This paper mainly discusses the following aspects : the creation method of irregular triangular network from regular grids, fast computing method of vertex normals in tins, the creation method of multiresolution terrain models and method of view-dependent real-time rendering 本文具体研究内容集中于基于规则格网的不规则三角网生成算法、不规则三角网顶点法矢量的快速计算方法、多分辨率地形模型的构造方法和视点相关的实时绘制方法。
Using latest visual software idl ( interactive data language ) and combining trigrid function with triangulate function in idl, regular network terrain model and 3-d shallow and deep sliding surface model of zhafangping landslide body based on delaunay triangular network is set up . it makes the sliding surface turn from " recessiveness " into " dominance ", and gets numerous different three-dimensional cubic chart, contour topographic map, the combine model of terrain model and contour topo-graphic map . and every visual model has analysed and compared in detail 利用可视化软件idl中的triangulate函数和trigrid函数相结合,建立了基于delaunay三角网的榨坊坪滑坡体规则格网地面模型和浅层、深层滑动面三维可视化模型,实现了该滑坡体的三维模拟与再现,使滑动面由“隐性”变为了“显性”,且获得了众多不同角度的三维立体图、等高线地形图和地面模型与等高线地形图的组合图等,并对各可视化模型进行了详细地分析与比较。