Architecture Design And Implementation To The Virtual Reality Prototype System Web-VRGIS

Virtual reality techniques are applied widely, it plays an important role in all areas of social life and production, and it has strong immersive, interactivity etc. The spread of the Internet makes the distance between person and person closer. As the Internet and techniques of3D virtual reality become more mature, people don't content with the two-dimensional interface interaction on the page, combining Internet with virtual reality technique makes the users of virtual reality technique from professional personnel expansion to all the people who can connect to the Internet, which greatly expanded development space and enhance the development potential of the virtual reality technology.VRGIS simulation platform is a mature virtual reality system software of the ocean university of China marine information technology laboratory independent research and development. it has been successfully applied to the many scientific research, education, business projects, it has good effect, the maneuverability is strong, powerful characteristics etc. But, VRGIS simulation platform is a local version virtual reality system software, it restricted by users crowd,3D data, software maintenance etc., its development space decrease gradually, network virtual reality will be VRGIS development direction.This paper with the virtual reality under the network environment, a prototype system framework, network virtual reality model of the data organization and management, network virtual reality system realization as the research object; as the goal of construct the rapid, efficient and practical network virtual reality system,with virtual reality system under the network environment rendering engine architecture design,3D model data structure design and scheduling transmission as the main research contents, design and realize Web-VRGIS network virtual reality prototype system. The mainly work and achievements of this paper are as follows:(1) The architecture design to the virtual reality prototype system Web-VRGISIn this paper, according to the characteristics of the virtual reality system, client rendering engine uses the Plug-in type software system to structure, uses dynamic link library technology to achieve the plugin articulated, combined with C/S and B/S two network connection modes architects as the network structure, realize the architecture design to the overall system of3D rendering and network transmission.(2) Structure design and scheduling transmission of the network3D model dataThis paper uses a relational database to manage and store3D model data, in view of characteristics of the network transmission, relational database storage, optimizes3D model data structure by using LOD detail level technology. Combining technologies such as AOI interest area, the grid index, space intersection test and so on, design VSPLA model data index algorithm which is based on view space position, and finally achieve network3D model data structure design and high-speed index transmission.(3) Realization and release network virtual reality system Web-VRGISRealize the system3D scene model rendering based on the virtual reality technology of the VRGIS platform, add the graphical user interface to rendering engine by using a third party open source library CEGUI, write ActiveX control by using the technology of Microsoft COM interface, and encapsulate the render engine. Realize the system client through technologies such as INF files, digital signature, CAB bag embedded webpage, and finally establish Web server by Apache to realize the Web publishing.