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This study presents a new algorithm of 3D reconstruction to obtain automatically 3D solid from mechanical engineering drawings. Main steps of the algorithm are as follows: first, reconstruct multiple views from dxf-type files; second, recognize primitives feature and combined relationship between primitives by engineering semantics understanding and loops searching on views; third, partition and reconstruct body primitives; last, all reconstructed primitives are assembled into a goal solid by Boolean operation. The algorithm adopts integrated reconstruction techniques to enlarge the figuration domain of reconstructed objects. And it uses case-based reasoning to set up a self-learning mechanism of feature recognition. It is implemented at the desktop of AutoCAD 2004 by using Object ARX 2002 and VC++6.0. The results show that utility scope and reconstruction speed are improved when using the new algorithm.

Study on 3D Solid Reconstruction From 2D Views Based on Intelligent Uunderstanding of Mechanical Engineering Drawings