The idea sounds good... I think you will need to validate whether it is
possible to generate rays for the subdivision in a artifact-free way, and
whether you can generate the rays efficiently during rendering or use some
table.

In particular I think that it is a good idea to use importance more in the
renderer.  You should check out some of the work of Per H Christensen
(search on google) if you haven't already.

Perhaps some ppl who have been around longer can validate / shoot it down
for use in povray, I have not looked at radiosity code.

Andrew

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