I made a surface as a terrain model using patch. I'd like the boundary edge of the patch surface to remain fixed as I modify the control points making up the patch. When I modify the control points the surface splits away from the original boundary curves.
I tried untrimming and shrinking the trimmed surface, but I'm not able to make that work.
Is there an easy way to hold the trimmed patch boundary steady as I modify the patch control points?
Thanks for any suggestions.