Research On The Key Technology Of 3D Visualization On Mobile Terminal

With the rapid development of internet and information, many cities and schools have provided 3D models for the people. Many virtual scenes with high sense of reality have been emerged recently. But these kinds of virtual models need very large storage space. Only high-performance computer can support smooth browsing experience. If big-scale virtual interactive scene will be arranged on mobile device, the very limited hardware resource of mobile device must be overcome. Therefore, it is very important to develop 3D virtual interactive scene based on hardware, condition of existing mobile device and the requirement of users.3D models should not be very elaborate. At the same time, in order to help users to understand the environment easily,3D models should be with high intuitive and realness. Under this circumstance, a higher demand of 3D models visualization is proposed and many kinds of technology including real-time blanking and dynamic dispatch become indispensable.Here are the main contents and conclusions of this dissertation:(1) Optimization method of the mobile 3D scene. Based on the principle of computer graphic and advanced 3D engine, focused on the number of vertices, triangles, mapping, material, rendering and many other aspects, this dissertation concludes some problem in the process of 3D scenes construction and proposes some strategy to optimize the 3D scene. Through this way, this lay a foundation for the research.(2) 3D real-time hiding technology. Based on the optimization of models, have a research on the viewport culling and occlusion culling. The scene is divided into several cells and two kinds of culling methods are contrasted. Finally, combining LOD technology with real-time hiding methods to reduce the usage of the graphic memory.(3) A kind of comprehensive dynamic scheduling technology. Combining the caching and asynchronous technology, this research propose a comprehensive method of scheduling including viewport scheduling, walking scheduling, weighting pre-scheduling and three-stage multilevel model scheduling. As a result, the usage of memory is reduced more.In conclusion, taking Nanjing University GuLou campus as study area, this dissertation combines real-time blanking and dynamic dispatch technology to achieve the fluent performance of big-date 3D virtual reality scene on mobile device. The result of this research suggests that the optimization of the scene effectively reduce the burden of the 3D engine, the combination of real-time blanking and dynamic dispatch make good use of the limited hardware resource, and make it possible for the fluent performance of scene with high-accuracy models.