特征编辑技术的研究

RESEARCH ON FEATURE EDITING TECHNOLOGY

特征编辑已成为特征造型系统中提高造型能力和造型效率的关键，为此文中提出重用ＣＳＧ和ＦＤＴ的特征线性修改算法， 且与模型构造的历程顺序无关．同时在特征编辑中满足面特征、体特征设计的前提假设条件下，提出特征非线性修改算法，最大限度地减少了模型重构过程所需布尔运算的操作步骤，因而解决了随着模型复杂程度提高，修改所花费的时间越多的问题．并给出了特征线性修改与非线性修改有机结合的算法。

Feature editing has become a key approach for improving ability and efficiency of modeling in feature\|based solid modeling. So, based on reusable CSG and FDT technologies, a feature linear modifying algorithm is presented, which is independent of the sequential history of modeling steps. Meanwhile, a nonlinear modifying algorithm that satisfies the assumptions of face\|based and volume\|based feature design is proposed in feature editing, which can re\|evaluate a modified part with minimum Boolean operations, thus solving the problem that a part modification's time will cost more with a more complicated structure. An algorithm of combining features linear modifying with nonlinear modifying is given to improve the stability and efficiency of feature editing.