> This macro is excellent.

Thank you! High praise... :-)

> I can see it being used for more than just snow. I
> think an interesting use for it would be moss growing on the side of a
> tree.

Yeah, great idea. I guess this surface covering can be used for lots of
different effects (e.g. dust). IIRC someone created a subsurface-scattering
simulation using blobs and image_patterns. The speed-up due to the
pretesting and dividing the area into active and inactive cells should be
worthwhile for lots of these kind of effects.

Regards,
Tim

-- 
"Tim Nikias v2.0"
Homepage: <http://www.nolights.de>

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