POV-Ray : Newsgroups : povray.binaries.images : Strange light behaviour : Re: Strange light behaviour Server Time
8 Aug 2024 06:19:06 EDT (-0400)
  Re: Strange light behaviour  
From: bp
Date: 6 Sep 2005 01:54:41
Message: <431D2F15.3090009@rsp.com.au>
also, it's possible that scene ambience + object ambience maybe adding 
unwanted energy to the scene (especially at the corners of the room)
benp

Xplo Eristotle wrote:
> Rick Measham wrote:
> 
>>         radiosity {
>>             pretrace_start 0.08
>>             pretrace_end   0.04
>>             count 85
>>
>>             nearest_count 5
>>             error_bound 1.8
>>             recursion_limit 12
>>
>>             low_error_factor 0.5
>>             gray_threshold 0.0
>>             minimum_reuse 0.015
>>             brightness 1.2
>>
>>             adc_bailout 0.01/2
>>         }
> 
> 
> I didn't see your post in .general, but...
> 
> Holy crap!
> 
> recursion_limit 1 is enough for scenes with a lot of ambient light 
> (skylight, lots of artificial lighting, etc). 2 will do for most scenes 
> with less light and lots of shadows, and you should only go to 3 if 
> you're trying to bounce light around a few corners or you're doing a 
> fancy final render of a scene that normally gets 2. Beyond 3, the 
> differences are usually imperceptible.
> 
> The more you increase the recursion, generally speaking, the more 
> inaccurate and artifacted your radiosity gets. I don't know that this is 
> the problem, but try cutting that 12 down to 2.
> 
> Also, you really ought to decrease that error_bound. .3 or less will 
> resolve small shadow details, but tends to be pretty slow and needs a 
> higher count for smooth results; .5 - 1 will do for an approximation of 
> realistic lighting.
> 
> -Xplo


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