Tim, forgive my butting in, but I have to know something. Right away when I 
saw your snow macro I was struck with an image of water vapor building up on 
the wing of my plane as I waited to be refueled. Planes are curvy, so it 
beads up until enough amasses in one area and then a drip forms. I stare at 
these things all the time, because not only do I study hydrology in 
reforming land areas (civil work) but I also play with Pov-Ray. So, I was 
putting your approach with snow together with water and thinking... just 
d*mn! Heh.

Have you tried that out yet?

- Grim

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