"Bill Pragnell"  wrote in message
<web.471c85bad8eb8586731f01d10@news.povray.org>:
> However, you can adjust gray_threshold in the radiosity settings. This
> specifies how much colour to include in the radiosity calculations (1 = no
> colours, 0 = full colour radiosity).

Thanks, that does exactly what I was hoping.

>					Obviously, if you get rid of the sky
> colour you will also lose colours emitted from nearby objects, so you can't
> have it both ways I'm afraid!

That is ok for me in that particular scene.

As a more theoretical question, would it be possible, with the radiosity
algorithm, to have different gray_threshold for each object?

> One more point - it's best to set all objects' ambient to 0, otherwise they
> actively emit light in radiosity calculations.

Is it enough to set the global_settings ambient_light to 0, or is it
necessary to add a finish { ambient 0 } to each object in the scene.

>						 If you have the global
> ambient=3 then your scene must be really, really bright :)

Indeed. I use radiosity OR global ambient, not both.

Thanks for your help.

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