POV-Ray : Newsgroups : povray.advanced-users : Strange media artefact : Re: Strange media artefact Server Time
20 May 2024 17:01:42 EDT (-0400)
  Re: Strange media artefact  
From: Bald Eagle
Date: 9 Feb 2021 13:40:01
Message: <web.6022d691ca7b7f1f1f9dae300@news.povray.org>
William F Pokorny <ano### [at] anonymousorg> wrote:
> Try:
>   samples 33

That seemed to be sufficient to rectify the issue.  Can't say that sample 65
looks significantly better...

> or perhaps more (with stronger AA tend to need less). The second value
> is not used with method 3. The aa_level (recursion limit) and
> aa_threshold stop method 3.

Even at this "late" stage, I do not have an adequate grasp of antialiasing
settings, so maybe that will be a future area of concentration for me to
investigate, or someone else to post some explanation with illustrative code.

> ---- Details... Suspicions... on my look at it more later list.

Well Gooooooollllllly!
Look at all that there stuff under the hood of POV-Ray that you just emptied out
of your head...   :O

> - When emission was added, a second absorption value spec should have
> been added specifically for it's contribution. Having one value for both
> scattering and emission sometimes just won't work out - and it's harder
> to use even when you can make it work.

Good catch, and that is probably something that needs to be ironed out, or at
least in the short term provided with a little formulaic workaround to tweak the
values accordingly.  Something like the gradient formula for isosurfaces or some
of the lighting formulas in the docs, if that's at all possible.

> ...There is more, and somewhere I have notes. But! I'm going to worry
> about it all some other day and go grab more coffee. :-)

aye,  I should probably take more notes.  Though I already get razzed about the
number of piles of paper with cryptic scribblings...   ;)

Thanks for the info as always   :)

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