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-.
Find the sum of all the numbers of the input vector
Unique values without using UNIQUE function
Wheat on a chessboard pt 2
Insert zeros into vector
Side of an equilateral triangle
Query every vertices neighbor indices
Find triangles from edge
Find neighbor triangle indices
Remove duplicated triangles
Query a vertex neighbors
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