A robust direct modeling method for quadric B-rep models based on geometry-topology inconsistency tracking

被引:7
作者
Zou, Qiang [1 ]
Feng, Hsi-Yung [2 ]
机构
[1] Zhejiang Univ, State Key Lab Cad & CG, Hangzhou 310058, Peoples R China
[2] Univ British Columbia, Dept Mech Engn, Vancouver, BC V6T 1Z4, Canada
基金
加拿大自然科学与工程研究理事会;
关键词
Computer-aided design; Direct modeling; Robustness issues; G1; Continuity; Geometry– topology inconsistencies;
D O I
10.1007/s00366-021-01416-5
中图分类号
TP39 [计算机的应用];
学科分类号
081203 ; 0835 ;
摘要
Boundary representation (B-rep) model editing plays an essential role in computer-aided design, and has motivated the very recent direct modeling paradigm, which features intuitive push-pull manipulation of the model geometry. In mechanical design, a substantial part of B-rep models being used are quadric models (composed of linear and quadric surfaces). However, push-pulling such models is not trivial due to the possible smooth face-face connections in the models. The major issue is that, during push-pull moves, it is often desirable to preserve these connections for functional, manufacturing, or aesthetic reasons, but this could cause complex inconsistencies between the geometry and topology in the model and lead to robustness issues in updating the model. The challenge lies in effectiveness towards detecting the instants when geometry-topology inconsistencies occur during push-pull moves. This paper proposes a novel reverse detection method to solve the challenge and then, based on it, presents a robust method for push-pull direct modeling while preserving smooth connections. Case studies and comparisons have been conducted to demonstrate the effectiveness of the method.
引用
收藏
页码:3815 / 3830
页数:16
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