Selective Padding for Polycube-based Hexahedral Meshing

Cherchi, G.; Alliez, P.; Scateni, R.; Lyon, M.; Bommes, D. (2019). Selective Padding for Polycube-based Hexahedral Meshing. Computer graphics forum, 38(1), pp. 580-591. Wiley 10.1111/cgf.13593

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Hexahedral meshes generated from polycube mapping often exhibit a low number of singularities but also poor quality elements located near the surface. It is thus necessary to improve the overall mesh quality, in terms of the minimum Scaled Jacobian (MSJ) or average Scaled Jacobian (ASJ). Improving the quality may be obtained via global padding (or pillowing), which pushes the singularities inside by adding an extra layer of hexahedra on the entire domain boundary. Such a global padding operation suffers from a large increase of complexity, with unnecessary hexahedra added. In addition, the quality of elements near the boundary may decrease. We propose a novel optimization method which inserts sheets of hexahedra so as to perform selective padding, where it is most needed for improving the mesh quality. A sheet can pad part of the domain boundary, traverse the domain and form singularities. Our global formulation, based on solving a binary problem, enables us to control the balance between quality improvement, increase of complexity and number of singularities. We show in a series of experiments that our approach increases the MSJ value and preserves (or even improves) the ASJ, while adding fewer hexahedra than global padding.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Institute of Computer Science (INF)

UniBE Contributor:

Bommes, David

Subjects:

000 Computer science, knowledge & systems
500 Science > 510 Mathematics

ISSN:

0167-7055

Publisher:

Wiley

Language:

English

Submitter:

Nicolas Gallego Ortiz

Date Deposited:

08 Apr 2020 16:30

Last Modified:

08 Apr 2020 16:30

Publisher DOI:

10.1111/cgf.13593

BORIS DOI:

10.7892/boris.142370

URI:

https://boris.unibe.ch/id/eprint/142370

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