Hi, I’m stuffing around with feeding it different curves but I dont really know. It was working when I used curve extend and cutting them by extensions to make the closed curve. But I had to change it to extending curves by a vector and line at start and end and join them. Then for the split at point to work I changed that to nurbs curve, trade one thing working for another.
It seems that your polycurve is already on the surface, but that the surface doesn’t have any surface inside of the polycurve… or am I missing something?
Ow I have the preview geometry off
Patch curves, thicken, intersect surface gives me I what I need for now