Hughes, B. wrote:
>Do you have a image to show the graininess? A crop of the particular part
>would suffice. Post it to the povray.binaries.images group if you do,
>please. I get acceptable results using default confidence and variance at
>100 samples. Perhaps yours is a specific circumstance or large rendering?
>The problem wouldn't seem to be the camera's aspect ratio, at least.
>

Yes, post a sample image.  But from the sounds of this, I ran into this same
problem three or four years ago with focal blur in POV 3.1.  The problem is
the adc_bailout.  What this does is says that if after so many samples, a
new sample probably (or can't) change the color by more than such an
amount, then stop tracing rays.

The even bigger problem is that adc_bailout had a bug that basically resets
it to the default 1/255.0 every time you render an image.  I finally
reported the bug a couple months ago, and it's patched in 3.51, but I don't
know if there's a binary patch yet.  However, if you have the source code, I
can help you make the changes necessary to make the adc_bailout work.  Just
set it to 0, and artifacts like this should disappear (assuming that's what
you ran into).

Another option is to post the source in povray.text.scene-files, and I can
render it with my "fixed" version to verify if that is indeed the problem.

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