Shell not working

 From:  manz
2780.2 In reply to 2780.1 
Hi Rob,

There is a problem at the top of the surface, the center spline is outside the surface boundary. Making an offset shows unwanted geometry.

Zooming in to that area on your surface shows:-

I made an edit by splitting the side splines and making blends between them, and removed the cp point that was outside the boundary. Then made a net surface:-

Shelling is now possible.

- Steve

EDITED: 3 Aug 2009 by MANZ