This has tripped me up, but I believe that the image of the mirror ball, and the
megapov "maptype 7" mapping are different. Paul Debevec explains it on
steradians. Also note that the mapping being used is different than the mapping
one observes in a mirrored ball -- the mapping we're using avoids the problems
of poor sampling near the backwards-facing directions around the circumference
of the image."
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