Hi PaQ,

> The strange thing is that this geometry here is unselectable ...

Just a quick note - this typically means that the object has a surface in it that has degenerate trims - that is that the trims are totally squished down flat together making the active part of the surface inside the trim a kind of infinitely thin slice.

That kind of thing will cause the mesher to fail, and the regular mouse-picking selection uses that mesh data so that interferes with selecting those squished things.

But they can be selected by doing Select All, or Invert.


Anyway, that's what is going on with pieces like that, that look like curves but are actually squished degenerate surfaces.

- Michael