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arXiv 1601.01436math.NAcs.NA
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通过复合参数曲面实现高质量的局部插值

High quality local interpolation by composite parametric surfaces

University of Padova(帕多瓦大学);University of Bologna(博洛尼亚大学)

Michele Antonelli, Carolina Vittoria Beccari, Giulio Casciola

AI总结:

本文提出了一种能够高光滑度和高质量插值任意拓扑四边形网格的参数曲面构造方法,通过非均匀参数化避免插值中的振荡和形状伪影。

摘要:

在CAD中,设计能插值任意四边形网格的曲面是一项具有挑战性的任务。基本要求是满足曲面的光滑性和审美概念。在单变量情况下,通过适当的非均匀参数化可以克服或缓解数据点不均匀分布导致的形状伪影问题。最近,这一原理已被推广并证明在双变量插值细分方案中有效。本文提出了一种构造高质量审美质量和高光滑度的参数曲面的方法,能够插值任意拓扑的四边形网格。在经典张量积设置中,同一参数区间必须被整个行或列的网格边共享。相反,在本文中,我们为每个网格边分配不同的参数区间。这种特定结构称为增强参数化,使我们能够以防止曲线振荡或其他插值伪影的参数值插值每个网格的节段多项式。这产生高质量的插值曲面。所提出的曲面是Beccari等人(2013)和Antonelli等人(2014)引入的局部单变量样条插值的推广,可以具有任意连续性和任意多项式再现阶次。特别是,这些曲面在网格的常规区域中保留了底层单变量样条类的相同光滑度。此外,在包含非4度顶点的网格区域中,我们适当地定义G1或G2连续的曲面片,以连接相邻的常规曲面片。

英文摘要:

In CAGD the design of a surface that interpolates an arbitrary quadrilateral mesh is definitely a challenging task. The basic requirement is to satisfy both criteria concerning the regularity of the surface and aesthetic concepts. With regard to the aesthetic quality, it is well known that interpolatory methods often produce shape artifacts when the data points are unevenly spaced. In the univariate setting, this problem can be overcome, or at least mitigated, by exploiting a proper non-uniform parametrization, that accounts for the geometry of the data. Moreover, recently, the same principle has been generalized and proven to be effective in the context of bivariate interpolatory subdivision schemes. In this paper, we propose a construction for parametric surfaces of good aesthetic quality and high smoothness that interpolate quadrilateral meshes of arbitrary topology. In the classical tensor product setting the same parameter interval must be shared by an entire row or column of mesh edges. Conversely, in this paper, we assign a different parameter interval to each edge of the mesh. This particular structure, which we call an augmented parametrization, allows us to interpolate each section polyline of the mesh at parameters values that prevent wiggling of the resulting curve or other interpolation artifacts. This yields high quality interpolatory surfaces. The proposed surfaces are a generalization of the local univariate spline interpolants introduced in Beccari et al.(2013) and Antonelli et al.(2014), that can have arbitrary continuity and arbitrary order of polynomial reproduction. In particular, these surfaces retain the same smoothness of the underlying class of univariate splines in the regular regions of the mesh. Moreover, in mesh regions containing vertices of valence other than 4, we suitably define G1- or G2-continuous surface patches that join the neighboring regular ones.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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