【摘要】 总结了LOD自动生成的一般算法,结合DEM均匀网格模型,以“块”作为地形模型简化的空间单位。结合实际视觉效果中观察点位置和角度对场景细节程度的影响,以一个包含视点视向相关因子的尺度作为简化标准。简化过程中采取稀疏采样的策略,建立了多层次LOD数据模型,有效地简化了地形模型的绘制,提高了生成效率,使得生成的三维地形有较高的可视性和真实感。更多还原

【Abstract】 We summary general algorithms of LOD automatical generation in this paper. Based on DEM uniform grid model, "block" is taken as the space unit of terrain simplification, the effects of viewpoint and view direction are considered and a multi-LOD data model is built automatically generation. The complexity and calculation are greatly reduced, the rendering of the terrain model is simplified effectively, and the efficiency of the terrain generation is improved, which makes the 3D terrain more realistic.更多还原