Hi Pilou,

> So what function use? By hand ?

It is possible to do it by hand by creating a curve structure like I showed above.

But actually an easier way I found to do it is explained earlier in the thread here: http://moi3d.com/forum/index.php?webtag=MOI&msg=1939.16

I have a shelled result there that was done by shelling individual surfaces and then booleaning those together, then doing a bit of trimming. That actually comes together really quickly, definitely easier than working at the curve level.

Then the other option is to export to a different CAD program that has a shell function that can handle that situation where there isn't a 1-to-1 matching between the original shape's vertices and the shelled result vertices.

- Michael