Info : T is actually a triangulation -list of triangles-, in which each index corresponding to the row index of a vertex in another list -a vertices list-, it is a widely used technique used to store and write triangular meshes in mesh processing. Here below the example is a tetrahedron -4 facets-.
Generate a vector like 1,2,2,3,3,3,4,4,4,4
Triangular matrices in 3D array
Remove duplicated vertices
Find a common vertex
Query edges list
Query a vertex neighbors
Find a common edge
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