| The research of Multi-Projector immersive virtual environment of virtual reality has been an important area. However, because such systems are based on the construction of professional graphics workstations and high-end projection equipment, the high cost makes its scope of application are largely limited. In recent years, with the rapid development of PC's performance, to establish a PC Cluster driven Multi-Projector immersive virtual environment as a hot spot of study. However, the existing parallel rendering systems are used in visual simulation, but unsuitable for dynamic interactive applications like virtual design and manufacturing, which has also affected the virtual reality technology in the development and promotion of the manufacturing sector.Combining the features and needs of virtual design, bring forward to the research on LOD and progressive transmission technology of parallel rendering system for virtual design. The paper on virtual design-oriented multi-Projector immersive virtual environment software architecture, Parallel Rendering System LOD technology and progressive transmission issues an in-depth study, the main research work are as follows:Firstly, based on the analysis and comparison of the research of virtual environment systems at home and abroad, in view of the characteristics of virtual design, researched of virtual design-oriented virtual environment architecture, and compared Client-Server and Master-Slave two common distributed parallel rendering architecture, focused on the five-channel cylinder screen stereoscopic display system of the Beijing University of Posts and Telecommunications, and gave the parallel rendering system design scheme based on cylinder screen.Secondly, based on the research of quadric error metric model simplification algorithm, put forward the covariance-based improved algorithm, for two algorithms designed and developed relevant model simplification software, and the results of the model simplification were compared. In addition, we studied the classification, dynamic management of LOD model and smooth transition techniques between models.Thirdly, raised the research of the model progressive transmission technology, given the progressive meshes' definition and realization, focus on the research of Client-Server parallel rendering architecture, based on Client-Server, and presented a scheme of progressive transmission. Based on distributed parallel rendering system of PC Cluster, implemented the progressive transmission of 3D model and real-time rendering.On the five-channel cylinder screen stereoscopic display system, based on Master-Slave and Client-Server, we constructed virtual design-oriented distributed parallel rendering platform. Based on Master-Slave, combining LOD technology, developed the virtual assembly application instance. Based on Client-Server, take use of progressive transmission technology, developed a virtual design application platform.Finally, make a summary and outlook for this paper. |
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