Research On Visualization Of Data And Accelerate Rendering Method Based On Virtools

Visualization technology in virtual reality can transform massive multi-physical field data into intuitive computer graphics and images. It is widely used in mechanical engineering, aeronautical engineering, etc. However, with the complexity of the model increasing, the efficiency of visualization in virtual reality induces. In order to improve the speed of rendering, accelerated rendering method of massive data is researched, and a visualization system displaying multi-physical field data based on virtual reality environment virtools is developed in this thesis.First, the development and applications about the virtual reality technology and multiple levels of detail algorithm are introduced. Based on the general process of the virtual scene visualization, the architecture of the visualization system is designed.Second, a detailed description for the data structure is given. The key technologies about the model display, the results display, multi-window display and profile display in the visual display are researched in detail. Especially for the profile display, a new and rapid algorithm based on constrained boundary Delaunay triangulation is achieved. By using the algorithm, the speed of profile generated is improved effectively.The efficiency of the visualization is the key problem. In order to accelerate rendering, a mesh simplification method with physical properties constrain is presented based on edge collapse. In the presented algorithm, the curvature and increment of physical properties of edge and triangle regularity are considered as the weight factors when computing the edge collapse cost. The increment of physical properties of edge makes the features of physical properties on origin model retain in the simplified model, and the adjunction of triangle regularity optimizes triangle form of the simplified model. Also the algorithm improves the topological errors because of edge collapse. In addition, the multi-choice technology is used to accelerate the speed of calculation.On the basis, a visualization system based on virtools is developed. The system can be used to display the muti-physical data of the objects during the movement in typical condition. And the simplified algorithm based on the physical properties is verified to be efficient and correct by several examples. Finally, a conclusion is given at the end of the thesis.