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Collaborative VR Environment
Deepak Kumar Singh-IHC2013004Sisir Kumar Sarkar-IHC2013005
Indian Institute Of Information Technology- Allahabad
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Virtual Reality• Virtual Reality refers to a high-end user interface that
involves real-time simulation and interactions through multiple sensorial channels.
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Virtual Reality Environment• A computer generated world with which user can interact is
called Virtual Environment• This interaction can vary from looking around to interactively
modifying the world.
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Collaborative VR Environment• CVEs, are used for collaboration and interaction of possibly
many participants that may be spread over large distances. • The applications are usually based on the shared virtual
environment.
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CVE Architecture[1]
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1. Centralized primaries
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Centralized primaries-
• All primary replicas of each data item resides on the same computer called server.
• Advantages: complete server control over the scene• Disadvantages: performance is limited by the server computer
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2. Distributed primaries
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Distributed primaries
• Primary replicas are distributed among the computers.
• Advantages: high performance and scalability• Disadvantages: difficult programming model, weaker
consistency
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3. Data ownership
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Data ownership
• Primaries are allowed to migrate among the computers. This approach is often called system with transferable data ownership.
• Advantages: more flexibility compared to Distributed Primaries• Disadvantages: high amount of ownership requests may limit
the system performance
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4. Active replication
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Active replication
• Active replication uses peer-to-peer approach while all replicas are equal. Usually, atomic broadcast is used to deliver updates to all of them, thus they are kept synchronized.
• Advantages: complete scene synchronization (equal scene content on all computers)
• Disadvantages: the performance is limited by the slowest computer in the system
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Popular Collaborative VR Environment[2]
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Social entertainment
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Education/Training
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badBuilt environment: architectural walkthroughs
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Medicine: surgery simulation
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Technology used
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Binocular Omni-Orientation Monitor (BOOM)
- Head-coupled stereoscopic display device.- Uses CRT to provide high-resolution display.- Convenient to use.- Fast and accurate built-in tracking
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Cave Automatic Virtual Environment (CAVE)
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VRML(Virtual Reality Modeling Language)
- Standard language for interactive simulation within the World Wide Web.
- Allows to create "virtual worlds" networked via the Internet and hyperlinked with the World Wide Web.
- Aspects of virtual world display, interaction and internetworking can be specified using VRML without being dependent on special gear like HMD.
• VR models can be viewed by Netscape or IE with a browser plug-in. Indi
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Advantages :
Save time
NO to Loneliness
Work in a Team
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Disadvantage :
Initial cost is High
Increases Unemployment
Prolong usage may cause Psychological or Mental Stress
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Recent Discoveries[3]
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DIVE[4]
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PlayStation MOVE[5]
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Research Group
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1.Advanced VR Research Centre (AVRRC) Loughborough University, UK http://www.lboro.ac.uk/research/avrrc/
2. National Center for Supercomputing Applications (NCSA) [6]
-Argonne National Laboratory -Alliance Center for Collaboration, Education, Science and Software (ACCESS)
3.Immersive Interaction Group http://iig.epfl.ch/4.Swiss Federal Institute of Technology http://archiveweb.epfl.ch/vrlab.epfl.ch/research/research_index.html5.University Of Minnesota
http://vr.design.umn.edu/6.Stanford University(Virtual Human Interaction Lab)
http://vhil.stanford.edu/
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References1. http://en.wikipedia.org/wiki/Collaborative_virtual_environment2. http://
www.vrs.org.uk/virtual-reality-environments/collaborative.html3. Collaborative virtual environments: going beyond virtual reality,
Roberta L. Gomes, Guillermo J. Multimedia and Expo, 2003. ICME '03. Proceedings. 2003 International Conference on (Volume:2 )
4. https://www.durovis.com/dive.html5. http://us.playstation.com/ps3/playstation-move/6. http://vr.coe.ecu.edu/rave/RAVEtext.htm
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