Design And Implementation Of3D Virtual Geography Scene

The3D virtual geography scene simulation system is a system to be able to simulate the real geographic environment. Virtual environment effect is more intuitive than the drawings, so that users can enjoy the scene before the project completed. The system has basically been able to complete the rendering in the scene; however, with the continuous expansion of the scene, the number of the data decomposition facets increases, resulting in graphics processing lag, so the system can not be guaranteed the real-time and stable interaction. In the large-scale system, the appropriate algorithm is required; therefore, there is a great significance for the study of large terrain generation and line interactive drawing. This paper achieves a system that users can easily with the computer, combined the terrain with road design data.According to the requirements of the subject, this paper focuses its research on interactive Terrain generation and line drawing, and so on. This paper has done the following work:First, the paper summarizes the existing classic terrain and roads algorithms, analyzes the scope and limitations in3D virtual geography scene of different algorithms. This lays the foundation for the research and implementation of the paper.Second, this paper designs the terrain chunking process combined with database, and selects suitable terrain block by comparing the performance. Aiming at the deficiencies of edge insertion and edge deletion crack repairing algorithms, this paper puts forward a method of crack repair of actual elevation instead of interpolated elevation.Again, with the3D terrain as a carrier, this paper uses the method of interactive mouse click, designs the trend line, and achieves the three-dimension line modeling.Finally, by setting up an experimental environment simulation, this paper implements a simulation system of the three-dimensional virtual geography scene, satisfies the real-time of the large-scale scenes, and verifies the feasibility of the program, while analyzes the inadequacies and subsequent improvement that exist in the system.