One possibility would be to rewrite the whole radiosity code from scratch.
Read the original paper by Greg Ward about the subject, and if possible,
study how Radiance does it "properly", and learn from that before the
rewrite.

  Of course this is a huge amount of work, and it would be perfectly
understandable if nobody would be ready to do it. (There might also be
some minor surprising issues, eg. something intrinsic in POV-Ray not being
completely compatible, for whatever reason, with Ward's algorithm, or
something else.)

  Radiance is a proof that the algorithm can be made to work well. It's just
a question of somebody doing it... :/

-- 
                                                          - Warp

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