Feature validity maintaining based-on local feature recognition

摘要

Lack of feature validity maintenance function is recognized as a serious problem with current feature modeling system, which makes feature modeling just like an advanced geometric modeling with parametric and constraint-based modeling facilities. In this paper, we present a novel approach to feature validity maintaining. The approach detects the topologically destroyed features and determine the new states of the destroyed features by performing local feature recognition on the area of the part which consists of all the boundary entities of the edited feature and the features intersecting with the edited feature after a feature is edited. In the approach, feature conversion and feature mergence are distinguished from the real destruction of feature validity to let the user have chances to determine if the feature conversion or feature mergence is what he/she wants. To make the implementation of the approach easy, a representation for topologic validity conditions based on the extended attributed adjacency graph is adopted.