From: Angus Dorbie (dorbie++at++sgi.com)
Date: 05/26/2000 02:19:23
Andreas Ekstrand wrote:
>
> Yes, I'm seeing jello effects. At least I think they are jello effects.
> And they are worse in a 3-pipe application (Onyx, 8 R10000, 1Gb, IR,
> IRIX 6.5.6, Performer 2.2.7) than in a 0.5-pipe (Onyx2, 2 R10000, 2Gb,
> IR2, IRIX 6.5.7, Performer 2.2.7). I will try grabbing a screenshot of
> the phenomenon to see if it's actually jello.
>
Send the shot to me not the list please.
> Anyhow, I tried to make the clipmap virtual to avoid this, and my frame
> rate just drops to 1Hz....bummer. What can it be?
We've done this already. See my earlier response.
>
> By the way - if I succeed - setting the num effective levels to less
> than
> 16 and then adjusting the offset in realtime should get rid of jello
> effects,
> right? Or would I have to increase the clipmap levels beyond 16?
>
Yes to the first part and I've already explained that this is a control
for large cliptextures so you have to increase the levels in the clipmap
to greater than 16 to go virtual. So the clip texture must have greater
than 16 levels and the number of effective levels must be less than 16.
> /Andreas
>
> Angus Dorbie wrote:
> >
> > I'm not sure why this should be, but this is invalid. The offset and
> > number of effective levels are controls for manipulating the virtual
> > clip stack within the larger clip stack. Basically you choose which 16
> > levels (or less using num effective levels) you need when drawing a
> > given set of geometry. So if you want to use these controls you need to
> > use a larger cliptexture (that can be faked).
> >
> > You shouldn't need to adjust num effective levels with a non virtual
> > cliptexture. Are you seeing jello effects or were you just
> > experimenting?
> >
> > Cheers,Angus.
> >
> > Andreas Ekstrand wrote:
> > >
> > > pfHi!
> > >
> > > How come I get a framerate of approximately 1Hz (instead of 60Hz) when I
> > > try to reduce the number of effective levels in my 16-level
> > > (32768x32768) clipmap? Doing pfMPClipTextureNumEffectiveLevels in the
> > > code or specifying effective_levels in the ct-file with any number less
> > > than 16 results in this strange behaviour.
> > >
> > > I'd appreciate any suggestions, comments or solutions.
> > >
> > > pfThanks,
> > > Andreas Ekstrand
> > >
> > > --
> > > ------------------------------------------------------------
> > > Andreas Ekstrand, FGA-AE |E-mail: Andreas.Ekstrand++at++saab.se
> > > Saab AB - Simulation Center|Phone: +46 (0)13 - 18 40 42
> > > SE-581 88 Linkoping |Fax: +46 (0)13 - 18 41 77
> > > SWEDEN |
> > > ------------------------------------------------------------
> > > -----------------------------------------------------------------------
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> > > Submissions: info-performer++at++sgi.com
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> >
> > --
> > For Performer+OpenGL tutorials http://www.dorbie.com/
> >
> > "In the middle of difficulty lies opportunity."
> > --Albert Einstein
>
> --
> ------------------------------------------------------------
> Andreas Ekstrand, FGA-AE |E-mail: Andreas.Ekstrand++at++saab.se
> Saab AB - Simulation Center|Phone: +46 (0)13 - 18 40 42
> SE-581 88 Linkoping |Fax: +46 (0)13 - 18 41 77
> SWEDEN |
> ------------------------------------------------------------
> -----------------------------------------------------------------------
> List Archives, FAQ, FTP: http://www.sgi.com/software/performer/
> Submissions: info-performer++at++sgi.com
> Admin. requests: info-performer-request++at++sgi.com
-- For Performer+OpenGL tutorials http://www.dorbie.com/"In the middle of difficulty lies opportunity." --Albert Einstein
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