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A method of human short hair modeling and real time animation

A method of human short hair modeling and real time animatio...

引用

pacific conference on computer graphics and applications

作者： Yang Guang Huang Zhiyong Volume Interactions Singapore Department of Computer Science School of Computing National University of Singapore Singapore

ISBN: (纸本)0769517846

This paper describes a method of human short hair modeling and real time animation. A method is proposed to model short hair. First, a hair style model is derived from a scalp model interactively. The hair model is then derived automatically from the hair style and scalp models. Texture mapping is applied to the hair model for a better visual effect. For animation, a method is proposed based on an approximation of the accurate physically-based hair model, from which 3D morphing key shapes are derived. Intermediate shapes are then computed by applying 3D morphing. We have implemented it and compared the results with real hair. The visual quality and frame rate are satisfactory for real time applications.

关键词： Humans Hair Animation Shape Scalp Visual effects Strips Fluid dynamics computer science Deformable models

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A 3-D string figure display system for animating cat's cradle game

A 3-D string figure display system for animating cat's cradl...

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pacific conference on computer graphics and applications

作者： R. Budiarto M. Yamada H. Seki H. Itoh Department of AI & Computer Science Nagoya Institute of Technology Nagoya Japan

Implements a display system for cat's cradle game animation in 3D. The input to our system, finger actions, originates from a user. Based on this input, we animate the finger actions and display an operated pattern of string figures. A stabilizing procedure is in charge of obtaining a stable state of the string figures. Processing string figures on a computer is difficult, since the string's dynamics are still unknown. Our system uses a set-of-crossings representation method for processing string figures. We employ some local transformations of the string figures to stabilize them. Furthermore, topological characteristics of the string figures can be observed.

关键词： Animation Fingers computer displays Three dimensional displays Shape Artificial intelligence computer science Equations Mice

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Eigenanalysis and continuity of non-uniform Doo-Sabin surfaces

Eigenanalysis and continuity of non-uniform Doo-Sabin surfac...

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pacific conference on computer graphics and applications

作者： Kaihuai Qin Huawei Wang Department of Computer Science & Technology Tsinghua University Beijing China

In computer graphics and computer-aided geometric design, more and more subdivision schemes are being extensively used for free-form surfaces of arbitrary topology. The convergence and continuity analyses of uniform subdivision surfaces have been performed very well, but it is very difficult to prove the convergence and the continuity properties of non-uniform recursive subdivision surfaces (NURSSes, for short) because the subdivision matrix varies at each iteration step. This restricts widespread use of NURSSes, although NURSSes have a lot of advantages over uniform subdivision surfaces. In this paper, the concept of equivalent knot spacing is presented. A new technique for eigenanalysis, convergence and continuity analyses of non-uniform Doo-Sabin surfaces is proposed. Also, an interesting and important fact is found that the subdivision process of nonuniform Doo-Sabin surfaces may diverge sometime.

关键词： Convergence Topology Spline Algorithm design and analysis computer science Surface topography Surface reconstruction Electrical capacitance tomography Performance analysis Clothing

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Radiosity for point-sampled geometry

Radiosity for point-sampled geometry

引用

pacific conference on computer graphics and applications

作者： Y. Dobashi T. Yamamoto T. Nishita Hokkaido University Sapporo Japan University of Tokyo Bunkyo Tokyo Japan

In this paper, we propose a radiosity method for the point-sampled geometry to compute diffuse inter reflection of light. Most traditional radiosity methods subdivide the surfaces of objects into small elements such as quadrilaterals. However, the point-sampled geometry includes no explicit information about surfaces, presenting a difficulty in applying the traditional approach to the point-sampled geometry. The proposed method addresses this problem by computing the inter reflection without reconstructing any surfaces. The method realizes lighting simulations without losing the advantages of the point-sampled geometry.

关键词： Surface reconstruction Finite element methods Computational geometry Information geometry Computational modeling Solid modeling computer graphics Shape Degradation Reflectivity

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Control of feature-point-driven facial animation using a hypothetical face

Control of feature-point-driven facial animation using a hyp...

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pacific conference on computer graphics and applications

作者： Ming-Shing Su Ming-Tat Ko Kuo-Young Cheng Institute of Information Science Academia Sinica Taiwan Department of Computer Science and Information Engineering National Taiwan University Taiwan

ISBN: (纸本)0769508685

A new approach for the generation of feature point-driven facial animation is presented. This approach is based on the construction of a hypothetical face formed by connecting face feature points into a net and representing each facet of the net by a mathematically expressed surface to control the deformation of a real face model. The deformation is controlled by changing both the locations of the feature points and their tangents. The experimental results show that the hypothetical-surface-based method can generate almost identical facial expressions to a real face.

