From: Michael Croswell <croswell@FORTNET.ORG>
Subject: TECH: Stereo, OpenGL and i-Glasses
Date:         Thu, 10 Oct 1996 21:31:03 -0600
Message-ID:  <1.5.4.32.19961011033103.005d7028@Linden.FortNet.Org>


Hello,

 I am new to your listing and hope someone can direct me to a problem
I have.  My colleagues and I wrote an Augmented Reality-type
application that demos our concept of a hands-free interface.  A
see-through stereo HMD was created for us by Honeywell but now, 2.5
years later, has finally broke.  VIO has a less expensive alternative
in the form of their "Virtual i-Glasses", that we will probably use as
a substitute.  I have less than two weeks to replace our existing
software/hardware with these glasses.  My software uses OpenGL in
"callback" mode and simple MS Windows calls to draw lines in an XOR
fashion to two halves of a virtual screen.  The graphics card (by STB)
has separate VGA outputs, one signal for each eye.  Unfortuneatly, the
VIO glasses have a single input and though I can draw each eye to
different frames I don't know how to synchronize the frames to the
correct output frequency nor, the alternative, how to interlace simple
lines without having to write my own assembly routines that would skip
scan lines.  Any ideas?

Thanks very much,

-Mike

                /\   /\
         /\    /  \ /  \     /\  /\
        /  \/\/    \  /\\ /\/  \/  \
       /            \/  \/     /    \
      /    Michael L. Croswell       \
     /     Advanced SW Development    \
    /      Computer Sciences Corp.     \
   /       croswell@fortnet.org         \
  http://www.cs.colostate.edu:80/~croswell/