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pacific conference on computer graphics and applications

作者： M. Marinov L. Kobbelt Computer Graphics Group RWTH Aachen University Germany

We present an extension of the anisotropic polygonal remeshing technique developed by Alliez et al. (2003). Our algorithm does not rely on a global parameterization of the mesh and therefore is applicable to arbitrary genus surfaces. We show how to exploit the structure of the original mesh in order to perform efficiently the proximity queries required in the line integration phase, thus improving dramatically the scalability and the performance of the original algorithm. Finally, we propose a technique for producing conforming quad-dominant meshes in isotropic regions as well by propagating directional information from the anisotropic regions.

关键词： Anisotropic magnetoresistance computer graphics Application software Mesh generation Piecewise linear approximation Shape Piecewise linear techniques Engine cylinders Solid modeling Rendering (computer graphics)

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Two methods for creating chinese painting

Two methods for creating chinese painting

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pacific conference on computer graphics and applications

作者： Ching Chan E. Akleman Jianer Chen Visualization Sciences Program Texas A and M University USA Department of Computer Science Texas A and M University USA

We present two methods to create realistic Chinese painting. The first method is to create 3D Chinese painting animation using existing software packages. The second method is an expressive paint tool which allows an ... 详细信息

ISBN: (纸本)0769517846

关键词： Painting Brushes Ink Art Visualization Animation computer science Software packages Paints Animals

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Non-photorealistic real-time rendering of characteristic faces

Non-photorealistic real-time rendering of characteristic fac...

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pacific conference on computer graphics and applications

作者： T. Luft O. Deussen Department of Computer and Information Science University of Constance Germany

We propose a system for real-time sketching of human faces. On the basis of a three-dimensional description of a face model, characteristic line strokes are extracted and represented in an artistic way. In order to enrich the results with details that cannot be determined analytically from the model surface and anchor strokes are supplemented interactively and are maintained during animation. Because of the real-time ability of our rendering pipeline the system is suitable for interactive facial animation. Thus, interesting areas of application within the range of the virtual avatars are possible.

关键词： Facial animation Rendering (computer graphics) Real time systems Application software Avatars computer graphics Geometry Layout Hardware Information science

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Topology-preserving simplification of 2D nonmanifold meshes with embedded structures

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VISUAL computer 2005年第8-10期21卷 679-688页

作者： Vivodtzev, F Bonneau, GP Le Texier, P INRIA Rhone Alpes INP Genoble CNRS UJFLab GRAVIR F-38334 Saint Ismier France CEA CESTA F-33114 Le Barp France

Mesh simplification has received tremendous attention over the years. Most of the previous work in this area deals with a proper choice of error measures to guide the simplification. Preserving the topological characteristics of the mesh and possibly of data attached to the mesh is a more recent topic and the subject of this paper. We introduce a new topology-preserving simplification algorithm for triangular meshes, possibly nonmanifold, with embedded polylines. In this context, embedded means that the edges of the polylines are also edges of the mesh. The paper introduces a robust test to detect if the collapse of an edge in the mesh modifies either the topology of the mesh or the topology of the embedded polylines. This validity test is derived using combinatorial topology results. More precisely, we define a so-called extended complex from the input mesh and the embedded polylines. We show that if an edge collapse of the mesh preserves the topology of this extended complex, then it also preserves both the topology of the mesh and the embedded polylines. Our validity test can be used for any 2-complex mesh, including nonmanifold triangular meshes, and can be combined with any previously introduced error measure. Implementation of this validity test is described. We demonstrate the power and versatility of our method with scientific data sets from neuroscience, geology, and CAD/CAM models from mechanical engineering.

关键词： computational geometry and its applications LOD techniques multiresolution curves and surfaces

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Non-distorted texture mapping using variational interpolation

Non-distorted texture mapping using variational interpolatio...

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pacific conference on computer graphics and applications

作者： Ying Tang Hujun Bao F.Y. Mong Qunsheng Peng State Key Laboratory of CAD&CG University of Zhejiang China

ISBN: (纸本)0769508685

Presents a new efficient texture mapping algorithm for polygonal meshes. Texture coordinates are assigned to the vertices of the mesh using the variational interpolation technique. For each patch to be mapped, the algorithm first samples equidistantly the boundaries of the patch. In order to decrease distortion, the patch is further sampled as uniformly as possible while its texture domain are correspondingly sampled. The variational interpolation technique is then invoked to yield a parameterization of the patch. The experimental results demonstrate that the algorithm has a great number of potential applications in texture mapping and surface modeling.

关键词： Interpolation Surface texture Scattering parameters Mesh generation computer science Application software Image texture Rendering (computer graphics) Sampling methods Shape

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Augmenting computer graphics with haptics for the visualization of vessel networks

Augmenting computer graphics with haptics for the visualizat...

