The definition of virtual reality technology

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					The definition of virtual reality technology
Virtual reality (abbreviated VR), also known as Virtual Reality technology is based on
immersion, interaction, and vision of the basic features of advanced human-machine
interface computer. He utilization of the computer graphics, simulation technology,
multimedia technology, artificial intelligence technology, computer network
technology, parallel processing and multi-sensor technology, simulation of human
vision, hearing, touch and other sensory functions, people can be immersed in
computer-generated the virtual realm, and through language, gestures and other
natural way real-time interaction with them to create a humanoid multi-dimensional
information space. Not only can the user experience through a virtual reality system at
the objective physical world experienced by the "virtual reality"
of realism, but also can overcome space, time and other objective constraints, can not
feel the real-world experience first-hand experience.

VR technology is beyond the reality of virtual sex. Virtual reality system is still the
core of the computer equipment. One of its main function is to generate a virtual
realm of graphics, therefore, also known as workstations. Currently the most widely
used in this field is the SGI, SUN and other manufacturers produce dedicated
workstation, but recently based on Intel Pentium Ⅲ (Ⅳ generation) generation of
chips and computer graphics workstation graphics accelerator excellent cost
performance, it may have sprung up everywhere. Image display device is used to
generate three-dimensional visual effects key peripherals, current products include
light valve common glasses, 3D projectors and helmet displays. One high-end helmet
display in shielding the real world, while providing high resolution, large field of
view angle of the virtual scene, and with a stereo headset, can engender a strong sense
of immersion. Other peripherals used to implement interactive and virtual reality,
including the data glove, 3D mouse, motion tracking, force feedback devices, voice
recognition and synthesis systems, among others. Virtual reality technology has broad
prospects. It began in the field of military and aerospace demand, but in recent years,
virtual reality technology has been a big step into the industrial, architectural design,
education and training, culture and entertainment and so on. It is changing our lives.

Virtual reality has two contradictory meanings the word, these two words together, it
seems pointless, but the development of science and technology has given it new
meaning. Clear definition of virtual reality is not easy to say, the concept of virtual
reality made by the earliest scholars J. Laniar say, virtual reality, also known as
imaginary reality, which means "to use the artificial computer
world." From then on you can clearly see the computer in this area has a
close relationship can not be separated, and information science is the synthesis of the
basic premise of virtual reality. Generated virtual reality need to address three main

① as real the existence of technology. That is, how synthesis of the
observer's sensory organs is consistent with the real input, that is how
reality can produce with the same vision, touch, smell and so on.

② interaction. How the observer active and dynamic operation of virtual reality, in
order to achieve a different viewpoint scene and a higher level of sensory information.
In fact it is more like how you can see, hear more real so.

③ realistic self-discipline. Feel are not aware of how their actions and behavior are
brought to life under the conditions of sense of reality. Here, observers, sensors,
computer simulation system and display system forms a closed loop interaction

Virtual reality is an integrated multi-technology, its key technologies and research
include the following:

1, Environmental Modeling

The virtual environment, the purpose is to obtain three-dimensional data in real
three-dimensional environment, and depending on the application needs to obtain
three-dimensional data set using the corresponding virtual environment model.

2, stereo synthesis and three-dimensional display technology

In the virtual reality system to eliminate the direction of the sound and the relevance
of the user head movements, while the complex three-dimensional scenes in real-time
generated graphics.

3, tactile feedback

In virtual reality systems allow users to directly manipulate virtual objects and feel the
virtual object reaction force, thereby creating immersive feel.

4, interactive technology

Virtual reality human-computer interaction far beyond the traditional keyboard and
mouse model, using digital helmet, gloves and other complex digital sensor device,
three-dimensional interactive technology and speech recognition, voice input
technology has become an important means of human-computer interaction.

