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Error metric with roughness of generating LOD of terrain
CHEN Guo-jun1,2,CUI Bao-lei1,CHEN Qing-gang1
(1. College of Computer and Communication Engineering in China University of Petroleum, Dongying 257061,China ;2. State Key Laboratory of Virtual Reality Technology and Systems, Beihang University of Aeronautics Astronautics, Beijing 100191, China)
Abstract:
Error metric is the key problem of generating level of detail (LOD) of terrain surface, which affects the number of triangles and the bias of triangular mesh. On the basis of analyzing various methods of calculating error metric, an improved calculation method of error metric based on the roughness was presented. The roughness was taken to be a factor which expresses the fluctuation of terrain, by which the error metric was calculated,the sphere of error metric was formed according to the position of eye point. The appropriate LOD model on every frame was chosen. The improved error metric applies to the high-altitude terrain overlooking and the generation of LOD in dynamic terrain. The experimental results show that the improved error metric reduces the required number of triangles, and fits the even terrain better.
Key words:  error metric  roughness  sphere of error metric  LOD model