I noticed that the new 3D instruments on pa28-161 causes my frame rate to drop to low single digits (2-3 fps) (Windows 2000, Cygwin, Celeron 600, GeForce2MX). Panning the view so that the instruments are not in view brings it back up to about 20fps. I cannot remember what I got with the 2D instruments though.
How much texture memory do you have? For the current 3D instruments, I used the very large textures from the 2D instruments (the ones for the high-resolution 2D Cessna 172SX panel). Those are mostly 256x256 each, I think, and so they use a *lot* of texture memory (the Attitude Indicator alone has four of them) -- it's not enough to hit my 32MB GeForce2Go, but still, a lot. Also, I'm not starting at KSFO -- the structures around there also use up a lot of texture memory. If you have only 16MB of texture memory on your card, you'll probably be in trouble.
It will be an easy matter to shrink the 3D instrument textures to 128x128 or even 64x64. If it's a texture-memory problem, you'd see the same thing with the 2D or the 3D code.
All the best,
David
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