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Modeling With Ambient Bsplines 1st Edition Nicole Lehmann

  • SKU: BELL-51656072
Modeling With Ambient Bsplines 1st Edition Nicole Lehmann
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Modeling With Ambient Bsplines 1st Edition Nicole Lehmann instant download after payment.

Publisher: Logos Verlag Berlin
File Extension: PDF
File size: 7.44 MB
Pages: 126
Author: Nicole Lehmann
ISBN: 9783832591656, 3832591656
Language: English
Year: 2014
Edition: 1

Product desciption

Modeling With Ambient Bsplines 1st Edition Nicole Lehmann by Nicole Lehmann 9783832591656, 3832591656 instant download after payment.

The present thesis introduces a new approach for the generation of C^{k-approximants of functions defined on closed submanifolds for arbitrary k in N. In case a function on a surface resembles the three coordinates of a topologically equivalent surface in R³, we even obtain C^k-approximants of closed surfaces of arbitrary topology. The key idea of our method is a constant extension of the target function into the submanifold's ambient space.In case the reference submanifolds are embedded and C^k, the usage of standard tensor product B-splines for the approximation of the extended function is straightforward. We obtain a C^k-approximation of the target function by restricting the approximant to the reference submanifold. We illustrate our method by an easy example in R² and verify its practicality by application-oriented examples in R³. The first treats the approximation of the geoid, an important reference magnitude within geodesy and geophysics. The second and third example treat the approximation of geometric models. The usage of B-splines not only guarantees full approximation power but also allows a canonical access to adaptive refinement strategies. We elaborate on two hierarchical techniques and successfully apply them to the introduced examples.Concerning the modeling of surfaces by the new approach, we derive numerically robust formulas for the determination of normal vectors and curvature information of a target surface which only need the spline approximant as well as the normal vectors and curvature information of the reference surface.

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