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It's hard to tell what might be wrong with your transformation if you
don't also show the transformation matrix you are using, including
the camera parameters. What you probably want is for your transform
to go from some world space coordinates (your 5,5,5) to screen
space. It's also not clear if you are expecting device coordinates
(0..1023, 0..767) or normalized coordinates (0..1, 0..1). Your
resulting coordinates aren't too far off for some camera vaguely
pointing at the origin and a device coordinate transformation matrix.
Paul
On 23-Nov-07, at 7:43 PM, Pietro Gagliardi wrote:
Hello. I realized that that last /usr/glenda/bin/rc/pull focused on
a rewrite to the system libraries. I decided to start writing a
library to convert 3D coordinates to 2D coordinates based on the
data at http://www.shade.ca/getarticle.asp?i=11. You can find it
at /n/sources/contrib/pietro/3d.bundle. It contains: 3d.h (the
header), 3d.c (the library itself), and 3dtest.c (a test program).
The test program doesn't seem to work right. It looks like the 2D
coordinates are way off the charts - the x coordinates are between
500 and 600 for xyz=(5,5,5)! I wonder... This makes the line a stub
in the center of a 1024x768 screen. Plus, the threadmain crashes on
threadexitsall. What's going on?
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