In article <web.3ddd4c7254c2b915a0c272b50@news.povray.org>,
 "gonzo" <rgo### [at] lansetcom> wrote:

> I just did this in a scene I'm working on and it seemed to work fine. I had
> a background that I wanted to illuminate with a colored light, but didn't
> want the colored light or background to influence the radiosity, so I made
> the light & background a light_group with global lights turned off, and it
> seems to do exactly what I wanted.

An object isn't a light though...this is the right way to make sure the 
light only directly illuminates the backdrop, but it shouldn't have any 
effect on radiosity. I suspect it just doesn't show a visible effect in 
your scene.

Again, this kind of camera-aligned backdrop is useless for any kind of 
realistic effect. The background should give a radiosity effect, and 
should show up in reflections or refractions, so it needs to surround 
the whole scene. You might be able to use a sky_sphere with the same 
general color of the backdrop, and a random pattern that will look "good 
enough" in reflections. Then the radiosity of the real backdrop won't 
matter much, and the lighting of the scene will be closer to correct.

-- 
Christopher James Huff <cja### [at] earthlinknet>
http://home.earthlink.net/~cjameshuff/
POV-Ray TAG: chr### [at] tagpovrayorg
http://tag.povray.org/

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