| 摘要: |
| 误差判据是生成地形表面细节层次的核心问题,影响着三角形数目和地形三角形网的偏差。在分析各种误差 判据计算结果的基础上，提出基于粗糙度的误差计算方法。采用表征地形起伏形状的粗糙度作为因子,建立误差评 价函数，结合视点位置形成误差判据球，最后根据误差判据球生成地形细节层次模型。对误差判据改进后,适用于 高空俯视地形及动态地形的细节层次技术(L0D)生成。试验表明,改进的粗糙度误差判据降低了地形网格中的三 角形数量,对平坦地形的优化效率较突出。 |
| 关键词: 误差判据 粗糙度 误差判据球 细节层次模型 |
| DOI： |
| 分类号: |
| 基金项目:国家“973”计划项目(2009CB320805);国家“863”计划项目(2009AA01Z333);中国石油大学博士基金项目 |
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| Error metric with roughness of generating LOD of terrain |
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CHEN Guo-jun1,2,CUI Bao-lei1,CHEN Qing-gang1
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(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)
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| 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 |
