> The scene code is on the povcomp site for all to use:

sky_sphere ...

The radiosity engine only uses rays that travel finite
distances, sky_sphere and background are both an
infinite distance.  When a radiosity ray "leaks" thru
a seam, and then goes infinite, that ray is considered
pure black, which affects previous bounces of the
ray, coloring them black as well. Higher quality
settings means there are more rays to leak thru.

You should use a large inverted sphere for sky
in radiosity scenes, that way there will be no infinite
rays at all. That should reduce the artifacts.

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