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Delaunay triangulation and Point3f


I'm trying to create a delaunay triangulation from a set of point 3f. The 2 first coordinates are the coordinates in the plan and the third one is the value of my data at that point (the goal is to create isolines).

I have tried to use SubDiv2D but the problem is that it take point 2f and return a list of Vec6f and so I have to find the association of each point2f with my point3f. Is there a way to get the indice from the vector of input instead of the coordinates ?