Hi Pilou, your example #3 was a bit easier to examine since there are not quite so many pieces.

But this is also another case that will be difficult to fix up soon. It is a bug in the processing of 2 surfaces that touch each other like this:



In some circumstances like this where 2 surfaces just exactly touch each other at a point, the geometry library gets confused about which resulting piece is supposed to be kept and which is supposed to be discarded. I've seen this one a couple of times. It's another one that I hope will be solved by an update to the geometry library in a future version after V1.

It's another example of problems involving different pieces just barely overlapping or touching each other.

- Michael