西安理工大学理学院,西安,710048
网络首发:2010-11-10,
纸质出版:2010
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胡钢 1, 秦新强 1, 韩西安 2, 等. 拟三次Bézier曲线曲面的拼接技术[J]. 西安交通大学学报, 2010,44(11):46-50+60.
Continuity Conditions for Cubic Quasi-Bézier Curves and Surfaces[J]. 2010, 44(11): 46-50+60.
针对工程中复杂自由曲线曲面难以用单一曲线曲面来表示的问题
研究了一种带形状参数的拟三次Bézier(三次Q-Bézier)曲线曲面的拼接技术. 在对三次Q-Bézier曲线基函数及其端点性质分析的基础上
给出了两相邻三次Q-Bézier曲线间G
1
、G
2
和C
1
、C
2
拼接的充要条件
运用张量积的方法给出了双三次Q-Bézier曲面的几何模型
同时分析了两相邻双三次Q-Bézier曲面片间G
1
光滑拼接的几何条件
并通过合理地选取形状参数
进一步简化了该曲面的G
1
拼接条件
给出了三次Q-Bézier曲线曲面光滑拼接的几何造型实例. 实例结果表明
所提方法简单、直观、易实现
有效地增强了三次Q-Bézier方法表达复杂曲线曲面的能力
可广泛地应用于工程复杂曲线曲面的造型系统中.
Focusing on the fact that the engineering complex curves or surfaces can not be described by using a single curve or surface
the continuity conditions of cubic quasi-Bézier(cubic Q-Bézier)curves and surfaces with shape parameters are investigated. Following the analysis of basis functions and terminal properties
the necessary and sufficient conditions of G
1
G
2
continuity and C
1
C
2
continuity between two adjacent cubic Q-Bézier curves are proposed. And then
the geometric model of the cubic Q-Bézier surfaces is constructed and the condition of G
1
continuity between two adjacent cubic Q-Bézier surfaces in u and v directions is derived and simplified by choosing the control parameters properly. The modeling examples illustrate that the continuit
y condition of the cubic Q-Bézier curves and surfaces can be widely applied to the complex curves and surfaces modeling system.
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李鹏, 李原, 刘平,等. C-B样条曲线及曲面的光滑拼接与应用 [J]. 西北工业大学学报, 2007,25(6):890-895.
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