If your snowline is essentially at a set altitude, then you should be able
to get away with a texture map based around the planar pattern with
turbulence. If you want something a bit more terrain dependant you could
take a look at my question from today (10/1/2000) in povray.binary.images
and Bill D's excellent solution and illustrated answer. I think the message
header is "hf question/help - melly".

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