> 2. Seing Tim N's snow macro gave me the idea that I could use a similar
> method to test for placement of rain.........What do you think?

Should be possible. A top-view of a cloud shouldn't be too hard to obtain.
Well... Actually, you could do it much easier. Render a top-view of the
cloud, and use the resulting image as a heightfield, which you place
underneath the cloud. Inside the heightfield you place the media for the
rain. When you tweak the borders of the clouds a little, it should be easy
to obtain an image where only thicker parts of the cloud actually drop rain.

But that's just a little rambling and would probably need refinement...

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

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