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A useful property of geometric meshes is the adjacency relationship between faces of the mesh as defined by sharing triangle edges.

The*adjacency* is represented as an array of uint32_t index values with 3 entries for each triangular face in the mesh. Each entry is the
*face index* of the triangular face that is adjacent to one edge of the triangular face (hence as there are three edges, there can be up to 3 triangular faces that share an edge). If there is no adjacent face, the index is set to -1u ( a.k.a. static_cast<uint32_t>(-1)).

The*point representative* (aka point rep) is an array of uint32_t index values with one entry for each vertex in the mesh. Each entry is the
*vertex index* of a vertex with a unique position. If there are no vertices that share the same location, each entry of the pointrep array is the identity (i.e. pointrep[ i ] is i). If there are duplicated vertex positions in the mesh, then some entry
will point to another 'representative' vertex index.

GenerateAdjacencyAndPointReps

ConvertPointRepsToAdjacency

GenerateGSAdjacency

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GenerateAdjacencyAndPointReps

ConvertPointRepsToAdjacency

GenerateGSAdjacency

Last edited Jun 5, 2014 at 6:24 PM by walbourn, version 3