5, system integration technology

As the virtual reality system, including a large number of perceptual information and
models, so the system integration technology for the most important: including
information synchronization, model calibration, data conversion technology,
recognition and synthesis technologies.
Virtual reality is a computer construct a realistic model of the image. People can
interact with the model and generates the same with the real-world feedback to enable
people to access and feel like the real world. When people need to structure the
current environment does not exist (reasonable virtual reality), human beings can not
reach the environment (exaggeration virtual reality), or construct a purely imaginary
environment (illusory virtual reality) to replace the need for expensive real
environment, you can use Virtual reality technology.

In order to achieve and feel like the real world, it needs to achieve a variety of sensory
technology. People in the real world is through the eyes, ears, fingers, nose and other
organs to achieve visual, tactile (haptic), smell and other functions. Watch the colorful
people through the external visual environment, rich sound through the auditory
perception in the world, through tactile understanding of the shape and characteristics
of the object through the sense of smell that smell around. In short, through a variety
of feelings, so that we can interact with the objective real world (AC), so that we
submerged the same as in the real world environment.

Here, the most difficult to achieve hearing; implementation is essential to the visual is
the most basic and most commonly used; implementation sense only in some cases
necessary, now is perfect; to achieve the sense of smell has just begun. Information
obtained from the outside world, there are 80% -90% of the visual. Therefore, in the
virtual environment and real environment to achieve the same visual experience, for
access to real sense of submerged sense of utmost importance.

In virtual reality and often display a different image is required to display the image
with the viewer eye position varies. In addition, the requested images to be quickly
generated and real-time sense. For example, when the animation does not require
real-time, in order to ensure the quality of the screen how long each piece of produce
unlimited. The virtual reality images generated when the order of 30 frames / sec.
With such an image generation capability, which together with the appropriate sound
effects, it can give people a immersive experience.

Can provide visual and auditory effects of virtual reality system has been used for a
variety of simulation systems. Urban planning, such systems are playing an enormous
role. For example, many cities have their own short, medium and long-term planning.
Need to be considered in planning the various architectural harmony with the
surrounding environment is compatible with the surrounding new building are the
original construction coordination, so as to avoid the building is completed, only to
find it destroyed the city and the rational distribution of the original style.

This simulation system can also be used to protect cultural relics, to reproduce the
ancient building. The precious artifacts out of the virtual reality display for visitors
and help protect the real antiquities. Museum of Confucius in Qufu, Shandong is to do
so. It also made the Dacheng Hall model, viewers can browse through the computer to
the root Daeseongjeon hollow carved dozens of Panlong large stone pillars, you can
tour around to the back of Dacheng Hall.

Using virtual reality technology built reservoirs and rivers and lakes simulation
system, more people at a glance. For example, set up after the Three Gorges reservoir
model can be built in the reservoir before the completion of visual to see the
spectacular sight. Water inundation which will be the first villages and farmland,
which relics will be submerged, it can take the initiative to solve the problem. If the
establishment of a regional flood control and simulation system, we can simulate what
embankment when the water level reaches the warning line appears dangerous, in
case of breaches which areas will be flooded. This is the formulation of contingency
plans are a great help.

The extensive use of virtual reality to computer applications to a new level, its role
and significance is obvious. In addition, can also come from a higher level view of
their role and significance. First, the concept, from the "main
computer" to "human-subject." The second is
increasing awareness in the philosophy of "virtual" and
"real" relationship.

Past human-machine interface (human communication with the computer) to require
people to adapt to the computer, using virtual reality technology, people do not realize
that they can deal with the computer, but can, as in a normal environment to deal with
things in the exchange with the computer. This brings the complexity of the computer
from the operation of the work of liberation. Increasingly complex information
technology, uses increasingly widespread today, this full potential of information
technology is of great significance.

