Jaime Vives Piqueres posted an interesting radiosity test scene in
p.b.images, where he basically improved the quality of the radiosity
calculations by rendering the same image many times, each time
decrementing the error_bound, and saving/loading the radiosity data
to a file for the next render. The quality of the radiosity lighting
got very significantly improved this way, with a surprisingly moderate
overall render time.

  Given how much this technique improves the quality of the lighting
I think it should be seriously considered to be studied further and
implemented as an internal feature of POV-Ray, so that POV-Ray can be
made to do this automatically, without the need for the save files nor
setting animation rendering manually.

-- 
                                                          - Warp

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