Virtual reality technology applies

One, technology of overview virtual reality calls clever condition the technology again, it is 20 centuries end a ability is arisen brand-new omnibus IT, it is shirt-sleeve the many IT branch such as technology of graphics of digital image processing, computer, multimedia, sensor technology, advanced the development of computer technology greatly thereby. Virtual reality system should use all sorts of advanced hardware technologies and software tool namely, the design gives reasonable hardware, software and alternant measure, the fictitious world that makes observation of ground of can seesaw pattern and control system generate participator. Virtual reality technology is a technology with computer at present more popular group. It is with computer simulative real to the spot environment has three-dimensional environment emulate, the user can walk into this environment, can control the direction that browse, operate the object in setting undertakes interactive. Tell from the concept, system of any virtual reality can depict its character with 3 "I" , this is " is enmeshed (Immersion)" , " is alternant (Interaction)" and " imagine (Imagination)" . These 3 "I" reflected the pivotal character of virtual reality system, be system and person is sufficient and alternant, it emphasizes a person the dominant action in virtual reality environment. Concerned expert is fatidical, at the beginning of 21 centuries, the mankind will enter the brand-new technology period of virtual reality quickly. Virtual reality technology is explored through 20 old research, at 20 centuries 80 time end walks out of a lab, begin to enter practical change level. Current, on the world a few developed country is in the domain such as economy, art and even military affairs, already began to use this kind of new and high technology extensively, gained distinct integrated benefit. Virtual reality technology separates fictitious fact view (condition) technology (be like fictitious visit museum of the Imperial Palace) with fictitious empty scene (condition) technology (if virtual reality environment is generated, the Boeing of fictitious design 777 planes) two kinds big. The applied domain of virtual reality technology and alternate field are very extensive, arrived almost the degree of all-embracing, be all-pervasive, in environment of battlefield of virtual reality technology, virtual reality fights direct imitate, virtual reality of plane, shipping, car drives training, of plane, missile, ship and car fictitious make (the fictitious design) that embodies a system, of virtual reality building reveal with look around, virtual reality operation grooms, virtual reality game, the form Chengdu of the application that art of virtual reality movie and TV waits a respect a moment and industry has strong market demand and technical drive. The development of virtual reality technology, not only from go up at all the working way that changes people and lifestyle, lao Heyi rises real couple, people works in enjoying an environment, get enjoyment in working process; And the union of the culture art such as virtual reality technology and art, music, will be born the 9th art of the mankind. As the development of computer technology, on the PC technology of implementation virtual reality already became a possibility. 2, the designs system of target virtual reality design of virtual reality technology should achieve the following goal: The first, the experience that should make participator has " true " . This kind experiences even if " is enmeshed " or " devoted " , namely full moral nature is entered, simple ground says even if generation is in fictitious world medium psychedelic. Perfect fictitious environment should achieve an user to defend oneself hard the degree of true and false, truer than returning " really even " . This kind is enmeshed the meaning of feeling depends on can making the user focuses attention. To achieve this goal, with respect to the capacity that must have much perception, good virtual reality system should have everything what human place has to feel ability, include vision, hearing, touch, even taste and smell. The 2nd, the system wants those who go to the lavatory to be able to be offerred, rich, basically be the interactive method that is based on natural technical ability. These methods make participator can undertake to fictitious environment real time operate, can get feedback information from inside fictitious environment, also can the position of the crucial position of systematic understanding participator, condition, be out of shape the data that waits for all sorts of systems to need to know. Real time sex is very important, if be in alternant when the defer with larger presence, the psychological experience with the person is abhorrent, do not talk to go up with natural technical ability alternant, obtain very hard also be enmeshed feeling. To achieve this goal, high speed computation and processing are indispensable. Participator perhaps is experienced in the activity in fictitious environment have two kinds of forms, one kind is subjective participate in (First-person Activities) , another kind is to be participated in objectively (Second-person Activities) . Subjective when participating in, participator is the center of whole experience, everything undertakes around participator; The participator when be being participated in objectively can see him himself in fictitious environment with other object alternant. Mix interactively the feature of two materiality that be enmeshed is any virtual reality experience, accordingly, what apply according to virtual reality is different, the degree that is enmeshed namely, it can be divided into distinct category. Inchoate virtual reality system may have the character of partial virtual