> That sounds quite complex. (In particular, it seems to require me to
> actually design a real lens assembly, and implement real refraction.)

Yes I realised that later too, Google didn't seem to throw up any real 
data on proper lens design (for pretty obvious reasons), only very 
simple examples. Still it might be interesting, and you never know if 
you made it slick enough one of the big lens manufacturers may show some 
interest in you or your code.

> I was thinking more along the lines of a camera entity that fires rays
> in a pattern that matches a theoretical ideal lens. But I need to figure
> out the equations for that first...

Look through the POV source? :-)

> Yeah, not just a random number per pixel, but *multiple* random numbers!
> Multiple, statistically-independent numbers... This is not trivial.

Exactly, poor RNGs in these sorts of things can cause some bizarre 
artefacts.

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