> You can say take an another Poly prog for make that,
> but seems that Moi Smooth Phong is very "complex"
> and the other poly progs have many difficulties for manage this problem !

Hi Pilou - I think that what you are talking about here is that MoI exports nice smoothing information in a form called "vertex normals". These normals are very accurate since they come from the original NURBS surface.

It sounds like in Steph's polygon program (Cinema4D??) , flipping the direction of a mesh causes it to throw away existing vertex normals and calculate new ones - this is bad because the normals calculated "from scratch" in a polygon modeler come from just averaging adjacent polygon faces. This is not as accurate as the original normals and can cause shading defects.

Has Steph reported this problem to the makers of his polygon program? The authors of that program should improve the way they flip objects - instead of discarding the good normals they should just flip those normals to the other direction.

It is not really a difficult problem to solve at all, it is actually a very simple procedure, each normal should just get multiplied by -1.0.

- Michael