Wasn't it Robert A. who wrote:
>Hi,
>
>Is it possible to have a surface rendered as a pure color unaffected by 
>light but with shadows ? Kind of like the background color but with shadows.
>
>So if I had a plane set to color <1.0, 0.0, 0.0> it will be RGB(255, 0, 0) 
>everywhere except where there is shadow. I'm making 2D images of GUI 
>controls so this would be very useful, especially in creating the alpha 
>mask.

When I create my alpha shadow masks, I use an extremely bright light
source. 

http://www.econym.demon.co.uk/shadowtut/index.htm

-- 
Mike Williams
Gentleman of Leisure

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