Skip Talbot wrote:

> 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.

Well, as I said, I just started playing with this method. The thing I like
about it is that it gives you a lot of control over things that happen
incrementally "inside" your composite object. By incrementing and decrementing
features (such as roughness), you can get some interesting effects. I don't
think it's any better than media, overall, just an interesting thought
exercise. The slowness factor, in my case, was a max_trace_level of 100, for
100 nested spheres. I believe the falloff is much sooner than that, and I
probably could have gotten by with a lower trace level. More on this method
when the crayons are finished.

Dave

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