Re: Coplanar polygon flicker...

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Rob Jenkins (robj++at++quid)
Fri, 20 Dec 1996 15:40:54 -0800

Russ

RELNOTES FOR IRIX 6.2: Performer_eoe Known Problems and Workarounds say:

o Coplanar polygons: pfDecal works only on machines that
            support the stencil or displacepolygon command. The
            default decaling mode for PFDECAL_BASE uses
            displacepolygon instead of stencil. This can
            significantly improve rendering performance but can
            result in visual anomalies where layer polygons
            incorrectly "poke" through other geometry. If you wish
            to use stencil then specify the
            PFDECAL_BASE_HIGH_QUALITY token.

Also you may find reducing the ratio of your near:far clipping planes may help
( get you more Zbuffer resolution as you move towards horizon ).

Cheers
Rob

On Dec 20, 2:04pm, Russell Suter wrote:
> Subject: Coplanar polygon flicker...
> Hey once again,
>
> I know I've seen something on this but I can't seem to find it. I have a
> Multigen database which has coplanar polygons that flicker when I run with
> my new Performer 2.1 application linked with the OpenGL libraries. It
doesn't
> flicker when I use my old Performer 1.2 version with IrixGL. I seem to
> recall somewhere that this was something easily fixed. Any help refreshing
> my feeble memory would be greatly appreciated.
>
> Thanks in advance.
>
>
> --
> Russ
> ________________________________________________
______________________________
> Though my eyes could see | Russell Suter
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>-- End of excerpt from Russell Suter

-- 
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Rob Jenkins mailto:robj++at++csd.sgi.com
Silicon Graphics, Mtn View, California, USA
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