Re: Texture Mapping problem on Max Impact

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Rob Jenkins (robj++at++quid)
Tue, 26 Nov 1996 09:18:55 -0800

It's worth noting that the zbuffer resolution 'spread' is controlled by the
*ratio* of the near and far clipping planes so note that even a small increase
in the near clip value can reduce near:far alot. In other words, always push
the near clip out as far as possible.

Cheers
Rob

On Nov 26, 10:51am, Brian Furtaw wrote:
> Subject: Re: Texture Mapping problem on Max Impact
> Luigi,
>
> The zbuffer resolution close up is high but as you move into the distance the
> resolution becomes sparse. In other words since your objects are so close
> together and far away round off is placing them at the same place in the
> zbuffer. Try pfLayer to place the geometry, that should solve your problem.
>
> Here are two sample programs that you get with poerformer that should help
you,
> /usr/share/src/Performer/src/pguide/libpf/C++/layer.C and motif.C they both
> have C counter parts in the ../C directory.
>
> Brian
>
> On Nov 25, 9:17am, Luigi Rella wrote:
> > Subject: Re: Texture Mapping problem on Max Impact
> > I have a similar problem.
> >
> > I build a terrain model where I put some objects.
> >
> > When I move the point of view in the scene, some polygons blink and the
> objects
> > seem to disapper under the terrain (this effect is appear also in wireframe
> > mode) even if the objects are in the sky.
> >
> > But, for particular view directions everything look fine: objects don't
> > disappear under the terrain model and, moving toward an object in these
> > directions, it looks ok when I am close but they still remain corrupted in
> the
> > distance.
> >
> > I use an Indigo2 R10K running Irix6.2 and Performer 2.1.

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