Check if span is inside trimmed surface / control point affects trimmed surface

Hey, is there a fast and simple way to check whether a span is inside the trimmed domain of a NURBS surface? I thought of trimming the span out and then do an intersection, which will probably be very slow. Another option would be to check if the corner points and some points inside the span are inside the trimming domain, which is not very reliable. But maybe there is a direct way to check this? My goal is to determine if changing the position of a control point has an effect on the shape of the trimmed surface.

Hi @am.bauer,

Sorry I missed this.

Try using 2D curves. Make a rectangle for the span in question and intersect that with the 2D trimming curves.

ā€“ Dale

Thank you! This is a very good solution!