So, I wasted half the day doing ridiculous things with cross products, dot
products, and rotating graphs of scattering functions.

Then I just decided to experiment with faking it from scratch.

After wrestling with the aoi and slope patterns, I got something that more or
less works as a basic concept.

I have no real idea what I'm doing with the filter and transmit values, and I
can't achieve any transparency no matter what values I use.

Anyway, here's a quick animation I threw together to adequately show how it
works.

It's just "one" texture and 2 light sources to provide adequate illumination of
both sides.

- BE

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Attachments:
Download 'wetpaper.mp4.dat' (1595 KB)