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To identify different entities between two solid models with minor difference is a key issue in many research fields. Most of the existing approaches on this field are either not general enough for handling general CAD models, or are of low efficiency by using global comparison. In this paper, a novel different entity identification approach is proposed based on a novel concept of common primary subparts and using the associated attributed graphs with the two models. Identification efficiency is achieved by first classifying graph nodes (model faces) into the groups based on their underlying surfaces and face senses. By detecting common attributed subgraphs from the attributed graphs of the two models, all typical different entities can then be locally identified in the process of eliminating common attributed subgraphs. The left subgraphs are then further checked for finding other unusual different entities. Preliminary experiment results show that the proposed approach can not only find out all different entities, but also achieve high computational efficiency as compared with previous work. © 2011 CAD Solutions, LLC.

Identifying Different Entities for Minor Model Modification Based on Common Primary Subpart