Chambers  wrote in message <462ba23c@news.povray.org>:
>> Neither solution are satisfactory. For a long time, I think that PoV is
>> missing a way to cleanly deal with coincident surface: some declaration in
>> the scene that says "these surfaces are *meant* to be coincident, you must
>> handle them that way"
> But how would it handle which texture to process first?

That is exactly the point: we need a way to tell PoV what to do.

 From a theoretical point of view, it is quite trivial: if two objects use
the same surface, PoV computes only once the intersection, applies the
user-given rules to determine which one comes first, and keeps a flags for
any light ray it must then follow from this point.

 From a practical point of view, devising a syntax for that would require to
example all possibilities, but it can be done.

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