Hi all, i am a novice star cd user.Using proam i was trying to mesh my model ie)a straight air duct.I followed the steps mentioned in the tutorials and when i try to generate sub surface i see one of the wall surface touching the subsurface completely(looks like its merged together)whereas in the tutorial it is mentioned the surfaces should not be n contact.(the inlet,outlet and the other end of the wall surface has no contact with the subsurface).can anybody help??

thanks, ramesh

Look for variable thickness option in subsurface generation.

Thanks Sidd, will try that.

It could also point to a problem in the original surface, if it is poor quality the subsurfacer may not be able to offset the shells correctly and will reduce the subsurface to zero