Warp wrote:
>   Could you post your radiosity settings?
>   More precisely: What is your error_bound?

Thanks for your interest to help!  :o)  Your suggestion is a surprise.
The settings I've used the most, are:

radiosity { pretrace_start .16 pretrace_end .02
            count 700 nearest_count 5 error_bound .2
            recursion_limit 2 low_error_factor .5 gray_threshold 0
            minimum_reuse 0.015 brightness 1 normal on }

This is with recursion_limit 2, and gives the yellow picture you saw. I
also tried to set the count to 1400, error_bound to 0.1, and
pretrace_end to 0.01 but it just takes very long to render, and looks
just as awful. On the other hand, the settings work nicely with
recursion set to 1. I wonder why.

Hugo

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