Hi Omkar,I'm guessing you're getting an error because the "intline" is not a line but a curve. The intersection needs to be a line for the waffle to work, if it's a curve your material will not intersect proper. In any case sometimes the intersection is in fact a line, but Rhino sometimes likes to mess with you and returns a curve =)What you could try to do is to change line 26 to: checkint=rs.IsCurve(intline)Be advised that when your intersections between your Breps are far of from being lines, the assembling of your waffle might not work.Good luck!Arie