The relationship between virtual and real is an old philosophical proposition. We are
in a real objective world, or just feel in their own world, materialism and idealism has
been the focus of debate. Visual, for example, we see everything, but the images on
the retina. In the past, images of the retina are a reflection of the real world, so the
objective with the subjective feeling of the real world the world is the same. Now,
virtual reality led to the duality of virtual reality scenes of human senses is real and
exists, but it's really about fictional things. However, acting in accordance
with imaginary things often will reach the right result. Therefore, the philosophy on
the trigger to re-understanding of "virtual" and
"real" relationship issues.

Early 70s in the 20th century began to virtual reality for training astronauts. Since this
is a cheaper, safe and effective training methods, has now been extended to all walks
of life training. Currently, virtual reality has been extended to different areas, has been
widely used.
In technology development, the virtual reality can shorten the development cycle and
reduce costs. For example, in early 1998, Chrysler will be using virtual reality
technology, two new vehicles in the design of a breakthrough, for the first time to
design a new car directly from the computer screen production line, that is completely
omitted the middle of the trial production. As the use of virtual reality technology
superior to the 1500 Chrysler design to avoid errors, save the 8 months of
development time and cost 80 million U.S. dollars. Using virtual reality technology
can also be car crash test, do not use the car can really show the consequences of
collisions under different conditions.

In the virtual reality technology has been and theoretical analysis, along with
scientific experiments, as the law of human exploration of the three means of the
objective world. Use it to design new materials that can change the ingredients in
advance about the impact on the material properties. The material has not produced
using this material before they know the parts produced in different stress situations is
how damaged.

Business, virtual reality is often used to sell. For example, when construction bids, the
design of the program demonstrated using virtual reality technology can be put into
the future owners of the building for visit, such as the height of the door, window
orientation, how much lighting, house decoration, etc., can share their feelings. It also
can be used for a number of tourist attractions and features, uses a variety of
merchandise to sell. Because the use of virtual reality display the charm of these
commodities, than single words or pictures to promote more attractive.

Medical care, in general there are two types of virtual reality applications. First,
virtual human, that is, the digital human body, so doctors easier to understand the
human body model the structure and function of the human body. The other is a
virtual surgery system can be used to guide the surgery.

Militarily, the use of virtual reality technology to simulate the course of the war has
become better and more economical of the most advanced war, commanders training
methods. As virtual reality technology is to achieve a high level, so although not
conduct nuclear tests, also to the continuous improvement of nuclear weapons. War, to
plan for laboratory tests can also play a combat role. Before the start of the 1991 Gulf
War, the U.S. military Bianba Gulf of various natural and Iraqi forces in a variety of
computer data entry, simulation and after various operations set the initial operational
plan. The actual operation of the development and experimental results are quite

Entertainment, the application is the most extensive use of virtual reality. UK and a
ski simulator. User wearing a ski suit, ski foot, Shouzhu ski stick, carrying the head
mounted display, hands and feet are filled with sensors. Although the small room, as
long as doing a variety of ski action, through the head mounted display can be seen
piled snow in the mountains, canyons, cliff, 11 passing from the side, the picture is on
and Ski in ski to really feel the same.

Now, virtual reality technology to create a virtual environment only, but also to create
a virtual host, virtual singer, virtual actors. Japanese TV introduced singer DiKi, not
only singing but also charming and grace, attracted numerous fans have dumped a lot
of groupies want to witness its hosting the Games, forcing television stations had to
explain she is a virtual singer. Walt Disney Co. plans to launch a virtual actor. This
will allow "actors" art in youth, vitality forever. Star paycheck
to high price led to the use of virtual actors is another reason. Virtual actor to become
movie hero, the film will become a branch of the software industry. The software
company will develop software for the countless people buy virtual actors. While, in
the humor and humane, the virtual actor in a very long time or even never be
compared with the real actors, but it does become a good actor. Not long ago turned
into the game by a computer program, "Tomb Raider" heroine
of the film was selected world-renowned figures, indicating that the coming era of
virtual actors.

Virtual reality technology has been and theoretical analysis, along with scientific
experiments, as the three laws of human exploration of the objective world means.
Reference: Baidu Encyclopedia