> Hmm, I've always assumed that POV throws away any mosaic info without using
> it for any subsequent action (except for radiosity), and that any other
> renderer must do the same.

I would have assumed that the intelligent way to do it would be like below. I
assume it's how Bryce does it.

Say you're doing a 400 x 300. That's 1200 pixels.
First you shoot pixels AS IF it were a 40 x 30, where you choose by some
algorithm 1 pixel out of every block of 100.
Report the color of these pixels to the viewer as if it were ONLY a 40 x 30.
Now assume it's a 160  x 120,  shoot 3 pixels out of every block of ....... and
so on......

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