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Converting Hybrid Wire-frames to B-rep Models

Abstract : Solid reconstruction from engineering drawings is one of the efficient technologies to product solid models. The B-rep oriented approach provides a practical way for reconstructing a wide range of objects. However, its major limitation is the computational complexity involved in the search for all valid faces from the intermediate wire-frame, especially for objects with complicated face topologies. In previous work, we presented a hint-based algorithm to recognize quadric surfaces from orthographic views and generate a hybrid wire-frame as the intermediate model of our B-rep oriented method. As a key stage in the process of solid reconstructing, we propose an algorithm to convert the hybrid wire-frame to the final B-rep model by extracting all the rest faces of planes based on graph theory. The entities lying on the same planar surface are first collected in a plane graph. After all the cycles are traced in a simplified edge-adjacency matrix of the graph, the face loops of the plane are formed by testing loop containment and assigning loop directions. Finally, the B-rep model is constructed by sewing all the plane faces based on the M¨obius rule. The method can efficiently construct 2-manifold objects with a variety of face topologies, which is illustrated by results of implementation.
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Submitted on : Tuesday, September 7, 2010 - 11:37:39 AM
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  • HAL Id : inria-00515528, version 1

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Jie-Hui Gong, Hui Zhang, yi-Wen Zhang, Jia-Guang Sun. Converting Hybrid Wire-frames to B-rep Models. ACM Symposium on Solid and Physical Modeling (SPM2007), Jun 2007, Beijing, China. ⟨inria-00515528⟩

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