> Adding an inside_vector when not needed can't cause any harm.

That's what I always assumed.

> It only
> add a way to decide if any point is inside a mesh or not.
> The ability of detecting the insideness may, in some particuliar cases,
> cause a mesh to render differently when there are enclosed triangles.

So in the case that the mesh renders differently, that means the mesh 
needs inside_vector to be rendered correctly? Try adding inside_vector 
to the OP's scene, it renders quite differently (the internal faces 
dissappear), so that is why I concluded that inside_vector was needed.

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