形状特征的表示

A Representation of Form Features

本文阐述了面向对象的形状特征表示方法与原型现实所具有的特点：严格服从特征定义，突出边界模型的定义；考虑了语义几何元素和特征隐含约束集的表示；借语义几何元素来表达从属特征；注意特征分类的现实性，允许用户任意地定义形状特征（因为实践中尚未形成严格的分类体系）．

An object-oriented representation and implementation of form features are introduced in this paper. The proposed scheme has the properties : (1)being based on a formallied featUre definition, (2)taking into account the geometric elements like centreline, bottom face and implicit constraints of features, (3)representing secondary features in a context-free way,(4)pendting the users to define their own featUre classes (since there is no well-accepted feature taxonomy at present).