Elliptical filtering 2005-05-31 - By Bernard Lebel
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Brad: elliptical filtering is necessary to take advantage of the
multi-resolution of the pyramidal map file. Otherwise the maximum
resolution is always the one lookedup by mental ray (thus more
memory).
Alan: I also suspect network issue, although as you said, such a
dramatic increase in render time is quite strange.
Bernard
On 5/31/05, Alan Jones <skyphyr@(protected)> wrote:
> Maybe with that render time a lot of it's reading the files off the
> disk? Pulling the .pic into memory then uncompressing it within memory
> may be signicantly faster. Though I wouldn't expect it to make such a
> huge difference.
>
> That's the only guess that comes to mind though sorry.
>
> Cheers,
>
> Alan.
>
> On 5/31/05, Brad Friedman <xsibrad@(protected)> wrote:
> > This is a question more than an answer:
> >
> > Why convert to pyramid if you're going to use elliptical filtering? I
> > thought the two were entirely different types of filters. Or can
> > elliptical filtering take advantage of a pyramid texture?
> >
> > -brad
> >
> > Bernard Lebel wrote:
> >
> > > Hi,
> > >
> > > I am baffled at something. I have a scene with rather large textures
> > > (3500x3500 and higher). In Pic format, it renders in 45 seconds.
> > >
> > > So I'm looking to save render time, and memory while we're at it, so I
> > > convert textures to pyramidal map float files (imf_copy -p [...] map
> > > rgba_fp).
> > > Then I turn on elliptical filtering, set the Maximum Pixels for
> > > Minimum Radius to a low value 1.3, because higher than that is
> > > generally not necessary.
> > >
> > > In the past, I got much faster render times. However right now the
> > > render time explodes: it's at least 5 times longer than with the Pic
> > > version.
> > >
> > > Any idea?
> > >
> > >
> > > Thanks
> > > Bernard
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