ITK provides basic classes to represent geometrical concepts. Despite not being a computational geometry modelling toolkit, ITK offers a set of such elements necessary for common procedures in image processing.

This document presents the different geometric concepts used in the toolkit, as well as their relationships and how they can effectively be used.

The toolkit supports representing meshes of different nature and points through the itk::Mesh, itk::QuadEdgeMesh, and itk::Point classes.