Why Surface Split freezes Rhino in this case?

Surface Split freezes Rhino.gh (10.6 KB)

I can solve this by rebuilding the surface, but I still like to learn why it failed with the original surface.
Thanks!

Surface Split is innocent here.
Your surface is bad:
bad nurbs surface
That control point structure is definitively wrong, avoid such constructions.
Even moving that control point by a bit is enough. But it being coincident with the other is a no-go.


1 Like

The points are in the same position, now I see why. Thank you very much!