clipka <ano### [at] anonymousorg> wrote:
> Am 04.02.2011 09:21, schrieb Bruno Cabasson:
> > Here is a radiosity-only scene derived from the shipped-in radiosity3. In order
> > to get a smooth lighting, I had to use quite 'extreme' values ...
>
> Looks good.
>
> I presume you're using POV-Ray 3.7; did you make use of the "importance"
> radiosity setting?


No, not yet. I'll try this asap.

It was rendered with the lastest 3.7 RC3.

For this render, I first had only the yellow ring and set the dome color to
black so that the scene was only lit by the yellow ring, and tweaked parameters
until I had good behaviour in corners, on the floor 'far' from the ring, as well
as under the 'flying saucer'.

Then I added the red bar and the big blue ring and set the dome color to rgb
0.01.

I might look excessive, but in order to have this smooth result I had to use
this radiosity block:

    radiosity
    {
        pretrace_start 32/image_width
        pretrace_end   2/image_width
        count 6400 // 3200 not enough (few splothes far fom the ring) ...
        nearest_count 20
        error_bound 0.1
        recursion_limit 2
        low_error_factor 1
        gray_threshold 0.0
        minimum_reuse 0.02
        brightness 1
    }

It was also for me the occasion to see the inluence of 'pretrace_end' (great
influence on the accuracy of the shadow of the 'flying saucer'), in addition to
'count' and  'error_bound'.

I'll keep you informed.

Bruno

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