I'm going from memory here but I recall that with elliptical filtering
render times can vary wildly dependant upon the amound of compression of the
visible image in screen space. I seem to remember that, for example, on
landscapes the render time would go through the roof toward the horizon of a
textured landmass.
kim(at)cg-soup.com
kim(at)aldis.org.uk
> -----Original Message-----
> From: owner-xsi(at)Softimage.COM
> [mailto:owner-xsi(at)Softimage.COM] On Behalf Of Bernard Lebel
> Sent: 31 May 2005 22:09
> To: XSI(at)Softimage.COM
> Subject: Re: Elliptical filtering
>
> 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(at)gmail.com> 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(at)fie.us> 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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