I read the manual about interior texture. It says that it can be apply 
to triangle (and I assume mesh and mesh2) but I did not find (with a 
grep) the definition of backside and frontside for triangles, mesh and 
mesh2 ?

Moreover, the definition seems to differ from OpenGL's (order of 
vertices) and seems not to use normals either when they are given so I 
can not guess it !

Please help.

Thanks

Christophe Raffalli

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