Le 2013-02-12 05:10, clipka a écrit :
> 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.
>

OK, case closed.

Next step: go hunting for those missused bounded_by and rewrite the 
scene using intersections, differences and clipped_by.

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