Hi Pilou,

> "With SMT Button pressed mesh will be Smoothed then Divided"

Yes - it looks like ZBrush has some kind of bug in the smoothing process, looks like it may have to do with processing polygons that have a high valence vertex in them. That's a vertex that has a large number of edges radiating out from it, which is the case in pole points like that.

Vertices with a high valence can have some difficulties in certain smooth subdivision schemes.

So turning off the smoothing process avoids the problem in ZBrush.

- Michael