22-02-2013, 10:49 AM
Internet & Multimedia Technology
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Virtual Reality
The term 'Virtual Reality' (VR) was initially coined by Jaron Lanieh (1989).
Virtual Worlds and Virtual Environments (1990s). Originally, the term referred to 'Immersive Virtual Reality.' In immersive VR, the user becomes fully immersed in an artificial, three-dimensional world that is completely generated by a computer.
A computer system used to create an artificial world in which the user has the impression of being in that world and with the ability to navigate through the world and manipulate objects in the world.
Virtual Reality allows you to explore a computer generated world by actually being in it
Main types of VR
Adventure games Textually described virtual worlds where the user perceives the virtual environment through mental images based on the words read (like reading a novel).
Desktop 3D virtual environment graphically displayed on a desktop computer monitor.
Projected 3D environment projected onto a screen. Enables a single user to demonstrate concepts to a group of people. A CAVE, where several screens are used to surround the user with images, is the most advanced form of projected VR in use today.
Technology Requirements
Hardware capable of processing real-time 3D graphics and high-quality stereo sound.
Input devices to sense user interaction and motion.
Output devices to replace user's sensory input from the physical world with computer-generated input.
Software that handles real-time input/output processing, rendering, simulation, and access to the world database in which the environment is defined.
Sound
Important to create a sense of atmosphere
Can greatly enhance feeling of presence
Can be used to provide aiding navigation
Enables the user to perceive events that occur outside the immediate field of view
Audio feedback (can be useful as a substitute for haptic feedback)
Head-Mounted Display (HMD)
The head-mounted display (HMD) was the first device providing its wearer with an immersive experience.
Evans and Sutherland demonstrated a head-mounted stereo display in 1965.
Input Devices and other Sensual Technologies
A variety of input devices like data gloves, joysticks, and some other hand-held devices allow the user to navigate through a virtual environment and to interact with virtual objects. Directional sound and force feedback devices, voice recognition and other technologies are being employed to enrich the immersive experience and to create more "sensualized" interfaces.