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0001 (geometry_impl)=
0002 # Geometry module
0003
0004 The ACTS geometry model is strongly based on the ATLAS Tracking geometry. Its
0005 core is built on a surface-based description that make up all geometry objects
0006 of higher complexity. This design has been chosen as the surface objects can be
0007 used together with the track propagation module and thus all geometry objects
0008 become natively integrated into the tracking software.
0009
0010 ```{note}
0011 There is an ongoing rewrite of the geometry and navigation modules where
0012 logical layers will be modelled as volumes, see [](layerless_geometry).
0013
0014 ```
0015
0016 :::{toctree}
0017 :maxdepth: 1
0018 geometry_id
0019 material
0020 surfaces
0021 legacy/legacy
0022 layerless/layerless
0023 :::
0024
