> but as you can see in the previous image, it would be a
> tedious work to do here, except if it does a kind of "align"
> like in modo, that is turning all normals in the same way
> for a given surface.

Well yes when you do a Flip in MoI it flips the entire surface including other surfaces that are joined to it all as one piece, then all the polygons generated from that flipped surface will be going in the other direction.

But yes it can be better to use solids rather than messing with flipping but I still don't understand why you can't just turn on double sided lighting and not have to deal with it at all...

Surely there is a setting Modo for you to be able to see double-sided display within the editor window as well.

- Michael