Alain <kua### [at] videotronca> wrote:

> > "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.

For both attempts, I used pretrace_end = 1/image_witdh in order to have pixel
acurracy. I don't know if it is relevant, but I noticed better results for small
details in scenes.

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