Virtual Reality 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 &quot;virtual reality&quot; 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 ¢ó (¢ô 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 &quot;to use the artificial computer world.&quot; 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 issues: ¢Ù as real the existence of technology. That is, how synthesis of the observer&#39;s sensory organs is consistent with the real input, that is how reality can produce with the same vision, touch, smell and so on. ¢Ú 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. ¢Û 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 process. 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 &quot;main computer&quot; to &quot;human-subject.&quot; The second is increasing awarenes in the philosophy of &quot;virtual&quot; and &quot;real&quot; 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&#39;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 &quot;virtual&quot; and &quot;real&quot; 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 consistent. 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 &quot;actors&quot; 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, &quot;Tomb Raider&quot; 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.