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This paper proposes two surface fitting methods, one is direct surface fitting method and the other is a method, which mixes polynomial and interpolation to get fitting curve and then generate the fitting surface. The engine universal characteristic curve can be drawn using iso-line method from the given surface. The two methods cannot only be effective,(More)
This paper proposed a new preprocessing method for the reconstruction of three dimensional shapes from a practical engineering drawing which clarify the entities in the drawing and construct an efficient data structure to express the topology relationships among endpoints and edges. For dealing with non standard three-view drawing, a new(More)
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