Does anybody knows how to built a volume in Gambit which is formed by a smooth transition from rectangular (not square) to circular contour (the laters' diameter is smaller than the sides of the former)? Thanks a lot.

I'm afraid that's not quite possible in Gambit. This is a job for much more professional CAD programs, like CATIA for example. There you could use a "loft" operation and your problem will be solved in a matter of seconds.

Best whishes, Razvan

Thanks, I've done it in Solidworks. BTW, from square (not rectangular) to the concentric circle it is possible in Gambit through the variable radius feature. Regards, Alex.