关键词： Facial animation Face recognition Bandwidth Deformable models Teleconferencing Information science computer science Joining processes MPEG 4 Standard Control systems

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An efficient brush model for physically-based 3D painting

An efficient brush model for physically-based 3D painting

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pacific conference on computer graphics and applications

作者： N.S.-H. Chu Chiew-Lan Tai Department of Computer Science Hong Kong University of Science and Technology Kowloon Hong Kong China

This paper presents a novel 3D brush model consisting of a skeleton and a surface, which is deformed through constrained energy minimization. The main advantage of our model over existing ones is in its ability to mimic brush flattening and bristle spreading due to brush bending and lateral friction exerted by the paper surface during the painting process. The ability to recreate such deformations is essential to realistic 3D digital painting simulations, especially in the case of Chinese brush painting and calligraphy. To further increase realism, we also model the plasticity of wetted brushes and the resistance exerted by pores on the paper surface onto the brush tip. Our implementation runs on a consumer-level PC in real-time and produces very realistic results.

关键词： Brushes Painting Deformable models Surface resistance Art Rendering (computer graphics) Spline computer science Skeleton Friction

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Shape-adaptive 3D mesh simplification based on local optimality measurement

Shape-adaptive 3D mesh simplification based on local optimal...

引用

pacific conference on computer graphics and applications

作者： In Kyu Park Sang Wook Lee Sang Uk Lee Multimedia Laboratory Samsung Advanced Institute of Technology Yongin si South Korea Graduate School of Media Communications Sogang University Seoul South Korea School of Electrical Engineering Seoul National University Seoul South Korea

ISBN: (纸本)0769517846

Mesh simplification is the process of reducing the number of triangles in a mesh representation of object surface. For a given level of detail or error tolerance, the conventional mesh simplification algorithms maximize the edge length globally, without explicitly considering the local object shape. In this paper we present a shape-adaptive mesh simplification algorithm that locally maximizes the edge length, depending on the local shape. The proposed algorithm achieves shape-adaptive simplification by iteratively maximizing edges between vertices, based on a comparison with the "optimal" edge lengths derived from local directional curvatures for a given error tolerance.

关键词： Shape measurement Iterative algorithms computer graphics computer errors computer vision Mesh generation Design automation Laser modes Rendering (computer graphics) Pipelines

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Exact computation of 4-D convex hulls with perturbation and acceleration

Exact computation of 4-D convex hulls with perturbation and ...

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pacific conference on computer graphics and applications

作者： K. Sugihara Department of Mathematical Engineering and Information Physics University of Tokyo Bunkyo Tokyo Japan

An incremental algorithm for constructing the four-dimensional convex hull is implemented using exact arithmetic together with the symbolic perturbation technique. Exact judgement of the topological structure of the four-dimensional convex hull requires about four times higher precision than the input. To decrease this computational cost, the lazy evaluation scheme is used. Experiments show that the computation can be accelerated more than one hundred times for nondegenerate input and more than three times even for highly degenerate input.

关键词： Acceleration Floating-point arithmetic Computational efficiency Perturbation methods Software computer errors Switches Physics computing Cost accounting Computational geometry

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Mesh modelling with curve analogies

Mesh modelling with curve analogies

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pacific conference on computer graphics and applications

作者： S. Zelinka M. Garland Thomas M. Siebel Center for Computer Science University of Illinois Urbana-Champaign Urbana-Champaign IL USA

Modelling by analogy has become a powerful paradigm for editing images. Using a pair of before- and after-example images of a transformation, a system that models by analogy produces analogous transformations on arbitrary new images. This paper brings the expressive power of modelling by analogy to meshes. To avoid the difficulty of specifying fully 3D example meshes, we use curve analogies to produce changes in meshes. We apply analogies to families of curves on an object's surface, and use the filtered curves to drive a transformation of the object. We demonstrate a range of filters, from simple local feature elimination/addition, to more general frequency enhancement filters.

关键词： Power system modeling Frequency computer graphics computer science Animation Level set Matched filters Application software Image processing Filtering

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Efficient Spherical Harmonics Representation of 3D Objects

Efficient Spherical Harmonics Representation of 3D Objects

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pacific conference on computer graphics and applications

作者： Mohamed-Hamed Mousa Raphaelle Chaine Samir Akkouche Eric Galin Bernard University Lyon France

In this paper, we present a new and efficient spherical harmonics decomposition for spherical functions defining 3D triangulated objects. Such spherical functions are intrinsically associated to star-shaped objects. However, our results can be extended to any triangular object after segmentation into star-shaped surface patches and recomposition of the results in the implicit framework. There is thus no restriction about the genus number of the object. We demonstrate that the evaluation of the spherical harmonics coefficients can be performed by a Monte Carlo integration over the edges, which makes the computation more accurate and faster than previous techniques, and provides a better control over the precision error in contrast to the voxel-based methods. We present several applications of our research, including fast spectral surface reconstruction from point clouds, local surface smoothing and interactive geometric texture transfer.

关键词： Power harmonic filters Clouds Surface reconstruction computer graphics Application software Error correction Shape Filtering Grid computing Discrete transforms

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