> "Bruno Cabasson" <bru### [at] cabassoncom> wrote:
>> Hello again.
>>
>> I revisited the patio_radio scene so as to try to reach perfection. For that
>> purpose, I perform my attempts on high resolution images (1600*1200).
>>
>> For this attempt #1, it still remains :
>>      -) some light areas in some corners
>>         (to the left, on the floor, under the arches)
>>      -) tiny splotchy zones by the arch half-rings,
>>         at the top right of the image
>>
>> The fringe under the balcony seems correct.
>>
>> Render time : 1 hour and 10 mn on a quad xeon @ 3.7GHz.
>>
>> B.
>
> Better with the image ...
>

One thing that I found that improve radiosity is to use the two 
parameters version of count:
count 37 15000

This will use 37 samples from a direction pool if 15000 directions.
It tend to reduce the dark and bright spots in the corners and some 
other artefacts.


Another thing is to reduce pretrace_end. In large renders, pretrace_end 
0.005 or 0.0025 give good results.
If you also use the two parameter for nearest_count, it will reduce the 
pretrace time, possibly considerably.
nearest_count 20 3

The last two are not used if the no_cache option is used as they 
controll how the cached samples are computed.

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