![]() The challenge lies in effectiveness towards detecting the instants when geometry–topology inconsistencies occur during push–pull moves. 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. ![]() ![]() However, push-pulling such models is not trivial due to the possible smooth face–face connections in the models. In mechanical design, a substantial part of B-rep models being used are quadric models (composed of linear and quadric surfaces). 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.
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