Polygons from curves problem

[laurent_delrieu]

Hello
I think you misused Voronoi term. For the drawing I don’t seem a lot of Voronoi cells!
In the script there are no points for the Voronoi Diagram.

Your problem could be solved using Surface Split component or using this discussion

From edge bundling / wooly paths to surface between

Thanks for the tip and the good exercice. I took a look to this problem, I used mesh instead of surface, so faces acts like pixels, I made a little C# in order to have the difference between two subsets. The list of face number (0 to n-1) and the list of faces intersecting the curves. All others component must be legacy Rhino. It tooks 15 s with 32 000 points, length of 1 15 s with 120 000 points, length of 1 105 s with 962 000 points, length of 0.5 [image] [image] [image] If you want …