Ok, thanks for the link and for you answer Michael.

BTW a simple trick for those who need to show their own 3D stuff in 3D mode :
if we need just to show some 3D modeled without showing *all* what we modeled, think we can export to SketchUp then use the SU "animation/scenes" function to make a video-show...

Hoping this will help a bit,
Cordially,
Guy