Abstract similar remarkably to our own. For designing

Abstract
– In today’s world , we are surrounded by wonderful
varieties of technologies. We have acquired majorities of these technologies
into our everyday lives. Increasingly, these different technologies are
becoming integrated to provide new capabilities and services. And most often a
computer is the heart of this integration. This is the case with Virtual
Reality a so called technology which actually is a very sophisticated
integration of a number of technologies.

Virtual Reality is a technology
based on computer which assimilates specialized input and output devices by
allowing the user to interact with and experience an artificial created environment
as if it were in the real world. A VR system allows the user to explore and
interact with a three dimensional virtual or artificial environment generated
by the designer. In the virtual world, the user can do all things similar to
routine as throwing a tennis ball or as excellent as flying through space. And
these things can be made possible to occur by something as simple as a hand gesture
or a nod.

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Virtual Reality is a three
dimensional computer generated interactive environment which simulate reality.
Virtual Reality can take us into a world which is imaginary and appears similar
remarkably to our own. For designing a virtual reality system , one have to deals
with ideas of spatial relationships and computer graphics which in turn are affiliated
to mathematics , physics , arts and also human psychology. In these virtual or
synthetic environ-ments , one have to take into account various physics laws like
gravity , air resistance , and speed etc.

Keywords:
Virtual Reality, Computer based technology,
Virtual Environment, Artificial Environment, Second life, Augmented Reality.

 

1.     
INTRODUCTION

 

Virtual Reality (VR) technology is becoming more perfect and
immerging with the aid of computer hardware, software and virtual world
integration technology, which can simulate the real world dynamically. This
technology

can make reaction according to people’s form, language and So on
immediately after a real time commu-nication is formed between people and
virtual world. Hence , for past few years such technology has catch up much
attention of researchers and companies.

 

Virtual
Reality (VR) can be defined as use of computer modelling & simulations which
help  a person in interacting with artificial
3D enviro-nment. This 3D artificial environment shows reality with help of some
interactive devices which can send and receive information and are worn in form
of goggles, headsets, gloves or body suits etc. In other words, virtual reality
can be defined as use of computer graphics to simulate presence physically in
artificial or virtual environment & to create a realistic looking world. Virtual
Reality is a real time and interactive technology; which means that the
computer can detect itself user inputs and modify instantaneously the virtual
world.

 

Most latest
VR environment are primarily visual experiences which are displayed on a
computer screen ; but some simulations may require addi-tional sensory
information such as speakers or headphones. Sometimes, Users can also make interaction with a virtual
environment either by use of standard input devices such as a key-board , mouse
etc.

 

In
practice, it is much hard currently to get a high fidelity virtual reality
experience mostly because of technical limitations on processing power & image
resolution. However, those limi-tations are expected to eventually be overcomed
by use of more powerful , cost effective proce-ssor and imaging technologies
over time.

 

 

 

2.     
LITERATURE REVIEW

 

Bharath et al.1 presented their paper on  “Importance & Applications of Virtual
Reality in Engineering sector”. In this paper; Virtual reality is defined as an immerging technology that can provides capability to realize actual working
environment . Further, approaches needed to realize virtual reality are covered
& presented. Paper also explores importance and usage of virtual reality in
engineering sector like design, manufacturing, inspection tooling, assembly,
prototyping etc. Moreover ; benefits, costs, limitations and risks
associated while adopting VR are also discussed and highlighted.

 

Radharamanan et al.2 
represented
their paper on “A survey of virtual reality technologies , it’s applications
and limitations”. In this paper various technologies that are used for virtual
reality are highlighted like Head Mounted Display (HMD), Caves, Hand Gloves, 3D
Mouse, Space ball, Full body suits, Video camera and sensor etc. In addition ;
technical aspects of virtual reality techno-logies are also covered. At last
advantages & limitations of using virtual reality in present and for future
are also summarized.

 

 

3.     
 NEED
OF VIRTUAL REALITY

Due to increasing advancement in
technologies & to fulfill growing need of customers ; Virtual reality is
now a day’s consider most immerging and efficient technologies which has not
only overcomed limitations of augmented reality but also made human life simpler
and easier. Some of the growing needs of virtual reality are as follows :

1)      Simulate the
real world dynamically by use of computer software , hardware and virtual world
integration technologies.

2)      Can simulate
physical presence in places in the real world as well as in imaginary worlds.

3)      Without
feeling any real danger ; we can be part of the action on the virtual safe
environment.

4)      Virtual
reality can help us to visualize working environment where people cannot go
especially mars or low temperature environment by making same atmospheric
conditions by use of computer graphics software and use of headsets , gloves
etc & make them feel same physical presence.

 

                    

     Fig – 1: Use of virtual reality
technology

              
(HMD) for gaming purpose

 

          

       
    Fig – 2: Need of virtual reality
technology

                             (Oculus Rift CV1) for training

 

4.     
WORKING PRINCIPLE OF VIRTUAL REALITY

 

The Virtual Reality system works
on the following principle :

·        
It tracks
the physical movements in the real world , then a rendering computer redraws
the virtual world to reflects those movements. The updated virtual world is
sent to the output (to the user in the real world).

 

·        
In this case
, the output is sent back to a head mounted display. Hence, the user feels
“immersed” in the virtual world as if they are in the virtual world
itself as all they can see their rendered movements in virtual environment.

                        Fig – 3 : Virtual Reality hardware structure