Hi Pilou,

> !!!
> Never seen seen that!!!

But yes you have! :) Because didn't you translate the reference for Planar here which describes it and shows an example too? :
http://moi3d.com/2.0/docs/moi_command_reference7_French.htm#planarsrf

:)

But yes, it's a shortcut - if you select an entire surface object instead of selecting curves you can then run Planar and it will find sets of open edges that make planes, then construct the planes there and join them in to seal them off, so it combines a few steps doing it that way.

- Michael