I’m just curious because I don’t see the probem.
trim.3dm (60.3 KB)
Trimming with 3D curves in a perspective viewport shoud, I’ve been told, automatically pull the curves to the surface, and since these curves are either G2 or overlapping, that should work?
EDIT: I’m trying to trim away the top right corner!
EDIT: I can’t even split the surface with a view based projection, so now I’m even more confused.