Research And Realization Of 3D Terrain Visualization System

3D-Visualization is a new hot research topic combined Computer Graphics with Geographical Information System in recent years. It main ideas is use of the geology data that the geography information system collects, by setting up the mold through a geography, the texture reflecting to shoot, the light shining on the model enactment, choice of projection model and terrain cruising function, the dynamic manifestation of terrain with high 3D can be carried out. That technique is abroad used in imitating in the military, the 3D game and visual emulation in industry control. This text sets out from the physiology mechanism of the stereoscopic sense of vision, finding out a better algorithm to produce parallax of stereoscopic sense and projection of stereoscopic vision, using physiognomy relif shading technology of stereoscopic sense of vision, 3D-stereoscopic physiognomy manifestation in the single machine can be carried out. Based on the study of triangle mesh of creation algorithm, include the arithmetic of regular data make triangle mesh and irregular data make triangle mash. The paper put forward a optimized triangle mesh algorithm. Its key point is divide data into pieces in advance, then set up the net. The experiment result shows that this algorithm improves not only the efficiency of terrain molding, but also the precision compared with the old algorithms The main purposes of this paper are research visualization algorithm of three dimensions and the arithmetic of terrain visualization. A system has been achieved by using OpenGL and Vc++6.0. The system is 3D Terrain Visualization System. The system carries out modeling and the dynamic manifestation of terrain and user can understand the terrain from many aspects by cruising function and projection.