Methods of virtual reality
From Wikipedia, the free encyclopedia
There are a number of methods by which virtual reality (VR) can be done.
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[edit] Simulation-based VR
The first method is simulation-based virtual reality. Driving simulators, for example, give the driver on board the impression that he/she is actually driving an actual vehicle by predicting vehicular motion caused by driver input and feeding back corresponding visual, motion, audio and proprioceptive cues to the driver. The simulator normally consists of several systems as follows: a real-time vehicle simulation system performing real-time simulation of vehicle dynamics; motion, visual and audio systems reproducing vehicle motion, driving environment scenes and noise sensed by a driver during driving; a control force roading system acting as an interface between the driver and the simulator; an operator console for monitoring system operation; and system integration managing information and data transfer among subsystems and synchronization. The driving simulators have been used effectively for vehicle system development, safety improvement and human factor study.
[edit] Avatar image-based VR
With avatar image-based virtual reality, people can join the virtual environment in the form of real video as well as an avatar. The proposed image VR system can handle two types of users. One can participate in the 3D distributed virtual environment as form of either a conventional avatar or a real video. Background of the video is effectively eliminated to enhance the sense of reality. A user can select his/her own type of participation based on the system capability. Users with capture board and camera may select a video avatar while others select a conventional computer graphics-based avatar. Avatar image-based VR now provides pretty good interaction environment between human and computer far beyond the conventional desktop computer systems. High-speed networks become available with the advance of network technologies.
[edit] Projector-based VR
In projector-based virtual reality, modeling of the real environment plays a vital role in various virtual reality applications, such as robot navigation, construction modeling and airplane simulation. Image based virtual reality system is gaining popularity in computer graphics as well as computer vision communities. The reason is that is it provides more realism by using photo realistic images and the modeling procedure is rather simple. In generating realistic models, it is essential to accurately register acquired 3D data. Usually, camera is used for modeling small objects at a short distance.
[edit] Desktop-based VR
It is the use of animated interactive 3D graphics to build virtual worlds with desktop display and without head tracking. It is important to be clear about the meaning of the term immersion. Webster defines it as "the state of being absorbed or deeply involved." Clearly, immersion can occur while we are playing video game (many of which are examples of desktop VR). Experience suggest that proper 3D cues and interactive animation aid immersion can draw the user into the 3D world. In other word, immersion should not be equated with the use of head-mounted display: mental and emotional immersion does take place, independent of visual or perceptual immersion. A common criticism of desktop VR focuses on the lack of peripheral vision afforded by a desktop display, claiming that the user is not aware of their surroundings or of their location in the virtual space.
[edit] True Immersive Virtual Reality
Hypothetical virtual reality as immersive as consensus reality. Most likely to be produced using a Brain-computer interface.
