POV-Ray : Newsgroups : povray.beta-test : weird white stain with beta povray v3.8.0 (not with povray v3.7.0) : Re: weird white stain with beta povray v3.8.0 (not with povray v3.7.0) Server Time
13 Aug 2022 05:14:57 EDT (-0400)
  Re: weird white stain with beta povray v3.8.0 (not with povray v3.7.0)  
From: Warren
Date: 14 Jan 2022 06:10:00
Message: <web.61e1592fc82cc78e1d602a3e756b296@news.povray.org>
Cousin Ricky <ric### [at] yahoocom> wrote:
> On 2022-01-13 10:06 (-4), Warren wrote:
> > Hi,
> > I post a message here, because I get a weird render with povray 3.8.0 beta 1 of
> > a scene with the following resolution : 1280x960 (see attached image with this
> > message) , you can see a white stain that has the shape of a heart near the
> > pentagram. When I render this same scene with stable v3.7.0 the white stain
> > doesn't appear. And even weird, when I render this scene with povray "3.8.0
> > beta1" but with the resolution of 640x480, I don't get this white stain in the
> > final image.
> What I've found so far:
>  - The artifact varies with the image size.  A 960x720 render leaves an
>    oblong stain on the upper left vertex.
>  - The artifact isn't completely absent with 640x480.  At 640x480, tiny
>    white spots appear along the veins of the pentagram, but they are
>    absent in a 3.7 render.  I presume that this means you did not put
>    them there deliberately, and that they are related to the big heart-
>    shaped stain.
>  - 3.8 beta 2 does not solve the problem.

There are other things to consider:
- First off, set the boolean 'PlaceWell' (line 19 of main pov file) to false, to
get a faster rendering, the heart shape artifact being always there.
- Changing the minimum_reuse value from '0.015' to '0.01' make the 'heart shaped
artifact' to disappear, but the little white stains you talked about are there,
it seems.

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