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0001 (geometry_impl)=
0002
0003 # Geometry module
0004
0005 The ACTS geometry model is strongly based on the ATLAS Tracking geometry. Its
0006 core is built on a surface-based description that make up all geometry objects
0007 of higher complexity. This design has been chosen as the surface objects can be
0008 used together with the track propagation module and thus all geometry objects
0009 become natively integrated into the tracking software.
0010
0011 ```{note}
0012 There is an ongoing rewrite of the geometry and navigation modules where
0013 logical layers will be modelled as volumes, see [](layerless_geometry).
0014
0015 ```
0016
0017 :::{toctree}
0018 :maxdepth: 1
0019 concepts
0020 geometry_id
0021 material
0022 surfaces
0023 legacy/legacy
0024 construction
0025 layerless/layerless
0026 :::
