BTW if you want hi Q stacked clouds , you need a lot of planes and it
becomes slower and slower
Marc

3d2c9a21$1@news.povray.org...
> I tried doing this myself a few weeks ago and the results using concentric
> spheres were significantly slower then media.  I thought this was a
similar
> technique to the stacked-planes-clouds which are remarkably faster then
> scattering media clouds.  I must be mistaken somewhere.
>
> Skip
>
>

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