Can I wire cut a surface?

Problem20.3dm (115.8 KB)

In the attached I have a line and a surface. I want to cut the surface along the line (Top View). When I do a wire cut, I get the error

“Curve Normal is ambiguous. Direction is set to CPlane Normal”

if i understand what you’re after, i think you’d be better off using Split or Trim here.

Use Trim with ApparentIntersections=Yes in the appropriate view to trim part of the surface with the projection of the line on the surface.

To split the surface with the line first Project the line onto the surface in the appropriate view, then use Split.

Thanks, my misconception is that using TRIM/SPLIT on curves seems to require they be in the same plane. I projected that to surfaces.