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0001 # Tracking geometry building
0002
0003 ## TrackingGeometry building using a KDTree and a Proto Description
0004
0005 For cylindrical detectors there exist a generic tracking geometry building module,
0006 based on KDTree and a proto description.
0007
0008 This building procedure uses a {struct}`Acts::ProtoDetector` description which provides a
0009 high level description of layers and container volumes, together with some
0010 binning and ordering information.
0011 This proto description is then used to assign surfaces that are provided to the
0012 {class}`Acts::KDTreeTrackingGeometryBuilder` using an internal query to the KD-tree structure.
0013
0014 ## Blueprint tree mechanism to build a tracking geometry
0015
0016 :::{todo}
0017 Add description of Blueprint tree and how it can be used to create layerless detector.
0018 :::
