POV-Ray : Newsgroups : povray.general : Interference with DF3-files Server Time
18 May 2021 04:51:32 EDT (-0400)
  Interference with DF3-files (Message 1 to 3 of 3)  
From: HKarsten
Subject: Interference with DF3-files
Date: 26 Apr 2021 06:40:00
Message: <web.60869726d7e01209cc54a410ad2d5cff@news.povray.org>
Hi people,
does anybody have an idea how to reduce or even eliminate these interference
when rendering df3-files?

Holger


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From: William F Pokorny
Subject: Re: Interference with DF3-files
Date: 26 Apr 2021 07:34:25
Message: <6086a541$1@news.povray.org>
On 4/26/21 6:34 AM, HKarsten wrote:
> Hi people,
> does anybody have an idea how to reduce or even eliminate these interference
> when rendering df3-files?
> 
> Holger
> 

My first guess would be that you've not included enough buffer voxels at 
zero values at the sides of the df3. There are issues with interpolation 
there. A second guess - with media perhaps not enough initial samples 
(sometimes the adaptive media 3 bit doesn't work properly).

While largely created for a set of proposed df3 changes/enhancements see 
the wiki:

https://wiki.povray.org/content/User:Wfpokorny/DensityFile

The wiki covers too a set of known issues with the density file pattern 
in POV-Ray v3.7 / v3.8.

Bill P.


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From: Alain Martel
Subject: Re: Interference with DF3-files
Date: 26 Apr 2021 11:19:23
Message: <6086d9fb$1@news.povray.org>
> Hi people,
> does anybody have an idea how to reduce or even eliminate these interference
> when rendering df3-files?
> 
> Holger
> 

That looks like the media sampling is missing some part of the pattern.
So, try using more samples.
The default is 10 samples. That may not be enough. If that's emissive 
media, samples 100 is still quite fast.
Increase by steps of 10 until those glitches go away.


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