Thanks,

It's perfectly clear now !
It's really a cool way to do the UV mapping for you ! ;-) Definitely something I'd like to see in MoI as soon as possible. So useful with texturing software that use projection painting, where you don't really need UV "continuity" (like Modo or ZBrush). You virtually don't need to edit your UV map by hand anymore with that option ! Maybe just scale or move some of the parts in the UV space...

Is there any way you can control it in Rhino (for example to force some parts to "stay together" ?)
Would such control be possible in MoI ?

Can't wait for it ! ;-)