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Edge-based identification of DP-features on freeform solids

Lim, T.C. and Medellin, H. and Torres-Sanchez, C. and Corney, J.R. and Ritchie, J.M. and Davies, J.B.C. (2005) Edge-based identification of DP-features on freeform solids. IEEE Transactions on Pattern Analysis and Machine Intelligence, 27 (6). pp. 851-860. ISSN 0162-8828

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Numerous applications in mechanical CAD/CAM need robust algorithms for the identification of protrusion and depression features (DP-features) on geometric models with free-form (B-Spline) surfaces. This paper reports a partitioning algorithm that first identifies the boundary edges of DP-features and then creates a surface patch to cover the depressions or isolate the protrusions. The novelty of the method lies in the use of tangent continuity between edge segments to identify DP-feature boundaries that cross multiple faces and geometries.