Changes in CAVE Library Version 2.5.6
(installed 6 June 1996)

Functions & other major changes

• Added CAVENavMultMatrix().
• Added CAVE_GL_SAMPLES, CAVE_GL_STENCILSIZE, and CAVE_GL_ACCUMSIZE options for CAVESetOption - allows multisampling / stenciling / accumulation in OpenGL as well as IrisGL.
• If the configuration specifies no walls, a dummy display process will be started, in order to update shared memory (tracking, etc.) properly. The dummy process does not call any application callback functions.
• Added alternate networking methods - TCP (using server program) and CAVEComm. Selected with "Network tcp" or "Network c2c" configuration; "Network mcast" selects multicast method. "Network c2c" will only work with IrisGL, since libc2c requires the GL sphere library; link with the -lcave_c2c (and -lc2c -lsphere) to use this option.
• Library should be compilable under Linux.

Configuration

• DisplayMode configuration option now just controls the rendering method, not the video mode. Options are mono, stereo, and oldstereo. Removed NonCAVEDisplayMode. Eliminated use of /usr/local/CAVE/bin/DisplayMode.
• Added configuration options WallInitCommand and WallExitCommand, for specifying shell commands to run when a wall starts and when it exits. Can be used for changing video modes, in place of the old DisplayMode / NonCAVEDisplayMode method.
• Made InterocularDistance default to 2.75 inches, rather than 0.
• Added "ReverseStereo y|n" configuration option. When true, causes left eye view to be drawn in right eye buffer, and vice versa. Intended for incorrect stereo formats that were supplied with the IR.
• Added "FilterBirdsParameter" configuration option. Determines which filters are used when Flock-of-Birds filtering is enabled. See Ascension manual for values (under CHANGE VALUE/FILTER STATUS).
• "HideCursor Y" now works with OpenGL and with Performer.
• Added support for Spaceball devices for custom wand (and CAVEgetbutton / CAVEgetvaluator) (IrisGL only).

pfCAVE

• pfcave library now includes cave library - use just -lpfcave_igl (or -lpfcave_ogl) rather than -lpfcave -lcave_pf.
• Added pfCAVEHalt() function to pfcave libraries.
• pfcave.h assumes OpenGL unless IRISGL is defined.

Other

• Changed Flock of Birds tracker synchronization so that tracking will run at double the rate of the display (96 hz rather than 48 hz).
• Fixed bug in networking (from 2.5.5) - head data was being sent for all tracker sensors.
• CAVEConfigure tries to watch out for (0,0,0) rotation axes, which are bogus.
• Changed Logitech tracking to use DefaultTrackerPosition / DefaultTrackerOrientation values for sensors which are not being read.
• Renamed 'sync' member of CAVE_ST to 'procsync'.

Post-release changes

• 2.5.6a (16 June 1996) - Fixed bug in multisampling in OpenGL library; had been possible to get a multisampled color buffer with no depth buffer.
• 2.5.6b (13 July) - Fixed networking bug in pfCAVE libraries; incorrect orientation data was being broadcast.
• 2.5.6c (15 July) - Fixed serious networking bug which caused application data to be mangled when using CAVENetReceive().
• 2.5.6d (4 November) - Fixed networking bug which messed up CAVEUser[] array when a user was deleted.
• 2.5.6e (11 November) - Made DefaultTrackerPosition configuration option be scaled by Units and CAVEScale options. CPUlocking is disabled if the system call to mplock fails.
• 2.5.6f (2 February 1997) - Fixed various bugs in pfCAVE libraries - stereo projection was wrong when the head roll angle was non-zero (when the user tilts his head); HMD projection was completely wrong; CAVEGetVector() computed incorrect up, down, left, and right vectors; CAVEGetSensorOrientation() reversed azimuth & roll.

Last modified 2 February 1997.