Half Edge Library
A half-edge is a data structure that holds polygonal manifolds (a
polygonal mesh without wedges or pinched vertices) and allows efficient
queries regarding the connectivity of the manifold. For example, you
can ask which edges are adjacent to a vertex, which faces are on either
side of an edge, you can traverse the edges around a face in
counterclockwise order, etc. Development for this library is helped by the
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