Hi all!

I'm learning how to use radiosity, so I've made a small image based on the
classic Cornell Box (see below)

I've used rather high quality settings (I think), roughly based on
Radiosity_OutdoorHQ in rad_def.inc . The render took more than 24h on my
poor 750 MHz PC and though, I think there are still some radiosity artifacts
on the image (especially between the toruses; also some kind of grainy
effect).

 I read the Povray docs several times, but I have a lot of difficulty
understanding how radiosity works precisely, in relation with the various
parameters. Could anybody help me find which parameter to tune to get a
better quality?

Luminous cylinders are ambient 2.8 diffuse 0

Walls are ambient 0 diffuse 0.98

Radiosity settings are:
{
    brightness       1.0
    count            500
    error_bound      0.1
    gray_threshold   0.0
    low_error_factor 0.5
    minimum_reuse    0.015
    nearest_count    7
    recursion_limit  3
    adc_bailout      0.0035
    max_sample       -1.0
    media            on
    normal           on
    always_sample    1
    pretrace_start   0.08
    pretrace_end     0.004
}

Thanks in advance!

Xavier

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