Research On The Technology Of Scene Tour In The Virtual City Based On Series Of Pictures

In recent years, the modernization of city and the informationof city arose people's extensive attention , the technique ofVirtual Realistic ( VR) becomes to researchful hotspot as one ofthe Virtual City 's supporting technique, This text puts forwarda kind of regarding Virtual Realistic system as the core.Itsynthetically uses the technique of VRML, TIP, 3D rebuilding etcthat builds Virtual City quickly.And we regard Zhuhai as theresearchful district, will establish a set of realizing to sinkto immerse, hand over with each other and imagine Virtual Citysystem .This research is used as an openning system and a practicaltechnique,providing a technique that can hand over with each otheroperate, gathering and man-machine harmonizing.First, we need to introduce the method of Virtual City 'smodeling. The scene's modeling is an important step to designVirtual City, which includes 3D models of terrain and surfacefeatures building, textures mapping and special effect designing.In order to construct terrain model, it is necessary to dividethesurface into small parts, calculate the normal line and definecolor for each part;In order to make surface features'model,itis required to divide the surface into 2D triangular pieces,construct transparent and opaque face. The texture mapping isused to improve the scene of Virtual City by joining the photoswith terrain and surface features;special effect designing isused to make the special sight effect for Virtual City by thetechniques such as elimination, illumination and perspective. Thetechnique of LOD (level of detail) can be used to improve therunning speed of the complicated scene's model of Virtual City,but certain compromise between detail information and speed needto be made by adopting the technique of multilevel LOD and by usingdifferent LOD at different time while drawing the scene. Theseproblems will be resolved by the expanded nodes in SDK which isprovided by the BS company in Germany.Whereas,to the large-scale and complicated scene,adoptingGeometry Based Modeling and Rendering's technique isn't far fromenough. Image Based Modeling and Rendering provides a better meansfor tour of the real time. But 'Tour Into The Picture'is anembranchment of the IBMR technic. The TIP( Tour Into The Picture)makes use of only single picture by simple 3D sense of visionrebuilding,and can enter into the scene that expresses the 3Dvision and the tour of real time. Moreover,it is the 3Dreconstruction technique that aims at the seriescharacteristic picture of a building ,and picks up the building'scharacteristic .Following the characteristic points that waspicked from the building's pictures proceeds to 3D rebuild, nolonger depending on those businesseses software( such as 3DMAX,MAYA) to modeling.So it economizes a flood of manpower, materialresources, and produces the profound influencetravel to thevirtual tour of Zhuhai city.In this issue, we will do some researches aiming at some keytechnologies of the construction of virtual cities, thus set afoundation of constructing virtual Zhuhai city.First,Aiming atintroduction of virtual city.Following, introduce the modelinglanguage of VR,and its developing course, operation principle andthe core system. And also give a introduction of the applicationof construction of virtual Zhuhai. From the 3 rd chapter we getinto my major researching direction. Firstly, I will give a briefintroduction on TIP ,including the technology and the process ofmodeling. Secondly I will give a detailed introduction of the keytechnology of TIP,including spidery mesh technology and graphicdetached technology. Thirdly, it is my innovation on TIP.In the part of 3D rebuilding technology,I give a briefintroduction on 3D rebuilding technology, including its currentresearching situation and its development. I also introduce thesome popular methods of 3D rebuilding technology. Last,posing anew virtual city constructing technology based on Globus.To makeuse of a method, technique for adopting route and craft processesproceeded the introduction, so it makes a steady basement for thefuture research.This text makes use of the technique of VRML, TIP, 3Dreconstruction and Globus plane etc. to set up the virtual Zhuhaicity,From a certain meaning it says to that it is a improvementof seting up the virtual city's technology. It expands to usevarious techniques to instead of using the single tool,forinstance 3DMAX,MAYA.It increases the investigative expanding tothe point, saves the manpower and the material resources .At thesame time, it also increases efficiency. For this reason itsmeaning is very important, benefitting to hereafter the researchwork of the virtual world, to people's life and tour providedconvenience.This subject aims at bringing VR technology into virtual cities,exhibiting Zhuhai on internet clearly and interactively. It willa great meaning that establishs the international tour image ofZhuhai city, promotes the capacity of competition of Zhuhai cityand develops the economy of Zhuhai city.