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-.
Bottles of beer
Sum the entries of each column of a matrix which satisfy a logical condition.
Is this triangle right-angled?
Query every vertices neighbor indices
Find a common edge
Query a vertex neighbors
Remove duplicated vertices
Query edges list
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