Re: Triangle Troubles

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Angus Dorbie (dorbie++at++sgi.com)
Wed, 03 Jun 1998 11:34:14 -0700

Uwe Pachler wrote:
>
> hmmmm. This is my clipping plane setting:
>
> #define NEAR_DISTANCE 0.2 // distances for near/far object culling
> #define FAR_DISTANCE 20000.0 // see pfChanNearFar
>
> ...
>
> pfChanNearFar(chan, NEAR_DISTANCE, FAR_DISTANCE);
>
> Is that a problem?
>
> But it shouldn't, because everything else looks normal.
>
> Another point is that the effect occurs much more often
> when I start the application using a tracking system (the user's head
> will be tracked and the view will be adjusted - we use an HMD). If I start
> it with mouse control, the error occurs only sporadic. I assume that this
> is because the view coordintates change every frame when I use the
> tracker.
>
> Uwe Pachler
>

P.S. using overlay planes then lets you sen sensible near CLIP planes.
You may be seeing z fighting with objects in the very near distance,
your zbuffer precision get's hosed with very near values but ofcourse
this all depends on the size of your gas mask w.r.t the near clip plane.

Cheers,Angus.

-- 
"Only the mediocre are always at their best." -- Jean Giraudoux 


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