Carl wrote:

> I'm getting a result I didn't expect and don't understand.  I have a light
> source inside some media and I get this effect.
> 
> http://www.wwwmwww.com/TRON/tanktest3.jpg
> 
> I change the light source to a spot light and I get this.
> 
> http://www.wwwmwww.com/TRON/tanktest2.jpg
> 
> Why is the interaction of the light and the media no longer uniform?  It
> looks like an error similar to a coincident surface.  For that mater even
> when a normal light source is used the media doesn't look that uniform.
> Only at the other edge does it really look right to me.  Can some that
> knows more about spot lights and or media tell me what I'm doing wrong?
> 
> Thanks,
> Carl

A couple questions:

1) Are you sure the light source is not coincident with a surface? This 
can also cause problems.

2) Are you using radiosity?


-- 
~Mike

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