Design and realization of virtual tourist landscape based on VRML_ArcGIS
基于VRML_ArcGIS的虚拟旅游景观设计与实现

Virtual tour is designed based on the virtual reality technique platform, Internet or other vehicles. The travel landscape is dynamic and vividly presented in front of tourists. Tourists may choose tour route and view speed and viewpoints by themselves. Virtual tour will play an important role in propagandizing, protecting and reproducing scenes and decision-making support. Currently, virtual tour system on the development of research methods are more broadly grouped into four categories: 3D panorama, VRML/X3D language programming methods (such as DirextX, OpenGL), Web3D business software. These methods achieve results, ease of extent and scope of preferences for different applications, each with merits and demerits. Virtual tourist attractions are composed of virtual ground model and the virtual features model. The virtual ground model has geographical features, only located in the virtual scene to reality; virtual features model is needed to simulate the reality, allows users to carefully watch from outside to inside. At the same time, virtual tourist landscape is needed to balance fidelity and display speed, which are also the shortcomings and a major technical difficulty of virtual tour. Virtual tour is the tourism-oriented virtual reality platform on network using 3D-GIS, virtual reality and network technologies. Throughout the building of virtual tour system, the most basic and most important part is the realization of virtual tour landscape, which is related to display effect and display speed of the virtual landscape, as well as the realization of spatial analysis, simulation scenarios and the other functions. Based on the characteristics and realization difficulties of virtual tour landscape, the paper separately built virtual ground and virtual features using ArcGIS and 3DSMax, which have different configuration characteristics. All the models were transformed to VRML file format, and the VRML files were optimized through many methods. Which not only effectively fused virtual ground models and virtual features models, but also gave attention to the fidelity and display speed of models. The paper advanced a suit of design program and key technology of virtual tour landscape, and validated it through exploiting virtual tour landscape of Yuanmingyuan Ruins Park. The paper formed research and exploiting methods and technology of virtual tour, which could provide strong support of digital, virtual, high-tech information methods and means.