From: Andreas Ekstrand (Andreas.Ekstrand++at++saab.se)
Date: 05/26/2000 01:21:29
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.
Anyhow, I tried to make the clipmap virtual to avoid this, and my frame
rate just drops to 1Hz....bummer. What can it be?
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?
/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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>
> --
> 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 | ------------------------------------------------------------
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