Look also at this, from Jaime Vives Piqueres:
http://www.ignorancia.org:80/uploads/images/raining/wips/townstreet-night-070102-2.jpg

Unfortunately, I believe, he lost the code for this, as stated in the thread 
"lost rain" in p.b.i. (april 19th, 2007)
However he said there that
<quote>
The rain is just
cylinders and tori with tricky textures and repeated randomly. The
splashes are traced against the objects in the scene for placement.
<unquote>

Thomas

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