news:41fe4f7e@news.povray.org...
>   Ah, I didn't notice that "media" part in the original question.
:-)
>
>   The "solidness" of an object (which in the case of meshes is achieved
> with interior_vector) is needed *only* for CSG, nothing else.
>   Not even media, which is "inside" the object requires for the object
> to be "solid". Media works just ok for any closed surface regardless of
> whether it is "solid" or not.
>
>   Many people have the misconception that interior_vector is needed
> for media to work with meshes. Perhaps I should write an entry to
> the povQ&T about this.
>
I think so... BTW I never got that inside_vector idea... is it coordinates
of a point inside the mesh?

Marc

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