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Ben Chambers wrote:
>
> "Xplo Eristotle" <inq### [at] unforgettable com> wrote in message
> news:3BA7654F.D3428246@unforgettable.com...
> > I was playing with AA settings today and it occurred to me that while
> > high-contrast areas need a high adaptive sampling setting to achieve a
> > really smooth-looking edge, areas with less contrast can get by with
> > quick and dirty sampling. To some extent, this is provided for by the AA
> > threshold.. but could AA further be optimized by adjusting the sampling
> > according to contrast? For instance, the user could specify adaptive 3
> > or 4 down to threshold .3, then adaptive 2 down to threshold .1 or so,
> > and adaptive 1 below that...
> >
> > At present I have no idea what the interface for this would look like,
> > or if it would have a significant effect on render times.. I just wanted
> > to get the idea out and see what people thought.
> >
> > -Xplo
>
> AA already has adaptive sampling, ie, it is used only when the contrast is
> high enough (see section 5.2.6.5). To summarize, type 1 only uses AA if it
> is needed and type 2 not only uses AA but subdivides the image recursively
> if there is still a large contrast. So, if an area has a little bit of
> contrast, it will only subdivide once (if at all). If a lot of contrast is
> present, POV-Ray will not only subdivide further, but only subdivide those
> areas where the contrast exists.
That's not quite how I remember it working, and performance seems to
support what I remember, but my memory is imperfect. I suppose I'll have
to look at the docs again.
If I've inadvertently suggested a feature identical to what we already
have, forgive me ^^;;
-Xplo
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