Research On The Generation And Simplification Of LOD Terrain

Realistic 3D terrain is one of the important components of virtual reality system and real time emulation. With the quickly development of virtual reality and emulation, the generation and modeling of high realistic terrain becomes more and more important. At the same time, with the development of mapping technology, it is easy to get massive terrain data now. But because of the limitation of graphics hardware and transport circuitry, we can't deal with these data in real-time. So how to simply the terrain efficiently and quicken the protract speed become the research hotspots broad and home. Recently the most often used way in this field is to generate multi-resolution terrains with level of detail (LOD) technology.Firstly, this dissertation presents the purpose, the background, the application and the prospect of terrain generation and simplification. Secondly, the dissertation gives an introduction of LOD and fractal theory. Thirdly, based on the study of classical modeling algorism, the dissertation puts forward a new method to simulate complex terrain using fractal and LOD. It uses much less data than DEM but gives a good result. Finally, thinking of the low efficiency of the old cracks elimination way, a new bi-directional method is given which can simplify the terrain efficiently and increase the rendering speed.