@Pascal is this not true for the underlying mathematics in Rhino? @John_Brock you like to quote the NURBS definitions to me, do you know? @bobmcneel ?
I might embarrass myself here, but what the heck:
G3 surface/curve/edge used to project normal (pull) trim a surface, always yields a G2 edge. This is predictable. This is set in stone.
Is there a setting I’ve missed in Rhino, or why does this happen? What am I not understanding about Rhino here?
test.stp (17.3 KB)