Thx!
See my last little video (in French)
but you can see an interesting method for help the drawing of Hull
with a very cool plug by Michael ;)
Moveslicetopoint : http://moi3d.com/forum/messages.php?webtag=MOI&msg=2749.36

Video : http://moiscript.weebly.com/deacuteplacer-des-objets.html