Dynamic Generation of Continuous Level of Detail for Terrain
WU Ya dong, LIU Yu shu (Department of Computer Science and Engineering, Beijing Institute of Technology, Beijing100081)
The techniques of real time generation of terrain were investigated. The algorithm adopted continuous level of detail for fast rendering, and dynamically generated terrain meshes according to the roughness of terrain and information of the viewpoint. By using view angle based error metrics, it transformed the screen projection of static error into the view angle with respect to the viewpoint. The algorithm acquired constant frame rates by searching the hierachical quadtree in a topdown manner. The rendering speed was also benefited from the coherence of frames and triangle fans. The experimental results show its high efficiency. The view angle based error metrics and the hierarchy of quadtree reduce the calculations in real time rendering, so it accelerates the rendering speed efficiently.