基于B-REP的CAD模型与VR模型接口的实现  

Realization of Interface Between B-Rep-based CAD Model and VR Model

作　　者：罗显光[1,2] 李爱平[1] 刘雪梅[1] 李军[1] 

机构地区：[1]同济大学现代制造技术研究所,上海200092 [2]湘潭大学机械工程学院,湘潭411105

出　　处：《系统仿真学报》2009年第6期1647-1650,共4页Journal of System Simulation

基　　金：上海市“十一五”重大科技攻关项目(06DZ11310);上海市科委项目(71111005)

摘　　要：复杂CAD模型利用现有数据接口向VR模型转换存在面片数过多,不能满足在虚拟环境下实时性要求。在保证模型精度前提下,为减少面片数目,提出了基于B-Rep表示CAD模型的边界上点数据提取方法;实现平面多连通区域转化为单连通区域算法;利用uv平面搜索得到曲面上点数据及其排列顺序快速实现曲面三角化,改变边界上点的数目可生成多LOD模型,实验验证了算法具有可行性。Too many polygon faces were produced if complicated cad model converts to virtual reality model making use of the current data interface,it failed to meet with the real time requirement in virtual reality environment.In order to decreasing the number of the polygon faces at a proper precision of geometry model,the method was introduced to get the points data at the boundaries in the B-rep based cad model and realizing the algorithm from multi-loop plane regions to single loop regions;surface triangulation was realized by getting the points data and their turns in the uv parameter region of the surface.LOD model can be created by changing the number of the points on the edge of CAD model.The algorithm has good effect in practice.

关 键 词：CAD 虚拟现实 边界表示 Delauncy三角化 

分 类 号：TP319.9[自动化与计算机技术—计算机软件与理论]