> The other day I was driving up a mountain side and in the trees along the
> road  I could see the morning sun streaking through trees into the light
fog
> that was present.  I thought it was a neat effect.  Also later that day I
> could see sun streaks created by clouds at the horizon as they illuminated
> the dust and thin clouds that were present.  So I was wondering if anyone
> else had seen similar effects and was a sample program available, so I
could
> create these real-world effects in my renderings.


I *love* those two effects you mentioned, they're beautiful. And you
certainly do need scattering media to model them. I don't have any really
good examples for you; just look up "media" and then "scattering" in the
documentation.

It takes lots of practice to get it to look right.

 - Slime
[ http://www.slimeland.com/ ]

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