Journal of South China University of Technology (Natural Science Edition) ›› 2008, Vol. 36 ›› Issue (8): 41-47.

• Electronics, Communication & Automation Technology • Previous Articles     Next Articles

Surface Trimming Operation Based on Catmull-Clark Subdivision

Yuan Hong1  LU Bei-sheng2  Liao Wen-he1   

  1. 1. College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, Jiangsu, China; 2. College of Mechanical Engineering, Northwestern Polytechnical University, Xi＇an 710072, Shaanxi, China
  • Received:2007-09-05 Revised:2007-12-06 Online:2008-08-25 Published:2008-08-25
  • Contact: 袁鸿（1978-），男，博士生，主要从事CAGD／CAD研究． E-mail:yuanhong1979@nuaa．edu．cn
  • About author:袁鸿（1978-），男，博士生，主要从事CAGD／CAD研究．
  • Supported by:

    国防基础科研项目（K1605061115）

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Abstract:

In CAD/CAM engineering, surface trimming is one of the most important and complex problems and quadrangular meshes are widely employed. In this paper, a surface trimming operation based on the Catmull-Clark subdivision is proposed for the quadrangle meshes. In this operation, the topology structure and vertex positions of the control mesh at intersection points are locally modified after the subdivision surface intersection has been finished, thus successfully implementing the surface trimming. The positions of arbitrary point of the control mesh on the subdivision surface are evaluated and the flow and application examples of the trimming algorithm are presented.

Key words: Catmull-Clark subdivision surface, topology structure, surface trimming, control mesh