Hi,

did a double-moebius strip last night and had a weird problem with the shell command. (Idea from Rinus Roelofs - http://www.rinusroelofs.nl/rhinoceros/rhinoceros-m06.html ).





You see the original joined surface and my first attempt to shell it, using the centerline option. The surface was made last night so I can't tell you what steps I took to join it. But in the right example I've used the separate command and then the join command and then the shelling works fine.

Any thoughts of what went wrong?

/Lars