Trevor G Quayle wrote:
> Here it is.
> 
>
http://news.povray.org/povray.newusers/thread/%3Cweb.4668123c7fc265f0ff6e04e90@news.povray.org%3E/?ttop=282988&toff=200
> 
> 
> -tgq
> 
> 
Thanks, but I want to keep the spotlight a single source because I'm 
trying to simulate a theatrical lighting instrument as closely as 
possible. The type of fixture I'm modeling after has a ellipsoidal 
reflector at the back of the instrument around a single lamp [bulb], 
lenses in the body tube, and a frame at the front of the tube that 
different colors and diffusion sheets can be placed in.

The whole body and lenses assembly basically focuses the light into 
exactly what at spotlight in povray does (with cosine focus, field angle 
and beam angle, etc), and placing a diffusion sheet in front of the 
lenses makes the whole light spread out more. The only real difference 
between what I'm doing with a 'diffusion sheet' in front of the 
spotlight source and the real instrument is that the real instrument 
isn't completely in focus at that point, while the spotlight source 
always is.

More info:
Light I'm modeling: http://www.etcconnect.com/minisite/sourcefour/index.html
- Note the area at the front that holds a square frame for color or 
diffusion.

Example of diffusion filters: 
http://www.leefiltersusa.com/lighting/products/range/ref:I46C9C14F8BA5B/

I may try to use an area light, but I know the effect can be done with a 
material in the beam itself because I use it in the theater where I work.

-cshake

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