Re: [info-performer] help about performer flickering problem

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From: Brian Furtaw (brian++at++sgi.com)
Date: 05/28/2003 06:54:20

TO fix this you could create pre and post draw callbacks for the objects
decaled onto the runway then make use of the OpenGL polygon offset
extension. Polygon offset will keep the decaled objects from Z fighting.

Brian

Bo Sun wrote:
> hi:
>
> I am stuck in the following problem:
>
> We have one SGI Reality engine, which installed two
> versions of irix.
>
> 1) with irix 6.2, performer 2.0 is installed;
> 2) with irix 6.5, performer 2.2 is installed.
>
> We have a set of code which is developed under irix
> 6.2. These codes works well under irix 6.2. The code
> is used to simulate an airport.
>
> But when we compile & run the same code under irix
> 6.5, the runway of the airport keeps flickering. In
> detail, there are several markings in the runway, and
> the markings keep flickering.
>
> I checked the performer manual, which tells me to use
> Decal mechanism to avoid flickering. I do have
> followed the manual, but still cannot avoid the
> flickering problem. Is there any compatibility problem
> between performer 2.0 and 2.2?
>
> Any suggestions are highly appreciated.
>
> Sincerely,
>
> bo
>
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