The {class}Acts::GeometryIdentifier is mainly used for fast identification of the type of the geometry object (as most of them are either extensions or containers of the {class}Acts::Surface objects) and for the identification of the geometry surfaces after building, e.g. for the uploading/assigning of material to the surface after creation. The {class}Acts::GeometryIdentifier uses a simple masking procedure for applying an identification schema.

While it is used in ACTS-internal applications such as material mapping, it is not employed for EventData and Geometry identification in an experiment setup. Instead, one should define and use the Identifier class in the latter case.

:::{doxygenclass} Acts::GeometryIdentifier

members: kVolumeMask,kBoundaryMask,kLayerMask,kApproachMask,kSensitiveMask,kExtraMask

:::