Dave B wrote:
> 
> I have been trying for quite a while to produce some very realistic
> procedural clouds. I can get the textures and colouring very close to
> realistic but they never look quite right. I have tried mapping the textures
> on to both sky spheres and planes with various sizes and distances but they
> always seem too flat. Can anybody give me a little advice on how to give
> them some depth.
> 

For realistic volumetric clouds you could use media, but that is quite
slow.  A common method is to use a stack of planes of different height /
spheres of different radius with partly transparent textures.  Vahur
Krouverk has made some experiments with Povman shaders for this purpose
recently:

Subject: Procedural clouds
Date: Wed, 14 Mar 2001 20:57:22 +0200
From: Vahur Krouverk <vah### [at] aetecee>
Newsgroups: povray.binaries.images

Just look through the older postings in povray.binaries.images and the
scene-file groups and you will find quite a lot of possibilities.

Christoph

-- 
Christoph Hormann <chr### [at] gmxde>
IsoWood include, radiosity tutorial, TransSkin and other 
things on: http://www.schunter.etc.tu-bs.de/~chris/

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