Severi Salminen wrote:

> Yeah, Pov uses the exact same method. It is very simple and fast method.
> Pov also has one additional check, which I'm not sure is worth it. POV
> also returns both hits always. I only return the hit in front of the
> ray. I have no use for the other.

It's used for CSG. (E.g., if you "difference" the sphere against 
something else, the "back" intersection might actually be where the 
solid surface begins.)

[Mutters something about Haskell and lazy evaluation...]

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