reality only, for example annulus act film or deepie. Some application also does not need to be enmeshed completely and be thrown, enhance actual system for example. In applying actually, the side key that system of different virtual reality designs and place accept an obligation each are not identical. For example, suffer capital to restrict equipment not to go up the most advanced hardware equipment, or it is requirement of short of of hardware itself function, the computational speed of such systems, alternate means should be affected possibly, can begin to remedy flaw from software only right now, produced a lot of technologies that are based on software, the virtual reality system that is based on static image for example, fictitious emulate etc. Because virtual reality itself does not limit use technical scope, want to be able to achieve a goal only, OK an all sorts of technologies are effective the ground is compositive rise the virtual reality system that designs a success. 3, the architecture cent of the technology of architecture virtual reality of virtual reality system is distributed virtual reality and blame distributed virtual reality two kinds of architecture. Be not construction of system of distributed virtual reality- - VUE(Veridical User Environment) of true user environment, it is an incident drive, virtual reality system that will handle intercurrent incident according to a group of regulation, it decomposes individual fictitious world many Client/Server process, these processes can be carried out on different processor, deliver mutual communication through the message. The system includes 3 VR part: Equipment server (process of Device Servers) , application (Application Processes- - also manage as process of a kind of server) peace conference word manages DM(Dialogue Manager) . Equipment management implement administrative input exports equipment; Conversation management is the client program of equipment server, it is the server that uses a process at the same time, it defined the alternant regulation of fictitious world, the incident that be coordinated and delivers generation of input equipment server arrives applied process, will answer incident to deliver output equipment server next, conversation management is delivered through asynchronous message will correspond with other server, deliver incident according to regulation. System of distributed virtual reality is one supports much person to pass a network to undertake in real time interactive virtual reality system, every user is in environment of a VR (block diagram form of 3D of sense of reality, stereo) in the computer that carries couplet network and other user undertake alternant. The research development work of DVR is early in 20 centuries 80 time place began, in recent years the flying development of network technology advanced the research of DVR and development further. 1.

The system of diagnostic 　 DVR of system of distributed virtual reality should have the following a feature of the respect: The virtual work space that ① shares; The behavior sense of reality of ② bogus substance; ③ backs real time alternant, share clock; Many users of ④ correspond each other with a variety of means; ⑤ resource information is shared and the object in allowing user nature to operate an environment. 2.

The system of demand 　 DVR of system of distributed virtual reality has part of 4 basic composition: Graphic display, communication and control equipment, processing system and data network. DVR system is the organic union of distributed system and VR system, its demand but from the following two methods will elaborate: The demand of VR itself demand and distributed system. The diagnostic user with the most substaintial VR is right of fictitious setting be enmeshed, the different form that participates in VR according to the user and the level that be enmeshed are different, we can differentiate the virtual reality technology of all sorts of types 4 kinds: The virtual reality of virtual reality desktop of 1) desktop class uses PC and elementary workstation to undertake emulation, the screen of the computer uses a window that observes fictitious state as the user, all sorts of peripheral equipment are used commonly control fictitious state, and conduce to operate all sorts of objects in fictitious scene. These peripheral equipment include a mouse, track a ball, pitching moment ball. It asks participator uses positional tracker and another hand to accuse to input equipment, be like a mouse, track a ball to wait, sit before monitor, observe the fictitious state inside 360 degrees of limits through computer screen, operate among them object, but at this moment participator was not thrown completely, because it still can get all round the interference of real environment. The virtual reality of desktop class is the biggest the characteristic is the function that lacks complete investment, but cost is relatively a few lower also, consequently, applied range is wider. Technology of common desktop virtual reality has: Be based on the virtual reality technology of static image: This kind of technology does not use the conventional means that uses the computer to create image, and uses what film continuously image and video, in the computer joining together drafts a space with built solid Jing Huaxu, this makes height complex with height distinct fictitious setting can get with very small computation price, make virtual reality technology likely thereby come true on PC platform. ) of language of modelling of VRML(virtual reality: It is a kind of technology that provides perspective extremely in the application on Internet net, it uses the text language that describes a gender to depict the model of basic three-dimensional object, pass proper control, these main three-dimensional model group synthesizes