> 
> Well, that it seems poseray adds a symbolic vector, because <0,0,1> does not
> inside my model in fact. And it shouldn't get such an information because the
> mesh was output from sketchup it does not contain that, moreover most of the
> mesh 3d model does not have a well construct that contain a inside/ outside
> distinction.
> 

It's not a sympolic vector, it's a DIRECTION vector.
To see if ANY point is inside the mesh, POV-Ray shoot a ray from that 
point in the direction of the inside_vector.
With the default vector rovided, the test ray is parallel to the Z axis 
toward +Z.
It's similar to the normal vector of a plane.

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