基于静态LOD的输电线路虚拟地形渲染优化算法

针对输电线路三维可视化系统中大规模地形场景的渲染问题，提出一种基于静态LOD的虚拟地形绘制优化算法. 建立输电线路廊道内地形高程数据的分块模型，将视角移动速度纳入细节层级的评价因子中，结合视点距离、地形复杂度等因素改进评价函数. 通过阈值判断网格内数据点高程值的方差，选择不同的线性插值函数完成地形曲面的模拟效果. 实验结果表明所提算法有效减少了运动状态下地形三角面的绘制数，具有更加流畅的虚拟场景帧数和良好的地形仿真效果.

Virtual Terrain Rendering Optimization Algorithm for Transmission Line Based on Static LOD

Aiming at the problem of large scale terrain rendering in 3D visualization system of transmission line, a virtual terrain rendering algorithm based on static LOD is proposed. Firstly, the model of terrain elevation data in transmission line corridor is established. The viewing angle is moved into the evaluation factor at the detail level. And the evaluation function is improved by combining the view distance and terrain complexity. On this basis, the variance of the elevation values of the data points in the grid is determined by the threshold value. Different linear interpolation functions are used to simulate the terrain surface. The experimental results show that the proposed algorithm can effectively reduce the number of terrain triangles in motion. The virtual scene frame is more smooth and has a good effect of terrain simulation.