RE: RE: Polygons in Performer 2.0

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Rejean Chartrand (rejeanc++at++cae.ca)
Mon, 15 Jan 1996 11:44:05 -0500

I understand the concept of backfacing but the problem in this case is not
that.

If backfacing was the problem, then the polygon would be either totally
displayed or not displayed at all but not half of it. By looking at the way
the vertices are enumerated, the true normal of the polygon shall in fact be
{0.0, -1.0, 0.0}. But the problem seem to be that polygons in Performer 2.0
(which is a new primitive) are displayed as triangles but it seem that the
normal is flipped from one polygon to the other.

Any idea how to solve that ? (Maybe by not using the PFGS_POLYS primitive)

And what appends if the polygon is concave (which is not the case here), will
it be drawn correctly ?

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