Hi Pilou,

> I must make the intersection first for have a point!

Yes, that's correct - you could either boolean or trim those surfaces to create an edge there, or you could use Construct / Curve / Isect to create intersection curves between them.

It's not really feasible to do an automatic surface/surface intersection for snaps, it is just too slow and processor intensive to attempt to do it between all surfaces automatically. It would make for very slow interaction while you were trying to draw.

- Michael