Collaborative Visualization Environments
Edward J. WegmanCenter for Computational
StatisticsGeorge Mason University
Collaborative Visualization Environments Immersive Environments CAVE and PlatoCAVE
Design Issues MiniCAVE
Further Design Considerations
Immersive Environments
Immersive Environments Immersive Multisensory
Vision – 3-D Stereo Sound Sometimes tactile
Visually Large Not a computer screen Not VRML
Immersive Environments
We have tended to see VR in three generic categories Individual Immersive Environments Group Immersive Environments Augmented Reality
Immersive Methods
Immersive Methods
Our system originally consisted of Virtual Research Head Mounted Displays (HMD), Flock of Birds Tracking Unit, and a SGI Crimson VGXT. This was eventually replaced with a Onyx RE2 and later with a SGI Onyx II with infinite reality engine.
Immersive Methods
Immersive Methods Problems with HMD
Low resolution High tracking latency No group interaction
PlatoCave Motivated by Plato’s Republic Motivated by Star Trek Holodeck Motivated by $$$ from ONR, ARO, NSF
Immersive Methods
Immersive Methods
Immersive Methods
Immersive Methods
Immersive Methods
PlatoCAVE PlatoCAVE Construction
Room 20 ft each side 1 Projection Wall - 15 ft Diagonal SGI Onyx II with Infinite Reality
Graphics Stereographics Projector
120 Frames per second CrystalEyes Shutter Glasses
PlatoCAVE
PlatoCAVE
PlatoCAVE
PlatoCAVE
The PlatoCAVE is an example of an augmented reality environment. We say “augmented reality” because the shutter glasses are transparent when being used. So not only is the wearer able to see the computer generated images in stereoscopic 3-D, but also the real environment including others in the PlatoCAVE and also his or her own body. This is generally not possible with HMDs.
CAVE CAVE Construction
Carolina Cruz-Neira 12 Foot Cube 3 Walls + Floor SGI VGX 4 CRT Projectors CrystalEyes Shutter Glasses Head TRacking
CAVE
Design Considerations
Design Considerations
Design Considerations
Design Consideration
Design Considerations
Design Considerations
Design Considerations Angular Parallax
Large parallax impedes stereo fusion Synchronization of Focus and
Parallax Placement Behind Screen Improves
Both Issues
Design Considerations
Head Tracking 6 degrees of freedom for HMD 3 degrees of freedom for Projection
Systems Optimal for one viewer only
Distortion and Latency Not good for group interaction
Compromise Select one nominal viewpoint
Design Considerations
Design Considerations
MiniCAVE Replace SGI with PC running NT
and AGP graphics card with -channel
Replace CRT projector with stereo pairs LCD Projector
Add voice recognition
MiniCAVE
MiniCAVE
MiniCAVE
MiniCAVE
MiniCAVE
MiniCAVE
Acknowledgements Funding: ARO, ONR, NSF Principal Collaborators: Qiang Luo,
Jürgen Symanzik Other Collaborators: Patrick Vanderluis,
Xiaodong Fu, Ying Zhu, Rida Moustafa, Nkem-Amin Khumbah, Fernando Camelli, Antoinette Dzubay, Robert Wall
Present Status MiniCAVE is awaiting permanent
installation. U.S. Patent has been issued for
MiniCAVE environment. Implemented for <$20,000.
Inside a Metal Matrix
Inside a Human Head
Fractal Virtual Landscapes
Flying through a Virtual World
References
Wegman, E. J., Poston, W. L. and Solka, J. L. (1996) “Immersive methods for mine warfare,” MASEVR ‘95: Proceedings of the Second International Conference on the Military Applications of Synthetic Environments and Virtual Reality, 203-218
Wegman, E. J., Luo, Q., Chen, J. X. (1998) “Immersive methods for exploratory analysis,” Computing Science and Statistics, 29(1), 206-214
Wegman, E. J., J. Symanzik, J.P. Vandersluis, Q. Luo, F. Camelli, A. Dzubay, X. Fu, N-A. Khumbah, R. Moustafa, R. Wall and Y. Zhu, (1999) “The MiniCAVE - A voice-controlled IPT environment,” Proceedings of the Third International Immersive Projection Technology Workshop, (H.-J. Bullinger and O. Riedel, eds.), Springer-Verlag, Berlin, 179-190
References
Wegman, E. J. (2000) “Affordable environments for 3D collaborative data visualization,” Computation in Science and Engineering, 2(6), 68-72, 74
Wegman, E. J. and Symanzik, J. (2001) “Data visualization and exploration via virtual reality: An overview,” Bulletin of the International Statistical Institute, LIX(2), 76-79
Wegman, E. J. and Symanzik, J. (2002), “Immersive projection technology for visual data mining,” Journal of Computational and Graphical Statistics, 11(1)
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