David Given <dg### [at] cowlarkcom> wrote:
> On 15/01/10 21:01, Alain wrote:
> > Le 2010-01-15 15:43, Nekar Xenos a écrit :
> [...]
> >> media
> >> {
> >> method 3 // adaptive
> >> aa_threshold 0.1 aa_level 3
> >> intervals 3
> >> samples 20
> >> jitter .1
> >> scattering
> >> { ...
> [...]
> > media{
> >     samples 60
> >     jitter 0.1
> >     scattering{...}
> >     }
>
> Thank-you, but alas, neither of those work! In fact, they both render
> identically, taking the same amount of time. (And I did check to make
> sure that I was modifying the right bit of the right file...) I even
> tried going as far as samples 1000 and jitter 0.01 but that had no
> effect either. Even changing the sampling method produces images that
> are *pixel identical* with the original. (Changing the media type from
> scattering to emission produces glowing clouds with the same artifacts
> in them in precisely the same place.)
>
> Any ideas?
>
> Incidentally, what is jitter, and is it safe to use in media when doing
> an animation? (The documentation on media sampling mentions jitter in
> passing but doesn't say what it does or what the parameter is. I'm
> finding this to be a common theme in the Povray docs, unfortunately.)
>
> --
> ┌─── ｄｇ＠ｃｏｗｌａｒｋ．ｃｏｍ ─────
http://www.cowlark.com ─────
> │ "There does not now, nor will there ever, exist a programming
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> │ Flon's Axiom


Those are artifacts caused by too few samples.  Are you absolutely certain that
you did modify the right part of the file?  Because settings samples to 1000
would be extremely slow.  I would expect a samples setting of 100 to be more
than enough.
  Can you post more related code and the version you are using?  I have a
suspicion involving the use of more than one media per object (sometimes the
value specified for samples gets reused inappropriately).



-Reactor

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