Rafal 'Raf256' Maj wrote:

>>recursion_limit 2 brightness 3.0}
> 
> 
> Uhm, I'm afraid ushc settings are totaly psychical incorrect - surfaces 
> diffuse up to x3 times more light then their get.

Remember that Pov-RAY tries not to simulate reality but to produce 
(photo)realistic images. There are many limitations that might cause one 
to use higher brightness than 1. For example, sometimes it is not 
feasible to set the lightsource ambient value more than 1 as it might 
get clipped. Then the only way to get enough illumination is to increase 
brightness value. Megapov's exposure setting might help with this - 
haven't tried it though.

This is all about getting the desired result, not about actual values 
being used. You are seriously limiting yourself by allways using just 
brightness 1 (and fade_power 2 etc.).

> If You would set higher quality (i.e. recursion_limit 5) probably entire 
> scene will be totaly white / overlighted, since walls will recive about
> 3*3*3*3*3 * 1 RGB light

It all depends. Usually increasing the recursion limit beyond a certain 
value doesn't affect the result almost at all. When diffuse 
inter-reflections are calculated, the intensity gets smaller and smaller 
at every iteration (depending on the surface color, diffuse, ambient 
etc. values) and finally has no influence on total radiosity value. I 
think there aren't many "normal" scenes that look practically any 
different with recursion_limit 10 or 20.

Severi

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