I have tried using media but did not get very good results. I found it
difficult to stop the media touching the edge of the object it was contained
in thus producing artifacts that looked very unsightly. Any tips in this
direction would be greatly received.

Dave



"Warp" <war### [at] tagpovrayorg> wrote in message
news:3abca8b1@news.povray.org...
> Christoph Hormann <chr### [at] gmxde> wrote:
> : 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.
>
>   My experiences show that media (method 3) is faster than using stacked
> planes.
>   Media (method 3) is optimized, so no too many samples are taken. With
> a stack of planes povray always have to calculate rays through all the
> planes, no matter if the resulting color is inexistent.
>
>   Also media can be looked closely while the planes can't.
>
> --
> char*i="b[7FK@`3NB6>B:b3O6>:B:b3O6><`3:;8:6f733:>::b?7B>:>^B>C73;S1";
> main(_,c,m){for(m=32;c=*i++-49;c&m?puts(""):m)for(_=(
> c/4)&7;putchar(m),_--?m:(_=(1<<(c&3))-1,(m^=3)&3););}    /*- Warp -*/

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