Yufei LI - 李宇飞

Post-Doctoral Fellow
Advisor: Prof. Wenping Wang
Computer Graphics Group
Department of Computer Science
The University of Hong Kong

Contact Information
Email: yfli (at) cs.hku.hk
Tel: (852) 2857 8454
Fax: (852) 2549 7908

Room 401, Chow Yei Ching Building,
The University of Hong Kong,
Pokfulam Road, Hong Kong

  • Ph.D. Sep. 2006 - Sep. 2012, Department of Computer Science, The University of Hong Kong (HKU), Hong Kong.
  • B.E. Sep. 2002 - Jul. 2006, Department of Automation, The University of Science and Technology of China (USTC), Hefei, China.
Research Interests
  • Computer Graphics
  • Geometric Modeling and Optimization
  • Architectural Geometry

All-Hex Meshing using Singularity-Restricted Field (pdf)(slides)

Yufei Li, Yang Liu, Weiwei Xu, Wenping Wang, Baining Guo

ACM Transactions on Graphics (SIGGRAPH Asia 2012), 31(6).

Decomposing a volume into high-quality hexahedral cells is a challenging task in geometric modeling and computational geometry. Inspired by the use of cross field in quad meshing and the CubeCover approach in hex meshing, we present a complete all-hex meshing framework based on singularity-restricted field that is essential to induce a valid all-hex structure. Given a volume represented by a tetrahedral mesh, we first compute a boundary-aligned 3D frame field inside it, then convert the frame field to be singularity-restricted by our effective topological operations. In our all-hex meshing framework, we apply the CubeCover method to achieve the volume parametrization. For reducing degenerate elements appearing in the volume parametrization, we also propose novel tetrahedral split operations to preprocess singularity-restricted frame fields. Experimental results show that our algorithm generates high-quality all-hex meshes from a variety of 3D volumes robustly and efficiently.

Shape Optimization of Quad Mesh Elements (pdf)(slides)

Yufei Li, Wenping Wang, Ruotian Ling, Changhe Tu

Computers & Graphics, Volume 35, Issue 3, Pages: 444-451
(SMI 2011 - Shape Modeling International 2011)

We study the problem of optimizing the face elements of a quad mesh surface, that is, resampling a given quad mesh to make it possess, as much as possible, face elements of some desired aspect ratio and size. Unlike previous quad mesh optimization/improvement methods based on local operations on a small group of elements, we adopt a global approach that does not introduce extra singularities and therefore preserves the original quad structure of the input mesh. Starting from a collection of quad patches extracted from an input quad mesh, two global operations, i.e. resampling and re-distribution, are performed to optimize the number and spacings of grid lines in each patch. Both operations are formulated as simple optimization problems with linear constraints.

Optimal Sampling of Parametric Surfaces (pdf)(slides)

Yufei Li, Wenping Wang, Changhe Tu

Computer-Aided Design and Applications, Volume 9, Number 1, Pages: 55-60
(CAD Conference and Exhibition 2011)

We study the problem of optimally sampling parametric surfaces by means of reparameterization. A criterion is first formulated for measuring the parameterization quality of a given surface. According to this criterion, the optimal parameterization is identified for the surface by exploring admissible reparameterizations. Then the optimal sampling of the surface is obtained by uniformly sampling the parameter domain of the optimal parameterization.


A Study on Surface and Volume Tiling for Geometric Modeling (pdf)

Yufei Li, PhD Thesis, Department of Computer Science, The University of Hong Kong, September, 2012.

  • Teaching assistant, [CSIS8301] Advanced Topics in Computer Systems at HKU, 2009.
  • Teaching assistant, [CSIS8502] Advanced Topics in Pattern Recognition at HKU, 2009.
  • Teaching assistant, [CSIS0270] Artificial Intelligence, CS Dept, HKU, 2008.
  • Teaching assistant, [CSIS0270] Artificial Intelligence, CS Dept, HKU, 2007.