polygon outlines

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Kevin Russo (russo++at++ait.nrl.navy.mil)
Tue, 22 Nov 1994 23:08:39 GMT

Is there a way in Performer (1.2) to draw co-planar geometry,
such as grid lines over a terrain or lat/lon over a sphere?

I'm familiar with the decal algorithm, but since my grid line
"decal" geometry is shared among multiple non-coplanar polygons,
it doesn't give the correct effect everywhere. Does pfDecal do
the right thing?

Alternatively, I've tried outlining the polygons using the GL
polymode(PYM_HOLLOW) in my draw node callback, but that doesn't
seem to work on my Indigo2/Extreme, although I may be doing
something wrong.

I even tried implementing Kurt Akeley's "Z-buffer Charms" for outlined
polygons and hidden lines, but it's got a lot of mode changes, and
only seems to work if you draw each polygon one-at-a-time, rather than
all the geometry at once.

Thanks for any help you can give. Hopefully I'm missing something obvious.

- Kevin

--
Kevin Russo
US Naval Research Lab
Washington, DC

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