Variationally Improved Bézier Surfaces with Shifted Knots
The Plateau-Bézier problem with shifted knots is to find the surface of minimal area amongst all the Bézier surfaces with shifted knots spanned by the admitted boundary. Instead of variational minimization of usual area functional, the quasi-minimal Bézier surface with shifted knots is obtained as t...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2021-01-01
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| Series: | Advances in Mathematical Physics |
| Online Access: | http://dx.doi.org/10.1155/2021/9978633 |
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| author | Daud Ahmad Kanwal Hassan M. Khalid Mahmood Javaid Ali Ilyas Khan M. Fayz-Al-Asad |
| author_facet | Daud Ahmad Kanwal Hassan M. Khalid Mahmood Javaid Ali Ilyas Khan M. Fayz-Al-Asad |
| author_sort | Daud Ahmad |
| collection | DOAJ |
| description | The Plateau-Bézier problem with shifted knots is to find the surface of minimal area amongst all the Bézier surfaces with shifted knots spanned by the admitted boundary. Instead of variational minimization of usual area functional, the quasi-minimal Bézier surface with shifted knots is obtained as the solution of variational minimization of Dirichlet functional that turns up as the sum of two integrals and the vanishing condition gives us the system of linear algebraic constraints on the control points. The coefficients of these control points bear symmetry for the pair of summation indices as well as for the pair of free indices. These linear constraints are then solved for unknown interior control points in terms of given boundary control points to get quasi-minimal Bézier surface with shifted knots. The functional gradient of the surface gives possible candidate functions as the minimizers of the aforementioned Dirichlet functional; when solved for unknown interior control points, it results in a surface of minimal area called quasi-minimal Bézier surface. In particular, it is implemented on a biquadratic Bézier surface by expressing the unknown control point P11 as the linear combination of the known control points in this case. This can be implemented to Bézier surfaces with shifted knots of higher degree, as well if desired. |
| format | Article |
| id | doaj-art-b694c6d497ec4312825fd65e0f61c062 |
| institution | Kabale University |
| issn | 1687-9120 1687-9139 |
| language | English |
| publishDate | 2021-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Mathematical Physics |
| spelling | doaj-art-b694c6d497ec4312825fd65e0f61c0622025-02-03T01:24:59ZengWileyAdvances in Mathematical Physics1687-91201687-91392021-01-01202110.1155/2021/99786339978633Variationally Improved Bézier Surfaces with Shifted KnotsDaud Ahmad0Kanwal Hassan1M. Khalid Mahmood2Javaid Ali3Ilyas Khan4M. Fayz-Al-Asad5Department of Mathematics, University of the Punjab, Lahore, PakistanDepartment of Mathematics, University of the Punjab, Lahore, PakistanDepartment of Mathematics, University of the Punjab, Lahore, PakistanDepartment of Mathematics, Govt. College Township, Affiliated Institute of University of the Punjab, Lahore, PakistanDepartment of Mathematics, College of Science Al-Zulfi, Majmaah University, Al-Majmaah 11952, Saudi ArabiaBangladesh University of Engineering and Technology (BUET), Dhaka 1000, BangladeshThe Plateau-Bézier problem with shifted knots is to find the surface of minimal area amongst all the Bézier surfaces with shifted knots spanned by the admitted boundary. Instead of variational minimization of usual area functional, the quasi-minimal Bézier surface with shifted knots is obtained as the solution of variational minimization of Dirichlet functional that turns up as the sum of two integrals and the vanishing condition gives us the system of linear algebraic constraints on the control points. The coefficients of these control points bear symmetry for the pair of summation indices as well as for the pair of free indices. These linear constraints are then solved for unknown interior control points in terms of given boundary control points to get quasi-minimal Bézier surface with shifted knots. The functional gradient of the surface gives possible candidate functions as the minimizers of the aforementioned Dirichlet functional; when solved for unknown interior control points, it results in a surface of minimal area called quasi-minimal Bézier surface. In particular, it is implemented on a biquadratic Bézier surface by expressing the unknown control point P11 as the linear combination of the known control points in this case. This can be implemented to Bézier surfaces with shifted knots of higher degree, as well if desired.http://dx.doi.org/10.1155/2021/9978633 |
| spellingShingle | Daud Ahmad Kanwal Hassan M. Khalid Mahmood Javaid Ali Ilyas Khan M. Fayz-Al-Asad Variationally Improved Bézier Surfaces with Shifted Knots Advances in Mathematical Physics |
| title | Variationally Improved Bézier Surfaces with Shifted Knots |
| title_full | Variationally Improved Bézier Surfaces with Shifted Knots |
| title_fullStr | Variationally Improved Bézier Surfaces with Shifted Knots |
| title_full_unstemmed | Variationally Improved Bézier Surfaces with Shifted Knots |
| title_short | Variationally Improved Bézier Surfaces with Shifted Knots |
| title_sort | variationally improved bezier surfaces with shifted knots |
| url | http://dx.doi.org/10.1155/2021/9978633 |
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