Tom Melly wrote:

> What are the difficulties of implementing, or the disadvantages of having
> some sort of automatic precedence?

I think the problem is that Pov is not aware the the surfaces coincide. 
Due to the limited precision of the calculations, it sometimes 
calculates one of the surfaces to be in front, sometimes the other, so 
there is never any question of which one has precedence.

/Ib

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