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Modeling of 3D Free-Curved Surface in Machine CAD

Wang Fujun; Ye Haijian(College of Water Conservancy and Civil Engineering, CAU) (CAD Center, CAU)  
The 3D surface can be defined directly by the boundary curve of the patch surface.The surface will be C1 continuous if the boundary curves connecting each two patches are C1 continuous. The complex calculation needed to control the parameters of surface can be avoided byusing the models presented in this paper. This new method is not dependent on any of surfacemodelling mechanism in CAD support software. Application examples are given and it has beenshown that this method has a very good universality.
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