"Retsam" <nomail@nomail> wrote in message
news:web.3ecbc05f7e2294662a3ff2e70@news.povray.org...
> 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.
>

I managed to fix this by specifying the varience as 0. Looks fine now.

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