CAD模型表面区域分割方法  

An Approach to Surface Region Decomposition for CAD Models

作　　者：马露杰[1] 黄正东[1] 梁良[1] 郑坛光[1] 

机构地区：[1]华中科技大学国家CAD支撑软件工程技术研究中心,武汉430074

出　　处：《计算机辅助设计与图形学学报》2009年第2期148-153,共6页Journal of Computer-Aided Design & Computer Graphics

基　　金：国家自然科学基金(60573178);国家"八六三"高技术研究发展计划(2007AA04Z136)

摘　　要：三维模型表面区域分割技术在形状分析,尤其是局部形状分析中具有重要作用,传统的表面分割方法主要针对网格模型,而机械工程中的CAD模型通常用B-rep表达.提出一种B-rep形式的CAD模型表面区域分割方法,将模型表面划分为局部凸区域、凹区域和平区域的组合,并使得分割后的区域数量最少.为提高计算效率,提出一种二步法:首先在模型面的局部凸凹性分析的基础上,快速地将模型表面分割成初始的凸区域、凹区域和平区域;然后通过区域合并的方法对分割后的区域进行组合优化,得到一个最优的分割结果.实验结果证明,该方法能有效地分割模型的表面区域.Surface region decomposition of 3D models is important for shape analysis, especially local shape analysis. Traditional region decomposition methods are mostly based on mesh models not general CAD models in mechanical engineering. So, a surface region decomposition method is proposed for CAD models with boundary representations, with which the surface boundary of a solid model is divided into local convex, concave and planar regions with the minimal number. To achieve high computation efficiency, a two-pass decomposition approach is used. First, based on the classification of faces according to their local convexity, a surface boundary is initially divided into convex, concave and planar regions. Then, the decomposed regions are recursively combined to form the optimal region decomposition. Experimental results show that this approach can effectively decompose the surface boundary of CAD models.

关 键 词：B-REP模型 区域分割 优化 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]