This document discusses collaborative virtual reality (VR) environments. It describes how collaborative VR allows many participants to interact and collaborate in shared virtual worlds over large distances. It outlines four common architectures for collaborative VR - centralized primaries, distributed primaries, data ownership, and active replication. Examples of applications include social entertainment, education, architectural walkthroughs, and medical training. Technologies discussed include VRML and devices like BOOM and CAVE. Recent developments mentioned are DIVE and PlayStation Move controllers. Research groups in the field are also listed.

1. Collaborative VR
Environment
Deepak Kumar Singh-IHC2013004
Sisir Kumar Sarkar-IHC2013005
Indian Institute Of Information Technology- Allahabad
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2. 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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3. 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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4. 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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5. CVE Architecture[1]
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6. 1. Centralized primaries
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7. 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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8. 2. Distributed primaries
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9. Distributed primaries
• Primary replicas are distributed among the computers.
• Advantages: high performance and scalability
• Disadvantages: difficult programming model, weaker
consistency
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10. 3. Data ownership
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11. 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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12. 4. Active replication
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13. 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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14. Popular Collaborative VR
Environment[2]
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15. Social entertainment
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16. IndianInstituteOfInformationTechnology-Allahabad
Education/Training
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17. IndianInstituteOfInformationTechnology-Allahabad
Built environment:architectural walkthroughs
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18. IndianInstituteOfInformationTechnology-Allahabad
Medicine: surgery simulation
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19. Technology used
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20. 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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21. Cave Automatic Virtual Environment (CAVE)
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22. 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.
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23. Advantages :
Save time
NO to Loneliness
Work in a Team
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24. Disadvantage :
Initial cost is High
Increases Unemployment
Prolong usage may cause Psychological or Mental Stress
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25. Recent Discoveries[3]
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26. DIVE[4]
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27. PlayStation MOVE[5]
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28. Research Group
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29. 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.html
5.University Of Minnesota
http://vr.design.umn.edu/
6.Stanford University(Virtual Human Interaction Lab)
http://vhil.stanford.edu/
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30. References
1. http://en.wikipedia.org/wiki/Collaborative_virtual_environment
2. http://www.vrs.org.uk/virtual-reality-
environments/collaborative.html
3. 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.html
5. http://us.playstation.com/ps3/playstation-move/
6. http://vr.coe.ecu.edu/rave/RAVEtext.htm
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