Re: ghost polygons

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Liu Xiaoyan (liuxy++at++ihpc.nus.edu.sg)
Tue, 28 Apr 1998 11:30:52 +0800

> > For certain models displayed in our performer applcation, there are
> > some ghost polygons flashing around. While viewed in IVVIEW or
> > saved as .pfb files, they are gone. What's happening? The machine
> > used is Onyx2 with 2 IR , performer 2.1.
>
> Depends on what you mean by "ghost polygons". Might be a problem with
> your models where there are polygons with their back-faces enabled. >Can you be a bit more specific to help us exorcise your ghosts ?
>

By 'ghost ploygons' I mean they don't exsit at all in our original
geometry when built in Alias and other software. After exported to .iv
and viewed in perfly, ivview , they don't come out. Only in our
CAVE performer application do they appear.

They are mostly in the form of triangles(with two-sided lighting
on or off), appear randomly depend on my eye position. Our application
is basically a 4 channel(2 channels share a pipe) program.

Thanks.

Liu
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