Am 12.03.2019 um 00:43 schrieb Bald Eagle:
> But the problem is that POV-Ray is trying to numerically compare the distance of
> two surfaces from the camera, and it doesn't know which surface is _supposed to_
> be in front.
Nah, that's just the easiest category of coincident surface problems.
Sometimes one surface will win, sometimes the other, and you'll probably
get a speckled surface. With high enough anti-aliasing settings, you may
even get a neat averaged colour.
That's boring. The real coincident surface problems only start after that.
Because then POV-Ray has to shoot secondary rays (for shadow tests, or
reflections and/or refractions depending on material), and decide
whether or not to consider that other surface for this purpose: Is it
/genuinely/ coincident or just extremely close?
That's where the true can of worms is opened.
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