On 2015-06-30 01:48 PM (-4), clipka wrote:
> Am 30.06.2015 um 19:39 schrieb clipka:
>> I can confirm that this is a bug.
>>
>> In a nutshell, POV-Ray defalts to the wrong noise generator during
>> parsing.
>>
>> The behaviour was broken by commit 35a20c2 (2014-06-13).
>>
>> As a workaround, use "noise_generator 2" in the global settings.
>
> A source file fix for POV-Ray proper is available now in the master
> branch at GitHub.

All I was able to find was a diff readout for 3 files.  Is that all 
there is, or is there a new complete alpha release?  I guess I'm still 
learning my way around GitHub.

I applied those 3 changes to my alpha.8141620 files and recompiled.  The 
new executable confirms that alpha.8150025 is running, but the problem 
remains.  I went back to GitHub to see if I had somehow miscopied the 
changes, but I couldn't find the page again.  (Like I said, I still have 
trouble navigating GitHub.)

The good news is that sometime between 3.7.0.0 and 3.7.1-alpha, another 
bug was fixed: random white splotches in radiosity renders.  I had not 
reported it to date, because I was unable to narrow down the problem to 
create a simplified scene file.  (The attached renders may look simple, 
but they were generated by a render rig with somewhat complex 
internals.)  Thomas de Groot seemed to have a similar problem when 
testing out Scott Boham's SkySim, but I concluded that those anomalies 
were completely unrelated to my problem.

splotches-36.jpg - Rendered by POV-Ray 3.6.1.

splotches-37.jpg - Rendered by POV-Ray 3.7.0.0.  Note the ugly white 
splotches.  When the hills are deleted, there are no splotches.  There 
are circumstances in which the hills are present /without/ splotches, 
but I have been unable to determine a pattern.

splotches-37norad.jpg - Rendered by POV-Ray 3.7.0.0 without radiosity. 
There are no splotches, so they were somehow triggered by radiosity.

splotches-371.jpg - Rendered by POV-Ray 3.7.1.  The hills are different, 
but the white splotches are gone.

splotches-371ng2.jpg - Rendered by POV-Ray 3.7.1 with noise_generator 2 
in global settings.  The hills are back as desired.

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Preview of image 'splotches-36.jpg'

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Preview of image 'splotches-371.jpg'

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