> I think this is a case of the 'coincident surfaces problem'.
> It suffices to thicken a little the box and the highlights
> are no more visible.


Put the camera inside the box, where obviously no light can reach, and
you'll still see the problem. It is a legitimate bug, although using a flat
box probably wasn't the best way to report it.

Its sister bug is the "shadow line artifact" bug. They're both caused by
similar flaws in the same algorithm.

 - Slime
[ http://www.slimeland.com/ ]

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