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Alain <kua### [at] videotron ca> wrote:
> > Am 10.08.2015 um 09:21 schrieb Anthony D. Baye:
> >> In an effort to speed the render of the scene I'm working on, I
> >> reduced the
> >> radiosity settings to default, but wound up with large patches of pure
> >> white
> >> with jagged edges. I managed to fix some of it by increasing the
> >> number of
> >> pretrace steps, but there are still large ambient areas in the render.
> >>
> >> Can anybody tell me what causes this, and which settings I might
> >> adjust to fix
> >> it? I can't find anything about this in the documents or tutorials.
>
> >
> > *BUT*
> >
> > if your issue is isolated bright splotches, then the main problem is
> > most certainly entirely different, namely that you have some
> > comparatively small but very bright object in your scene. In that case,
> > you only have two viable options: Up your radiosity "count" parameter,
> > or try to replace that bright object with a conventional point or area
> > light source (maybe with a looks_like object).
> >
>
> In this case, using importance can help.
>
> Add:
> #default{radiosity{importance 0.001}}
>
> or
> #declare Average_Count = 75;
> #declare High_Count = 160000;
> #default{radiosity{importance Average_count/High_Count}}
>
> In the radiosity block, set count to a large value:
> count 160000
>
> or
> count High_Count // With declared indentifier
>
> In your small and bright object(s), add this:
> radiosity{importance 1}
>
> That way, on average, you'll use about 160 samples for most of the
> render, but up to 160000 for those problematic small and bright objects.
It sounds useful.
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