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Spatial Pythagorean-Hodograph B-Spline curves and 3D point data interpolation

机译:空间Pythagorean-hodograph B样条曲线和3D点数据插值

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This article deals with the spatial counterpart of the recently introduced class of planar Pythagorean-Hodograph (PH) B-Spline curves. Spatial Pythagorean-Hodograph B-Spline curves are odd-degree, non-uniform, parametric spatial B-Spline curves whose arc length is a B-Spline function of the curve parameter and can thus be computed explicitly without numerical quadrature. After giving a general definition for this new class of curves, we exploit quaternion algebra to provide an elegant description of their coordinate components and useful formulae for the construction of their control polygon. We hence consider the interpolation of spatial point data by clamped and closed PH B-Spline curves of arbitrary odd degree and discuss how degree-(2n + 1), C-n-continuous PH B-Spline curves can be computed by optimizing several scale-invariant fairness measures with interpolation constraints. (C) 2020 Elsevier B.V. All rights reserved.
机译:本文涉及最近引入的平面毕达哥兰 - Hodograph(pH)B样条曲线的空间对应物。 空间毕达哥兰语 - HODORAP B样条曲线是奇数,不均匀的参数空间B样条曲线,其电弧长度是曲线参数的B样条函数,因此可以明确计算而没有数值正交。 在为这类新的曲线提供一般定义之后,我们利用四元数代数来提供他们的坐标组件和用于构建控制多边形的有用公式的优雅描述。 因此,考虑通过任意奇数程度的钳位和闭合pH的B样条曲线的空间点数据的插值,并讨论如何通过优化几种规模不变性来计算程度(2n + 1),CN连续的pH B样条曲线曲线 具有插值约束的公平措施。 (c)2020 Elsevier B.V.保留所有权利。

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