Am 12.02.2013 03:23, schrieb Alain:

> An image is posted on p.b.images

Fits exactly with what I'd expect from the shadow caching mechanism. I 
didn't check, but you'll probably find that the "steps" in the shadow 
perfectly align with the render block grid. You'll probably also find 
that using "+WT1" will significantly change the pattern. You might also 
check what happens if you use a bit of transparency on the object; the 
"steps" should disappear in that case, because non-opaque objects don't 
take part in shadow caching.

Once again: This is not a bug, but the side effect of a misused feature.

And to cut this discussion short: It will /not/ be worked around in the 
POV-Ray code, because that would require breaking or at least degrading 
one or two performance optimization mechanisms.

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