I just noticed control points beyond the border of the surface created by PlanarSrf from closed curves. To me, it’s “uncomfortable looking”.
Is there any reason to use one method over the other, other than PlanarSrf is a safeguard to guarantee flat??
trimmed surfaces will always have points beyond the trimmed edges.
Unless you use ShrinkTrimmedSrfToEdge on the example above…
even in that example, you have control objects beyond the trim edges.
nurbs surfaces are always 4 sided… trim them and you will have control object s beyond their edges-
Yes, but the points will be on the corners.
To make your EdgeSrf, you have to make the rectangle then explode it so you can use the 4 curves to make the surface. It would be faster to use the Plane command and pick two points and you get the same result.
Using the Plane command will guarantee its flat and you get the control points on the corners if that makes you comfortable.
I like that - thanks!
semantics.. 
the actual underlying structure of the surface will always be there no matter how you trim it…
unless the trimmed surface is 4 sided and you can shrink it to fit the new trimmed edges.
I shrunk it, and it is fine - as long as I can make the part, I’m happy.
Thanks, everyone!
