Virtual City Display System Design And Implementation

When people visit the 3D virtual scene built on the Virtual Reality technology makes one have an immersed sense. Today there are more and more discussions about VR technology applied to building virtual cities, virtual scenic spots and virtual campus. At present, the Virtual Reality System in Internet exists three problems to some extend including model complexity, realistic representation of drawing and real time. A relatively perfect model is: when entering the Virtual Reality System, users can be provided a virtual environment with intensive realistic representative, and users can interact with system. When users submit a query request, the system can execute it and show the query result automatically.The purpose of this study is to discuss the scene modeling, interaction, walkthrough technology in virtual system. The author studied Virtual Reality technology deeply, analyzed and compared various sorts of modeling technology by reading a great deal of correlated document from home and aboard. Basing on this, the construction scheme of Virtual Reality System, which adopts the technology of VRML and Browser's plug-in, is proposed.First, according to the clues of virtual environment construction flow, realizing the complex and static models. In this paper, some principles in the model design are provided to solve the ubiquitous contradictions between fidelity and Real-time display in the virtual scene modeling. Secondly, the article discusses the programming interactive and non-programming interactive technology. By the means of introducing script language, the motion control of virtual models and the interaction of scene information are realized. Thirdly, the way of optimizing VRML files is introduced. These methods realize the preliminary inquires about virtual scene information, and introduce the way of publishing virtual reality scene though the internet. Finally ,basing on this, the article proposes the construction scheme of virtual cities system, and tests the browsing effects.This system also adapts to the 3D construction of cities and reconstruction of old cities. From the long view, can develop several VRML integrated items for common uses, thus, more convenient and efficient development of virtual reality system such as modeling, bitmapping, interactive, setting, animation, effect preview, web-publishing will become possible.