pfFlux problems

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Stephen M. Guest (guestsm++at++lmtas.lmco.com)
Wed, 28 Apr 1999 08:32:58 -0500

I recently decided to give pfFluxes a try and thought I understood it
until I ran my code. It turns out when I assign a pfFlux pointer to a
geoset for the coordinates, the geometry is not rendered as intended in
that it appears that certain elements are missing, or some of the
vertices have moved. I can tell that it is close to what I am supposed
to have, but it isn't correct. My first guess was that I had a bad
flux pointer (not pointing at the beginning of the pfVec3 array) or that
the indexing was incorrect and the coordinates were not being
"connected" correctly.

In trying to debug this problem, I went back to experiment with the
Performer sample "morph_engine.c" to make sure that I could follow how
it worked. Since I wasn't trying to set the colors in my code, I
decided to remove the use of the color_flux pointer for the geoset by
commenting out the following line in the sample code:

pfGSetAttr(gset, PFGS_COLOR4, PFGS_PER_VERTEX, (void*)color_flux, NULL);

I thought that it would be ok to do that since even though the code was
still working with the color_flux buffer, it wasn't assigned to the
geoset so there wouldn't be any problems other than no color animation.
When running the sample code with the only change being that line
commented out, there is erratic flashing that looks nothing like the
intended geometry.

I then went one step further in the sample program and commented out ALL
of the code that deals with colors so that the only flux activity left
was for the coordinates and normals. I then discovered that I see a
result similar to what I saw in my code. The geometry displayed looks
like it is missing a tristrip or two and there appears to be an errant
vertex or two. So why does the fact that I don't update the colors
affect the geometry?

I can send my modified "morph_engine.c" code but I figured that I'm
probably missing something pretty basic that someone might be able to
point out.

Much thanks,
Stephen

--


Stephen M. Guest                  Lockheed Martin Tactical Aircraft Systems
guestsm++at++lmtas.lmco.com            MZ 2275
(817)763-2471                     P.O. Box 748
(817)763-3689 Fax                 Fort Worth, TX 76101

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