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Proceedings of CAD'15, 2015, 7-12
Recognition of Depression and Protrusion Features on B-rep Models Based on Virtual Loops

Jiing-Yih Lai, Ming-Hsuan Wang, Yu-Kai Chiu, National Central University
Chia-Hsiang Hsu, Yao-Chen Tsai, Chung-Yi Huang, CoreTech System (Moldex3D) Co., Ltd.

Abstract. Loops are important elements in the B-rep model to link all edges corresponding to faces. It has been shown that loops can be used in feature recognition for identifying depressions or protrusions. In the B-rep model, a loop is basically defined on a face only. Features in 3D CAD models, however, typically lie across multiple faces, which is beyond the data structure of current B-rep model. Therefore, to extend the capability of loops for the use in complex feature recognition, the definition of loops should be expanded and associated feature recognition algorithm should be developed. Most researchers employ the topological relationships of adjacent entities for the recognition of features, such as face adjacency graph and attributed adjacency graph. They all assume that all fillets must be removed before the feature recognition, which is practically difficult because the variety of fillets in real cases is complex. Several studies focus on the recognition of fillets because fillets frequently appear in CAD models and complicate the topological structure of faces. Further studies are also available for the recognition of depression or protrusion features.

Keywords. Virtual Loop, Loop Recognition, Feature Recognition, Blend-face Recognition

DOI: 10.14733/cadconfP.2015.7-12