基于静态LOD的输电线路虚拟地形渲染优化算法
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摘要
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.
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.
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.
引文
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11 Chen GY,Du LB,He HJ,et al.Research on key techniques of expendable conductivity temperature depth measuring system.Instrumentation,2015,2(2):18–27.
2杨成顺,杨中亚,黄宵宁.基于资产类模型和空间信息模型的输电线路三维可视化平台.电测与仪表,2015,52(23):122 –128.[doi:10.3969/j.issn.1001-1390.2015.23.022]
3孙凤杰,刘慧娟,陈鹤.输电线路虚拟三维场景建模方法研究与实现.中国电力,2015,48(9):86–89,94.
4麦晓明,陈驰,彭向阳,等.输电线路走廊三维可视化技术和系统设计.中国电力,2015,48(2):98–103.
5夏杰,陈奇.基于静态LOD的海量地形绘制中的接缝算法.计算机工程与设计,2010,31(22):4847–4850.
6李钦,戴树岭,赵永嘉,等.分块LOD大规模地形实时渲染算法.计算机辅助设计与图形学学报,2013,25(5):708–713.
7马彦力.三维GIS大数据量场景快速可视化关键技术研究[硕士学位论文].杭州:浙江大学,2013.
8刘扬,宫阿都,李京.基于数据分层分块的海量三维地形四叉树简化模型.测绘学报,2010,39(4):410–415.
9卢立托,李攀峰,马洪浩.基于GPU的不规则三角网向规则格网数字高程模型转换算法优化.计算机应用,2015,35 (S1):32–34.
10顾春雷,杨漾,朱志春.几种建立DEM模型插值方法精度的交叉验证.测绘与空间地理信息,2011,34(5):99–102.
11 Chen GY,Du LB,He HJ,et al.Research on key techniques of expendable conductivity temperature depth measuring system.Instrumentation,2015,2(2):18–27.