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pacific conference on computer graphics and applications

作者： Dingrong Yi V. Hayward Department of Electrical and Computer Engineering & Center For Intelligent Machines McGill University Montreal QUE Canada

ISBN: (纸本)0769517846

Current visualization methods of volume angiograms are limited in their ability to display vessel connectivity and depth information readily available in the data set. In this paper, we introduce a hybrid graphic-haptic display technique that allows visualizing vessel connectivity as well as provides user assistance in tracing vessel branches. Most importantly, our display provides three-dimensional shape cues in both visual and haptic domains that eliminate the need for a rotational display for 3D perception. Issues related to haptic rendering, implementation, and experimental validation of the developed system are reported. This proposed multimodal visualization approach is independent of the devices used and can be applied to current visualization platforms for angiograms due to the small computational load it requires.

关键词： computer graphics Haptic interfaces Rendering (computer graphics) Application software Angiography Data visualization Shape computer displays Three dimensional displays Magnetic resonance

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Mesh metamorphosis with topology transformations

Mesh metamorphosis with topology transformations

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pacific conference on computer graphics and applications

作者： Minsu Ahn Seungyong Lee Department of Computer Science and Engineering Pohang University of Science and Technology Pohang South Korea

ISBN: (纸本)0769517846

3D mesh morphing based on a metamesh has fundamental limitations of complicated in-between meshes and no topology (connectivity) changes in a metamorphosis. This paper presents a novel approach for 3D mesh morphing, which is not based on a metamesh. The approach simultaneously interpolates the topology and geometry of input meshes. In our approach, an in-between mesh contains only the vertices from the source and target meshes. Since no additional vertices are introduced, the in-between meshes are much simpler than those generated by previous techniques.

关键词： Topology Geometry Interpolation computer science Mesh generation Animation computer graphics Application software

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Real-time Animation of Sand-Water Interaction

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computer graphics FORUM 2008年第7期27卷 1887-1893页

作者： Rungjiratananon, Witawat Szego, Zoltan Kanamori, Yoshihiro Nishita, Tomoyuki Univ Tokyo Tokyo 1138654 Japan

Recent advances in physically-based simulations have made it possible to generate realistic animations. However, in the case of solid-fluid coupling, wetting effects have rarely been noticed despite their visual importance especially in interactions between fluids and granular materials. This paper presents a simple particle-based method to model the physical mechanism of wetness propagating through granular materials;Fluid particles are absorbed in the spaces between the granular particles and these wetted granular particles then stick together due to liquid bridges that are caused by surface tension and which will subsequently disappear when over-wetting occurs. Our method can handle these phenomena by introducing a wetness value for each granular particle and by integrating those aspects of behavior that are dependent on wetness into the simulation framework. Using this method, a GPU-based simulator can achieve highly dynamic animations that include wetting effects in real time.

关键词： I.3.7 [computer graphics]: Three-Dimensional graphics and Realism

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A 3D Voronoi-based skeleton and associated surface features

A 3D Voronoi-based skeleton and associated surface features

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pacific conference on computer graphics and applications

作者： M. Hisada A.G. Belyaev T.L. Kunii University of Aizu Aizu-Wakamatsu City Japan Hosei University Tokyo Japan IT Institute Kanazawa Institute of Technology Tokyo Japan

The paper proposes an approach for stable extraction of the skeleton of a polygonal surface and detection of surface features, ridges and ravines, corresponding to skeletal edges. The approach adapts the three-dimensional Voronoi diagram technique for skeleton extraction, explores the singularity theory for ridge and ravine detection, and combines several filtering methods for skeleton denoising and for selecting perceptually salient ridges and ravines. Rather than extract the skeleton as a CW-complex, we approximate it with a two-sided surface. It allows us to use standard mesh editing tools for skeleton denoising and achieve stable extraction of the ridges and ravines.

关键词： Skeleton Shape Noise reduction Cities and towns Face detection Filtering theory Paper technology Image edge detection computer vision Head

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Adaptive hierarchical b-spline surface approximation of large-scale scattered data

Adaptive hierarchical b-spline surface approximation of larg...

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pacific conference on computer graphics and applications

作者： Weiqiang Zhang Zesheng Tang Jie Li Department of Computer Science and Technology Tsinghua University Beijing China

ISBN: (纸本)0818686200

A fast algorithm for large scale scattered data approximation is described. The algorithm exploits a coarse-to-fine hierarchical control lattice to fit the scattered data. In this algorithm, the refinement process is only located in the regions where the error between the scattered data and the resulting surface is greater than a specified tolerance. A recursive algorithm is used to find these regions. In order to ensure the C/sup 2/-continuity of the resulting surfaces, we introduce an additional method to get the boundary control points around the subcontrol lattice. Experimental results are included to show that this method can approximate large scale scattered data sets quickly.

关键词： Spline Large-scale systems Scattering Approximation algorithms Lattices Surface fitting

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