hi all i'm trying to extract the k1 and k2 of the principal curvature node (inside surface analysis)but writing inside a VBnode. i'm having a problem with the surface which apparently is "protected" i thought calling the surface of a Brep is as easy as calling the m_s property, is it? do i have to use 2 evaluate methods (s.Ev2Der and then s.EvNormal) to achieve the k1 and k2? thanks
http://groups.google.com/group/grasshopper3d/web/k1.ghx
