An improved algorithm for checking the injectivity of 2D toric surface patches

An improved algorithm for checking the injectivity of 2D toric surface patches
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一种改进的检查二维复曲面面片单射性的算法

DOI:
10.1016/j.camwa.2020.01.001
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发表时间:
2020-01
影响因子:
2.9
通讯作者:
Chungang Zhu
Chungang Zhu
中科院分区:
数学2区
文献类型:
--
作者:
Yingying Yu;Ye Ji;Chungang Zhu

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注入参数化在理论和应用上都有广泛的应用。参数曲线和曲面的注入性意味着不存在自交。环面patch是由一组整数格点a和相应的控制点和权值来定义的,其中特殊情况包括有理张量积和三角形bsamizier patch。2011年,Sottile和Zhu提出了一种几何方法来检测二维环形表面斑块的注入性。在本文中,我们提出了一种改进算法。改进算法的复杂度从O (n 3)降低到O (n 2),其中n=#(A)。算例说明了算法的有效性。此外,该算法还用于等几何分析中参数化的注入性检验。
Injective parametrizations are widely used both in theory and in applications. The injectivity of parameteric curves and surfaces means that there are no self-intersections. Toric surface patch is defined by a set of integer lattice points A and corresponding control points and weights, which includes rational tensor product and triangle Bézier patches as special cases. In 2011, Sottile and Zhu presented a geometric method to check the injectivity of 2D toric surface patches. In this paper, we present an improved algorithm of their method. The complexity of the improved algorithm is reduced from O (n 3) to O (n 2), where n=#(A). Some examples are shown to illustrate the effectiveness of our algorithm. Moreover, the algorithm is also applied to check the injectivity of parameterization in isogeometric analysis.
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