Hi Marco, that's a bug in V3 that has already been fixed in V4. The bug had to do with the fillet corners for the circular case not creating an analytic sphere surface class. When you save and reload the file it does get a specialized analytic sphere surface type for the corners and that's what makes the different behavior in v3.
According to my notes it was reported by Pilou last year through e-mail and I fixed it on May 22, 2017 so all released versions of v4 should have the fix in it.
> P.S. The same identical behavior happens if I use the "Inset" command.
Same thing there as well - should be fixed in v4 already.
SubD trials in Pilou's instructions. Tried to draw upholstery parts of a chair with SubD. It is necessary to rethink something, because the result is not yet visible when the initial form is created.
I created this one from a cuboid and used "bridge" for the "nose" in front of the seat. Then I noticed that once you split the surfaces with Split or Iso, you get points in the body that can be moved. In this way, it is possible to get closer to the desired shape and achieve the desired "upholstery effect".
Thanks for the help, you can see, it'll be all right.....
Take 2 sets and use the ISect Boolean Function! ( whith Union Sets disabled )
then ExplodeMove hidden function
Have fun!
Here twice the same but you can take any things! :)