Re: concave polygons in performer

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Marcus Barnes (marcus++at++multigen.com)
Tue, 15 Oct 1996 09:36:32 -0700

On Oct 15, 9:45am, Angus Henderson wrote:
> Subject: Re: concave polygons in performer
> >It's probably a 4 sided polygon that's not coplaner.
>
> It must be not coplanar and not convex.

Not exactly. In the several cases that I've seen, they have always been 4
sided, non-coplaner (wrt Z axis) polygons. It's simply a case where
pfdGeoBuilder's triangulation fails. Both IRISGL and OpenGL (and hence
MultiGen) can directly render the original quad. As I recall they were always
trapazoidal too.

Regards.

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