基于复杂工程图的三维造型草图生成算法

提出一种基于复杂工程图的快速三维草图生成算法，以及一种视图选择分割子算法。该子算法不仅结合了主流三种分割算法的优点，对视图分割具有选择性和次序性，而且最多四次分割就能达到对复杂工程图彻底分割的目的。改进的角度判别法进一步提高了算法的整体效率。最终通过实例验证，可处理现有CAD软件对二维图的导入，提高了三维几何造型的效率。

An Algorithm on 3D Modeling Sketch Creation of Complex Engineering Drawing

An algorithm on 3D Modeling sketch creation of complex engineering drawing is put forward. In the algorithm, the selected view segmentation subalgorithm is proposed. The subalgorithm can not only combine the advantage of three existing mainstream segmentation algorithms and segment view selectively and orderly, but also achieve the purpose of thoroughly partitioning complicated engineering drawing by view partition four times at the most. The improved turn-to-the-left-most rule is presented to enhance the efficiency further. Finally, the examples indicate that the algorithm is effective, can settle some shortcomings which exist when 2D drawing is imported into the existing CAD software and improve the efficiency of 3D geometric model.