Thanks for those. The low_error_factor was the one that shows the best 
improvement.
If I throw everything at it the dithering goes away, although the render 
time is rather long at 21 min/frame.

Here are my "Everything" settings:

     radiosity {
     pretrace_start 0.04
     pretrace_end 0.00125
     minimum_reuse 0.001
     count 700 25000
     recursion_limit 2
     nearest_count 20, 7
     error_bound 0.44
     low_error_factor 0.05
     }



On 06/02/2023 10:22 PM, Alain Martel wrote:
> Le 2023-02-06 à 02:41, m@b a écrit :
>> This helped, the blotchiness is acceptable for a still image but still 
>> jumpy in animation.
>>
>> Raising the 'scope - yes, good point.
>>
> 
> Try those one by one :
> Slightly increasing error_bound (this will make the rendering go a 
> little bit faster)
> (your actual value is 0.35)
> error_bound 0.37
> error_bound 0.4
> error_bound 0.44
> 
> Increase count
> count 450 12347
> count 700 25000
> nearest_count 20 7
> 
> Set minimum_reuse slightly smaller than pretrace_end such as :
> (default is minimum_reuse 0.015 for a default pretrace_end of 0.04)
> pretrace_end 0.0025
> minimum_reuse 0.002
> 
> pretrace_end 0.00125
> minimum_reuse 0.001
> 
> Set low_error_factor to a smaller value (default is 0.5)
> low_error_factor 0.3
> low_error_factor 0.1
> 
>

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Attachments:
Download 'everything.mp4.dat' (54 KB) Download 'low_error_factor 0.05 .mp4.dat' (54 KB) Download 'low_error_factor 0.1 .mp4.dat' (54 KB) Download 'low_error_factor 0.3.mp4.dat' (54 KB) Download 'pretrace_end 0.00125 .mp4.dat' (56 KB) Download 'pretrace_end 0.0025.mp4.dat' (55 KB) Download 'count 700 25000 nearest 20 7.mp4.dat' (54 KB) Download 'count 450 12347.mp4.dat' (55 KB) Download 'error_bound 0.4.mp4.dat' (55 KB) Download 'error_bound 0.37.mp4.dat' (55 KB)