Hi DesuDeus,

> Does the "avoid smaller than X" can cause shading issues ?

Well, it makes for rougher and coarser meshes being made on smaller sized pieces.

That setting is for making small sized details (ones smaller than the distance value that you put in there) to be done with a much rougher angle so things like little tiny fillets will use only a small number of polygons rather than little sized rounded pieces using the same number of polygons as regular sized polygons.

You should generally only use that setting if you are trying to optimize for a lower polygon count. If you're trying to get a high detail model don't set that at all (or set it to 0 to clear it), since it's all about reducing mesh density.

- Michael