Hi!

I've experimented a little bit with procedural clouds (written with
shader) and here is most promising result. Basically it is one plane
with shader. Shader is quite messy right now, but basically it performs
marching from intersection point toward light source and uses "advanced
calculation" to calculate cloud's color. So the shadowing of clouds is
totally fake, but with little  more tinkering it could be possible to
make this fake quite believable. But right now every attempt leads to
worse output, so I have to take time off.
Good part of such approach is that it renders quite fast: 512x384 aa0.3
on 2m28sec (350 MHz P2)

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