~4Dgifts/toolbox/src/exampleCode/opengl/stereo README
This directory contains four OpenGL/Motif programs:
boilerplate.c Basic X-Motif initialization routines
clip.c clip demo with Motif Wrapper
simple_stereo.c Soft stereo example
simple_stereo_re.c Quadbuffer Stereo example
Each of these routines (clip, simple_stereo and simple_stereo_re) use
the Initialization routines found in the boilerplate.c file. The
boilerplate demo creates a toplevel widget, then creates a
GLwMDrawingArea in the toplevel widget, then clears the drawing area
to black.
The clip program is the clip demo found in the "OpenGL Programming
Guide," p. 108, except it is drawn in a GLwMDrawingArea widget using
the Motif library calls. This demo draws a sphere and uses clipping
planes to clip out portions of the sphere.
The simple stereo routines (simple_stereo and simple_stereo_re) draw
a cluster of 6 spheres using the gluSphere library. The spheres are
lit using a single light and the surface of the sphere is shiny. The
cluster can be rotated by holding down the left mouse button and
moving the mouse. These two programs can be placed in and out of
stereo mode by pressing the middle mouse button. Simple_stereo will
be rendered in stereo by the X-server. This is a software
implementation of stereo in a window for machines that do not have
the quad-buffering graphics hardware found on the Reality Engines.
The routine simple_stereo_re will invoke the Reality Engines
quad-buffers to render the stereo image in a window.
Caveat: Because the OpenGL libraries do not currently support the
getmonitor command the state of the monitor cannot be
saved before placing the monitor in stereo mode. To return
the display back to normal viewing the programs
(simple_stereo and simple_stereo_re) invoke setmon -n 72HZ
to bring the display out of stereo mode. If your display
cannot be set to the 72HZ refresh rate change 72HZ in the
source to 60HZ and recompile by typing make.
The program simple_stereo can only be run on a PI with GR2
graphics, an Indigo (XS-24, XZ and Elan) an Indy and
an Indigo2 that are running IRIX 5.2 or later. An error
message that you would receive if you ran it on an early version
of IRIX is: "xxxx:simple_stereo: rld: Fatal Error: attemped
access to unresolvable symbol i\n simple_stereo:
XSGISetStereoBuffer." Here xxxx is the process id.
The program simple_stereo_re can be run only on a
Reality Engine running 5.1 or later. If you were to run
it on a non-Reality Engine you would receive the error:
"Error: GLwMDrawingArea: requested visual not supported."
Neal A. Neuburger, Ph.D.
Member of Technical Staff
Chemical Applications
neal@sgi.com
415/390-5004
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