fictitious setting, when the browser browses these text to describe information, undertake explanatory executive in this locality, create fictitious three-dimensional setting. The biggest characteristic of VRML is describing three dimensional space at using text version, reduced the data bulk that transmits on Internet net greatly, make thereby the virtual reality that needs mass data is able to come true on Internet net. Desktop CAD system: Use the top of a table such as Open GL, DirectDraw technology of three-dimensional graph scale undertakes building a model to fictitious world, the monitor that passes the computer has observation, have viewpoint of pilot of can free land and perspective. Technology of a kind of virtual reality also is for in a sense of this kind of technology, it builds three-dimensional model through computer computation, of the model complex degree of restriction that accepts ability of desktop computer computation with sense of reality. The function that system of advanced virtual reality provides the virtual reality that 2) throws to be thrown completely, make the user has a kind of place oneself at the feeling in fictitious state. It uses helmet type monitor or other device, close the vision of participator, hearing and other feeling rise, offer new, fictitious sensory space, use hand of glove of positional tracker, data, other to accuse to input equipment, sound to wait make participator generation is a kind personally in fictitious environment, can total heart is thrown and be enmeshed among them feeling. Be enmeshed commonly type system has: Be based on the system of helmet type monitor: In this kind of system, the person that share fictitious experience should wear monitor of type of one build armet, inspect hearing and outside isolation, what the basis applies is different, the system will provide the stereo vision that can turn along with the head and produces subsequently, three dimensional space. Wait for advanced interface equipment through dress of glove of speech recognition, data, data, make participator undertakes with natural way and fictitious world thereby alternant, as real world same. This is to be enmeshed at present system of degree of top a kind of virtual reality. Umbriferous type virtual reality system: It can let participator see his itself from a screen the figure in fictitious state, for this, the " key in technology of the TV in using accuses the technology of " , participator stands in some simple look (it is orchid color normally) below setting, wear the camera in front of participator to take the form of participator, pass join cable, picture number gives tiring-room the computer of processing as it is said, the computer parts the figure of participator and pure lubricious setting, change a fictitious space, on the screen that the video measuring projector that is linked together with the computer projects the figure of participator and fictitious state itself participator is watched together, such, participator can see him himself the mobile circumstance in fictitious space. Participator still can undertake with fictitious space real time alternant, the computer can spot the movement of participator, change fictitious space according to the movement of the user, more fictitious than if make a round trip,patting ball or ambulate etc, this can make participator feeling is seemed like be in true space. Put remotely in the system: Long-range existence system is the system that a kind of virtual reality and photograph of robot control technology integrate, operate when the participator of somewhere when system of a virtual reality, its happen in another place however as a result, participator acquires deepness move through stereo monitor, the camera of monitor and far ground is linked together; Dog with feedback device through motion the motion of operator, the athletic process of feedback far ground (wait for) like damp, collision, convey the movement to be finished far. The virtual reality that 3) enhances the virtual reality of actuality to enhance actuality is to use virtual reality technology to come to imitate reality world, emulation reality world not only, and should use it to enhance the participator feeling to real environment, the imperceptibility in enhancing reality namely or no-go perception are experienced. The example of model of this sort virtual reality is the head-up display of air man of opportunity for combat, it can aim appearance reading and weapon data to project installation is on the penetrable type screen before air man, it can make air man need not lower its head to read the data of the appearance in cockpit, can center energy to staring at the enemy's plane and navigation deviation thereby. 4) is distributed virtual reality if many users join together through computer network, enter a fictitious airspace at the same time, learn fictitious experience jointly, that virtual reality promoted a taller state, this is system of distributed virtual reality. At present system of the most typical distributed virtual reality is to fight emulation Internet and SIMNET, fight emulation Internet (Defense Simulation Internet, DSI) is current one of the biggest VR projects. This project is a standard that urges by American department of defense, the purpose is to make all sorts of different emulator can be in giant the interconnection on the network, it is the production that the SIMNET that bureau of advanced research plan offerred American national defence 1980 plans. SIMNET by tank emulator (of Cab type) join through the network and become, the combination that is used at army trains. Pass SIMNET, the emulator that is located in Germany is OK move in with the emulator that is located in the United States same a fictitious world, participate in same field to fight maneuver. CNC Milling