This is a section of a scene using almost exclusively radiosity-based lighting,
as rendered by:

(a) POV-ray 3.6.1c using fairly high quality radiosity settings, and a separate
pretrace render with save_file/load_file (i.e. doing pretrace and final render
in separate runs of POV-ray) which I found to smoothen out quite a lot of
artifacts in the picture. The main shot was taken twice the resolution shown
here.

(b) POV-ray 3.6.1c using exactly(!) the same settings as (a), but without using
the save_file/load_file (i.e. pretrace and final render were done in the same
run) and the resolution you see here.

(c) POV-ray 3.7.0.beta.29, using exactly same setup as for (b).

(d) a modified version of POV-ray 3.7.0.beta.29 (my current status for the
radiosity bugfixing work).

The bottom row shows the (somewhat enhanced) difference between the respective
shot and (a) (which I'd expect to come closest to reality).

It seems that 3.6.1c is somewhat closer to the "real thing" in general - but
that for some reasons it gives exceptionally bad results on the left side of
the pedestal's top.

(c) and (d) aren't too much apart - but for some reasons I don't yet understand,
(d) renders a lot faster (factor 3!!!), so it looks like I did *something*
right.

This also shows that 3.6.1 radiosity is far from perfect, and it's probably not
a good idea to take it as a reference after all for the 3.7 development.

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