~SurfacePlacementBase ()=default
	Virtual default constructor.

Detailed Description

DetectorElement class implementation for DD4hep geometry.

DetectorElement plugin for DD4hep detector elements. DD4hep is based on TGeo shapes, therefore the DD4hepDetectorElement inherits from TGeoDetectorElement in order to perform the conversion.

The full geometrical information is provided by the TGeoDetectorElement. The DD4hepDetectorElement extends the TGeoDetectorElement by containing a segmentation for the readout.

Member Typedef Documentation

◆ Store

using ActsPlugins::DD4hepDetectorElement::Store

Initial value:

std::map<std::string,

std::vector<std::shared_ptr<DD4hepDetectorElement>>>

Define a string based store.

Constructor & Destructor Documentation

◆ DD4hepDetectorElement()

ActsPlugins::DD4hepDetectorElement::DD4hepDetectorElement	(	const dd4hep::DetElement	detElement,
		TGeoAxes	axes = "XYZ",
		double	scalor = 1.,
		std::shared_ptr< const Acts::ISurfaceMaterial >	material = nullptr )

explicit

Constructor.

Parameters

detElement	The DD4hep DetElement which should be associated to an ACTS surface
axes	is the axis orientation with respect to the tracking frame it is a string of the three characters x, y and z (standing for the three axes) There is a distinction between capital and lower case characters : capital -> positive orientation of the axis lower case -> negative orientation of the axis

Example options are:

"XYZ" -> identical frame definition (default value)
"YZX" -> node y axis is tracking x axis, etc.
"XzY" -> negative node z axis is tracking y axis, etc.
Parameters

scalor is the scale factor for unit conversion if needed

Note
In the translation from a 3D geometry (TGeo) which only knows tubes to a 2D geometry (Tracking geometry) a distinction if the module should be described as a cylinder or a disc surface needs to be done. Since this information can not be taken just from the geometry description (both can be described as TGeoTubeSeg), one needs to set the flag 'isDisc' in case a volume with shape TGeoTubeSeg should be translated to a disc surface. Per default it will be translated into a cylindrical surface.

Parameters

material Optional material of detector element

Member Function Documentation

◆ sourceElement()

const dd4hep::DetElement & ActsPlugins::DD4hepDetectorElement::sourceElement ( ) const

Give access to the DD4hep detector element.

Returns: Reference to the underlying DD4hep detector element

Public Types