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Constraint-Based Virtual Solid Modeling

Journal of Computer Science & Technology 2000年第1期15卷 56-63页

作者：高曙明万华根彭群生 State Key Laboratory of CAd & CG Zhejiang University Hangzhou P.R. China

Constraint-based solid modeling is the kernel part of current CAdsystems. It has been widely used in supporting detailed design and variational design. However, it cannot support early stage design and is not easy-to--use becauseit demands fully detailed input description of a design. To solve these problems,researchers attempt to incorporate virtual reality techniques into geometric modeling systems. This paper presents a novel approach for interactive constraint-basedsolid modeling in a virtual reality environment. The approach allows the designerto construct and edit a constraint-based solid model by direct 3d manipulations,and ensures the created solid model to be precise by recognizing and solving geometric constraints. To effectively support 3d manipulations and change propagation,a new constraint-based solid model is adopted. In the model, besides the normalconstituents of the typical constraint-based solid model, some new attributes likeshape control points, location pattern and explicit shape constraints of a primitiveare defined. Guided by the location pattern, our algorithms for recognizing andsolving location constraints are real-time.

关键词： 3d manipulation solid modeling virtual environment constraint

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dual quaternion based virtual hand interaction modeling

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Science China(Information Sciences) 2013年第3期56卷 27-37页

作者： CHEN WenFeng ZHU ShuJing WAN HuaGen FENG JieQing State Key Laboratory of CAd & CG Zhejiang University

Virtual hands play key roles in three-dimensional interaction in various virtual reality ***,their visual realism has seldom been seriously discussed in the community of human computer interaction,not to mention the challenging balance between their visual/motion realism and real-time *** this paper,a novel approach for virtual hand interaction modeling based on dual quaternion is ***,dual quaternion blending(dQB) is introduced as pseudo muscular layer of our virtual hand model instead of traditional linear blending(LB) and quaternion blending(QB) due to its advantages in muscular deformation.A framework for virtual hand interaction is proposed which supports both gesture interactions and 3d *** results show that our proposed virtual hand interaction model is suitable for most virtual reality applications and achieves good visual/motion realism while maintains real-time performance.

关键词： virtual reality virtual hand interaction dual quaternion gesture interaction 3d manipulation

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