道路路线三维整体建模方法研究

现有的道路三维建模方法只能实现道路模型与地形模型在外观上的整合,其内部关系是完全割裂的.深入研究了一种建立道路三维整体模型的方法.首先将设计点(特征线)与地形点(特征线)整合,形成原始点(特征线)集合.针对原始点集采用逐点插入算法进行Delaunay三角剖分,再依据约束边将初始三角网调整为约束Delaunay三角网,由此得到外观与内部拓扑关系均为整体的道路三维模型.实践表明,该方法具有整体性好、网形优、速度快的优点.图6,参11.

Study on the integrated building methods for road route 3D model

Current methods for road 3D modeling can only realize the integration of road model and terrain model on appearance,however their inner topological relationships are Absolutely irrelated.In this paper,one of methods for building road 3D integrated model is presented.Firstly,design points and terrain points were merged to form the collect of points needed by modeling,so did design feature lines and terrain feature edges to form constrained edges.Then the incremental insertion algorithm was applied to make the points form standard Delaunay triangular net.Finally,the Delaunay triangular net was adjusted by constraining edges to create constrained Delaunay triangular net.So the road 3D model whose appearance and inner topological relationship were both integrated was created successfully.Applications shows that the method has such advantages as good integrality,nice shape and high speed.6figs.,11refs.