POV-Ray : Newsgroups : povray.general : weird effect or normal : Re: weird effect or normal Server Time
14 Apr 2024 12:42:32 EDT (-0400)
  Re: weird effect or normal  
From: Alain Martel
Date: 17 Mar 2024 12:38:20
Message: <65f71c7c$1@news.povray.org>
Le 2024-03-17 à 01:41, Ilya Razmanov a écrit :
> On 16.03.2024 19:06, David Kraics wrote:
> 
>> I don't know what that does or is. Honestly, even after 30 or so years 
>> of using
>> this program, I only know how to use some of its features.
> 
> As it was explained already, it controls the number of light/surface 
> interactions for a ray. Most of my scene files, especially 
> auto-generated, start with:
> 
> global_settings
> {
>    max_trace_level 3
>    adc_bailout 0.01
>    assumed_gamma 1.0
> }
> 
Instead of reducing max_trace_level, it's often better to increase 
adc_bailout.

When max_trace_level is reached, black is returned.
When the tracing stop due to adc_bailour, you get the current 
evaluation, not black.
In your case, you probably won't see a speed degradation using a larger 
max_trace_level. No change expected going from a value of 4 to to 50 or 
more, as sdc_bailout would kick in pretty early.

The default adc_bailout is 1/256. Your 0.01, or 1/100, is better for 
your situation. You may even use something like
adc_bailout 0.03
Without issue. It may make your rendering go a little bit faster.
I very often increase adc_bailout for test renders.


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