OVR.zip_GAIT Gait gait_gait_zip

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AN OVERVIEW OF VIRTUAL

REALITY

ABSTRACT :-

In our world today we are surrounded by a wonderful array of technologies. We have

assimilated many of these technologies into our everyday lives. Increasingly, these

different technologies are becoming integrated to provide new capabilities and

three-dimensional virtual - or artificial - environment and to interact with lifelike

and/or fantasy elements created by the designer. In the virtual world, the user can

do things as routine as throwing a ball or as fantastic as flying through space. And

these things can be made to occur by something as simple as a hand gesture or a

nod or (one day) a sound.

The following is an attempt to provide an introduction to virtual reality and some

of its basics.The technical paper provides a brief introduction to the new emerging

technology followed by the two types of Virtual Reality systems viz. Desktop Virtual

Reality System and Immersive Virtual Reality System.It also provides information

about the various devices that are used for Immersive Virtual Reality System. Paper

the user think that he/she is in the real environment. One may also experience a

virtual reality by simply imagining it, like Alice in Wonderland, but we will focus on

computer generated virtual realities.

The virtual world is hosted on a computer in the form of a database (e.g. terrain

database or environment database). The database resides in the memory of the

computer. The database generally consists of points in space (vertices), as well as

textures (images). vertices may be connected to form planes, commonly referred to

as polygons. Each polygon consists of at least three vertices. The polygon could

have a specific color, and the color could be shaded, or the polygon could have a

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and interaction through the use of sensors and effectors in a simulated environment.

Advances in simulation technology allow computer resources to be interconnected

with humans through the use of sensor systems and robotic devices. The goal of the

simulation is to have a viewer see only the simulation -- as if the viewer were inside

the simulation itself. Head motion and orientation are used to change the viewer’s

visual perception, making the experience appear real.

whole time.

IMMERSIVE VR SYSTEM :- With Immersive VR the user is 'immersed in' or

'surrounded by' the virtual environment. This may be achieved by using:

1.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 already in 1965. The EyePhone from VPL Research was the first commercially

available HMD (1989).

FIG 1. A HEAD-MOUNTED DISPLAY (HMD)