Is that normal? (it's a same curve // but more long for the second)
I suppose yes but...

Hi Pilou, it is normal for this type of situation to fail.

It would be nice if it could work, but handling self-intersecting objects becomes much more difficult. Generally if a curve or surface folds and intersects itself it will not work properly for operations that involve calculating the intersections between objects.

- Michael

Thx : It that I had supposed but want to be sure :)