ryan constantine wrote:
> 
> how to depict the sun and sky at various times of day. 

I found this: A Practical Analytic Model for Daylight.
The images look just great and I think this model could be merged
into povray (source available). It doesn't model clouds yet but
it's been researched I'm sure.

http://www.cs.utah.edu/vissim/papers/sunsky/

______________________________________________________________________
Kari Kivisalo                                  http://www.kivisalo.net

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