Olivier Tassy wrote:
> Hello,
>
> I have got a strange problem with my 3D objects appearance: several
> parts of the shape seem to miss and these parts are not the same when I
> rotate this object. This is worse when the shape 3d is double sided (see
> picture).

It looks exactly like problem with winding order. Some of your polygons
are facing back. Either correct your geometry (by specyfing all vertices
counter-clockwise looking from outside of model) or set
PolygonAttributes of appearance to CULL_NONE.

Artur

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