Weiyin Ma

City University of Hong Kong

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Xiao-Diao Chen

Hangzhou Dianzi University

Zongmin Ma

University of Massachusetts Lowell

Chongyang Deng

Hangzhou Dianzi University

Wenjun Zhang

University of Saskatchewan

Patri K. Venuvinod

City University of Hong Kong

Yongmin Zhong

RMIT University

Guiqing Li

South China University of Technology

Meie Fang

Guangzhou University

Ren-Jiang Zhang

Zhejiang Gongshang University

Bijan Shirinzadeh

Monash University

Cooperative Institutions

Hangzhou Dianzi University

City University of Hong Kong

Zhejiang University

Shanghai Jiao Tong University

Chinese Academy of Sciences

University of Chinese Academy of Sciences

University of Electronic Science and Technology of China

University of Hong Kong

Shandong University

Tsinghua University

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An efficient method for modelling soft tissue in Virtual Environment training systems

Studies in health technology and informatics (2001)

Weiyin Ma Chapman Peter M

Modelling soft tissues in virtual environment training systems is frequently required. The provision of both visually compelling and physically accurate models presents a number of problems for the developer. The Finite element technique presented in this paper, modal analysis, can be programmed to allow the user to easily trade-off accuracy of simulation for execution speed. It has been successfully used to produce simulations of the lateral meniscus on low powered portable computer systems.

10.3233/978-1-60750-925-7-570

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Assembly Modelling Through Constraint-based Manipulations in A Virtual Reality Environment

Yongmin Zhong Bijan Shirinzadeh Weiyin Ma Hwee Choo Liaw

With today's virtual reality (VR) systems, it is difficult to create precise assembly models through 3D interactions due to hardware limitations. In this paper, an efficient approach is presented for intuitive and precise assembly modeling in a VR environment. Assembly modelling is performed by precise constraint-based 3D direct manipulations in an intuitive manner. Constraint-based manipulations are accompanied with automatic constraint recognition and precise constraint satisfaction, and are realized by allowable motions for precise 3D interactions in the VR environment. Some special constraint-based assembly operations are constructed for assembly modelling in the VR environment. A method for recognizing the pairs of mating features between assembly components is presented. This method integrates 3D direct manipulations with a feature mating knowledge base and makes the process of recognizing a pair of mating features intuitive. A concept of offset solid is also presented for determining assembly components. A prototype system has been developed for assembly modelling through precise constraint-based manipulations in an intuitive manner in the VR environment.

Feature (linguistics)

10.1109/tencon.2005.301317

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Citations (4)

A Method for Constructing Interpolatory Subdivision Schemes and Blending Subdivisions

Computer Graphics Forum (2007)

Guoqiang Li Weiyin Ma

Abstract This paper presents a universal method for constructing interpolatory subdivision schemes from known approximatory subdivisions. The method establishes geometric rules of the associated interpolatory subdivision through addition of further weighted averaging operations to the approximatory subdivision. The paper thus provides a novel approach for designing new interpolatory subdivision schemes. In addition, a family of subdivision surfaces varying from the given approximatory scheme to its associated interpolatory scheme, namely the blending subdivisions, can also be established. Based on the proposed method, variants of several known interpolatory subdivision schemes are constructed. A new interpolatory subdivision scheme is also developed using the same technique. Brief analysis of a family of blending subdivisions associated with the Loop subdivision scheme demonstrates that this particular family of subdivisions are globally C 1 continuous while maintaining bounded curvature for regular meshes. As a further extension of the blending subdivisions, a volume‐preserving subdivision strategy is also proposed in the paper.

Subdivision surface

10.1111/j.1467-8659.2007.01015.x

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Citations (35)

Solid modelling in a virtual reality environment

The Visual Computer (2005)

Yongmin Zhong Bijan Shirinzadeh Weiyin Ma

Solid modeling

10.1007/s00371-004-0268-9

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Citations (15)

Validation Index for Transactional Clustering

Journal of Pattern Recognition Research (2009)

Piyang Wang Weiyin Ma Tommy W. S. Chow

Close The Journal of Pattern Recognition Research (JPRR) provides an international forum for the electronic publication of high-quality research and industrial experience articles in all areas of pattern recognition, machine learning, and artificial intelligence. JPRR is committed to rigorous yet rapid reviewing. Final versions are published electronically (ISSN 1558-884X) immediately upon acceptance. Submit Manuscript Validation Index for Transactional Clustering Piyang Wang, W. M. Ma, Tommy W. S. Chow JPRR Vol 4, No 1 (2009); doi:10.13176/11.64

10.13176/11.64

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Citations (2)

Adaptive Refinement for Unified Subdivisions with Sharp Features

Computer-Aided Design and Applications (2009)

Guiqing Li Weiyin Ma

We discuss the design and implementation of CAD tools for creating decorative solids that tile 3-space in a regular, isohedral manner.Starting with the simplest case of extruded 2D tilings, we describe geometric algorithms used for maintaining boundary representations of 3D tiles, including a Java implementation of an interactive constrained Delaunay triangulation library and a mesh-cutting algorithm used in layering extruded tiles to create more intricate designs.Finally, we demonstrate a CAD tool for creating 3D tilings that are derived from cubic lattices.The design process for these 3D tiles is more constrained, and hence more difficult, than in the 2D case, and it raises additional user interface issues.

10.3722/cadaps.2009.851-864

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Citations (1)

Interpolatory v2-Subdivision Surfaces.

Guiqing Li Weiyin Ma Hujun Bao

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Citations (4)

Construction of Cubic Triangular Patches with C^1 Continuity around a Corner

Ren-Jiang Zhang Ligang Liu Guojin Wang Weiyin Ma

This paper presents a novel approach for constructing a piecewise triangular cubic polynomial surface with C/sup 1/ continuity around a common corner vertex. A C/sup 1/ continuity condition between two cubic triangular patches is first derived using mixed directional derivatives. An approach for constructing a surface with C/sup 1/ continuity around a corner is then developed. Our approach is easy and fast with the virtue of cubic reproduction, local shape controllability, C/sup 2/ continuous at the corner vertex. Some experimental results are presented to show the applicability and flexibility of the approach.

Cubic function

10.1109/cad-cg.2005.28

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Citations (3)

ReliefNet: Fast Bas-relief Generation from 3D Scenes

Computer-Aided Design (2020)

Zhongping Ji Wei Feng Xianfang Sun Feiwei Qin Yigang Wang

10.1016/j.cad.2020.102928

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Citations (24)

Efficient Piecewise Linear Approximation of Bézier Curves with Improved Sharp Error Bound

Lecture notes in computer science (2006)

Weiyin Ma Ren-Jiang Zhang

Polygon (computer graphics)

10.1007/11802914_12

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Citations (2)