Nicolas George nous apporta ses lumieres en ce 2007/10/22 07:34:
> "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.
> 
>> 
Beter to use:
#default{finish{ambient 0}} and to override the provided ambient of ready-made 
finishes to ambient 0.

Seting ambient_lights 0 will also turn off any lighting by high ambient object 
you may have.

-- 
Alain
-------------------------------------------------
  "Having a smoking area in a restaurant is like having a peeing area in a pool."
   --Thomas Pfeffer, American Heart Association

Post a reply to this message