algorithmic modeling for Rhino
The 2D voronoi component only works on a flat, infinite 2D plane. Sometimes you can wrap the resulting geometry onto a surface, but it won't work if the total curvature is too big and when the surface is closed.
You could try generating a 3D voronoi instead and intersecting it with your shape. You'll get weird results if the voronoi cells are large compared to the surface detail though.
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