基于点删除的地形TIN连续LOD模型的建立和实时动态显示

Constitution & Dynamic Display for Series LOD Model of TIN Terrain by Deleting Vertices

摘要: 介绍了一种对于地形不规则三角网(TIN)建立层次细节(LOD)模型和实时动态显示的方法。按照给定的条件通过重复执行顶点删除和局部三角化,对TIN中的点和三角形数据结构进行调整,建立地形TIN的连续LOD模型。在显示的过程中,根据视点的远近从上述LOD模型自适应地获取和显示所需三角形,实现地形TIN的实时动态显示。

Abstract: A new method is presented for constitution of series LOD model of TIN terrain and dynamic display.The method is divided into two steps.One is to setup the series LOD model of TIN terrain by deleting vertices.On the basis of modification of data-structure,we record all information of points and triangles along the simplification of TIN.The other is to dynamic display based on the distance between viewpoint and viewer.