Here is the version with IOR/Ice between the bright snow and the dirty slush.
Not worth the render time. That one area of checker has been there since 7h past
day one initiation of render.

It says 17ppm, but I think its lying.

By that metric, it should have been done long ago. Hah.

Anyway, the macro for the previous image has parameters which allow for
increased variance of the texture.

I'll release these macros before the main coating algorithm, and again with it
in 7z format.

Ian

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