Virtual Reality ( VR )


Virtual Reality  ( VR )

Ø     What is Virtual Reality(VR)?

    Virtual Reality refers to  a high-end user interface that involves real-time simulation               and interactions through multiple sensorial channels.

Ø          Why VR?

    VR is able to immerse you in a computer-generated world of your own making: a room, a        city, the interior of human body. With VR, you can explore any uncharted territory of the          human imagination.

 

                                  Types of VR System

  • Windows on World (WoW)
–         Also called Desktop VR.
–         Using a conventional computer monitor to display the 3D virtual world.
  • Immersive VR
–        Completely immerse the user's personal viewpoint inside the virtual 3D world.
–         The user has no visual contact with the physical word.
–        Often equipped with a Head Mounted Display (HMD).
  • Telepresence
–        A variation of visualizing complete computer generated worlds.
–        Links remote sensors in the real world with the senses of a human operator. The remote sensors might be located on a robot. Useful for performing operations in dangerous environments. 

 



  • Mixed Reality (Augmented Reality)
–        The seamless merging of real space and virtual space.
–        Integrate the computer-generated virtual objects into the physical world which become in a sense an equal part of our natural environment.


  •  Distributed VR

–        A simulated world runs on several computers which are connected over network and the people are able to interact in real time, sharing the same virtual world.  

 





                       Technologies of VR — Hardware


  • Head-Mounted Display (HMD)
-        A Helmet or a face mask providing the visual and auditory displays.
-        Use LCD or CRT to display stereo images.
-        May include built-in head-tracker and stereo headphones
  
  
                     
  

  
  •           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. 



  • Cave Automatic Virtual Environment (CAVE)
-        Provides the illusion of immersion by projecting stereo images on the walls and floor of a room-sized cube.
-        A head tracking system continuously adjust the stereo projection to the current position of the leading viewer.

                 


  • Data Glove
–        Outfitted with sensors on the fingers as well as an overall position/orientation tracking equipment.
–        Enables natural interaction with virtual objects by hand gesture recognition.

              

  
  •           Control Devices

–        Control virtual objects in 3 dimensions.
                
                                                 




                                            Applications


  • Entertainment
–        More vivid           -  Move exciting          -  More attractive

       
           
  
  • Medicine
-        Practice performing surgery.
-        Perform surgery on a remote patient.
-        Teach new skills in a safe, controlled environment.


  • Manufacturing
–        Easy to modify             -   Low cost               -   High efficient

          
  
  • Education & Training

–        Driving simulators.       
–        Flight simulators.
–        Ship simulators.
–        Tank simulators.

                   



                      

                               Current problems & Future work

  L  Cybersickness / simulator sickness
  L  Low-fidelity
  L  Expensive
  L  Lack of integration between application packages

  J  High-fidelity system
  J  Cost-saving
  J  Collaborative
  J  High-level contact between participants in distributed VR










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