Virtual reality is the term used to describe a three-dimensional, computer-generated environment, which can be explored and interacted with by a person. That person becomes part of this virtual world or is immersed within this environment and while there, are able to manipulate objects or perform a series of actions. The person wears a head-mounted display (HMD) or glasses, which displays three-dimensional images as part of their experience. Some systems enable the person to experience additional sensory input, e.g. sound or video, which contributes to their overall experience. The concept of virtual reality has been around for decades, even though the public really only became aware of it in the early 1990s. In the mid 1950s, a cinematographer named Morton Heilig envisioned a theatre experience that would stimulate all his audiences’ senses, drawing them in to the stories more effectively. He built a single user console in 1960 called the Sensorama that included a stereoscopic display, fans, odor emitters, stereo speakers and a moving chair. He also invented a head mounted television display designed to let a user watch television in 3-D. Users were passive audiences for the films, but many of Heilig’s concepts would find their way into the VR field.
In 1965, a computer scientist named Ivan Sutherland envisioned what he called the “Ultimate Display”. Using this display a person could look into a virtual world that would appear as real as the physical world the user lived in. This vision guided
References: http://en.wikipedia.org/wiki/Virtual_reality http://www.viz.tamu.edu/faculty/parke/ends375f03/notes/what_vr.html http://electronics.howstuffworks.com/gadgets/other-gadgets/virtual-reality7.htm www.vrs.org.uk/virtual-reality http://www.engineersgarage.com/articles/virtual-reality-environment