Re: got it to crash....

[slevy]

Hey, Celeste!  Good to hear that your obscure-bug homing skills are
undiminished.  :-)

The inverted lines-closer thing is pretty neat.  Could the reality engine
have a full 31- or 32-bit Z-buffer?  The lines-closer code shifts the z-buffer
range by some fraction of the difference zmax - zmin, taken as a (signed) int.
Maybe it needs to be unsigned.  I've tried to fix this and your other bug in 
the source code here, I think.  If you feel like trying it out, you could
grab /u/gcg/ngrap/src/bin/geomview/gl/gvx.

   Stuart