Slide 1: CAVE Exploration
Media Union 3D Lab
Klaus-Peter Beier Steffen Heise Brett Lyons Eric Maslowski Lars Schumann
beier@umich.edu heise@umich.edu lyonsb@umich.edu emaslows@umich.edu larsi@umich.edu
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Slide 2: The CAVE
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Slide 3: Projector
Electrohome CRT projectors
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Slide 4: Glasses
CrystalEyes
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Slide 5: Wand
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Slide 6: Tracking
Ascension’s Flock of Birds
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Slide 7: Data Gloves
Pinch Gloves
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Slide 8: Computer
SGI’s Onyx 2 (4 CPUs, 2 Infinite Reality Pipelines)
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Slide 9: The Pros of the CAVE
•Currently the best immersive Environment
The Cons of the CAVE
•Expensive (Room $250,000 + SGI $750,000 = $1,000,000) •Expensive repairs + running costs •Not mobile
The CAVE is sometimes an “overkill ”
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Slide 10: Other Devices
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Slide 11: What is the GeoWall?
•Low-cost stereo projection system •Ideal for classrooms •Off-the-shelf hardware •Free software (Off-the-shelf or open source) •Many demos in a wide content range •Mobile
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Slide 12: CAVE Applications
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Slide 13: VR Areas
•Complex, Three-Dimensional Geometry •Complex Behavior and Functionality •Non-Existing or Not-Yet-Existing Worlds •Invisible or Hidden Worlds •Remote Locations •Dangerous Situations •Preservation of Resources •Cost and Time Savings •Communication, Demonstration, Promotion •Art and Entertainment
From Peter Beier’s lecture Eng477, “Principles of Virtual Reality”
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Slide 14: Components of a VR application
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Slide 15: The Model
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Slide 16: Mathematical Model
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Slide 17: Tessellation
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Slide 18: Level of Detail (LOD)
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Slide 19: Scene Light Group Geometry Geometry Transform Switch Geometry Geometry Transform Transform Sequence Geometry Geometry Geometry Light
Scene - root node of a scene graph Group - generic grouping node Transfom - a transformation which can change Switch - selects children to be active Sequence - cycles through a series of children
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Slide 20: The Programming Environment
Unix (Irix, Linux) C++ Performer CAVELib Additional in-house libs
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Slide 21: Performer
•Designed for high-performance interactive graphics •Very efficient, if there is more than one view in a scene •Classes for multiprocessing •Classes for scene manipulation •Libs for C and C++ •Generates calls for OpenGL
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Slide 22: CAVELib
•Specifics of CAVE •Displaying •Interaction •Tracking •Networking
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