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Practical Global Illumination for Hair Rendering

Practical Global Illumination for Hair Rendering

引用

pacific conference on computer graphics and applications

作者： Cem Yuksel Ergun Akleman John Keyser Computer Science Texas A and M University USA Visualization Sciences Texas A and M University USA

Both hair rendering and global illumination are known to be computationally expensive, and for this reason we see very few examples using global illumination techniques in hair rendering. In this paper, we elaborate on different simplification approaches to allow practical global illumination solutions for high quality hair rendering. We categorize light paths of a full global illumination solution, and analyze their costs and illumination contributions both theoretically and experimentally. We also propose two different implementation techniques using our novel projection based indirect illumination computation approach and state of the art ray tracing for hair. Our results show that by using our simplifications, a global illumination solution for hair is practical.

关键词： Lighting Hair Light scattering Particle scattering Rendering (computer graphics) computer graphics computer science Ray tracing Computational complexity Light sources

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On-line graphics recognition

On-line graphics recognition

引用

pacific conference on computer graphics and applications

作者： Jin Xiangyu Liu Wenyin Sun Jianyong Zhengxing Sun State Key Laboratory for Novel Software Technology Nanjing University Nanjing China Department of Computer Science City University of Hong Kong China

ISBN: (纸本)0769517846

A novel and fast shape classification and regularization algorithm for on-line sketchy graphics recognition is proposed. We divided the on-line graphics recognition process into four stages: preprocessing, shape classification, shape fitting, and regularization. The attraction force model is proposed to combine progressively the vertices on the input sketchy stroke and reduce the total number of vertices before the type of shape can be determined After that, the shape is fitted and gradually rectified to a regular one, thus the regularized shape fits the user-intended one precisely. Experimental results show that this algorithm can rapidly yield good recognition precision (averagely above 90%) and a fine regularization effect. Consequently, it is especially suitable for weak computation environments such as PDAs, which solely depend on a pen-based user interface.

关键词： Shape computer graphics Filters Personal digital assistants Decision trees Image segmentation Sun computer science Classification algorithms Software algorithms

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Rubber-like Exaggeration for Character Animation

Rubber-like Exaggeration for Character Animation

引用

pacific conference on computer graphics and applications

作者： Ji-yong Kwon In-Kwon Lee Yonsei University Seoul South Korea

Motion capture cannot generate cartoon-style animation directly. We emulate the rubber-like exaggerations common in traditional character animation as a means of converting motion capture data into cartoon-like movement. We achieve this using trajectory-based motion exaggeration while allowing the violation of link-length constraints. We extend this technique to obtain smooth, rubber-like motion by dividing the original links into shorter sub-links and computing the positions of joints using B´ezier curve interpolation and a mass-spring simulation. This method is fast enough to be used in real time.

关键词： Animation computer graphics Character generation Application software Computational modeling Humans Nonlinear equations

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Augmenting computer graphics with haptics for the visualization of vessel networks

Augmenting computer graphics with haptics for the visualizat...

引用

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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Incremental view-dependent multiresolution triangulation of terrain

Incremental view-dependent multiresolution triangulation of ...

引用

pacific conference on computer graphics and applications

作者： R. Klein D. Cohen-Or T. Huttner Wilhelm-Schickard-Institut GRIS Universitat Tubingen Germany School of Mathematical Sciences Tel-Aviv University Israel Wilhelm-Schickard-Institut GRIS Universitat Tübingen Germany

A view-dependent multiresolution triangulation algorithm is presented for a real-time flythrough. The triangulation of the terrain is generated incrementally on-the-fly during the rendering time. We show that since the view changes smoothly only a few incremental modifications are required to update the triangulation to a new view. The resulting triangles form a multiresolution Delaunay triangulation which satisfies a predetermined view-dependent error tolerance. The presented method provides a guaranteed quality mesh since it has control over the global geometric approximation error of the multiresolution view-dependent triangulation.

关键词： computer graphics Rendering (computer graphics) Spatial resolution computer errors Approximation error Workstations Data visualization Hardware Pipelines Tail

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An efficient control over human running animation with extension of planar hopper model

An efficient control over human running animation with exten...

引用

pacific conference on computer graphics and applications

作者： Young-Min Kang Sun-Jin Park Ee-Taek Lee Dept. of Comput. Sci. Pussan Nat. Univ. South Korea

ISBN: (纸本)0818686200

The most important goal of character animation is to efficiently control the motions of a character. Until now, many techniques have been proposed for human gait animation, and some techniques have been created to control the emotions in gaits such as "tired walking" and "brisk walking" by using parameter interpolation or motion data mapping. Since it is very difficult to automate the control over the emotion of a motion, the emotions of a character model have been generated by creative animators. The paper proposes a human running model based on a one-leg-planar hopper with a self-balancing mechanism. The proposed technique exploits genetic programming to find an optimal movement. We extend the energy minimization technique to generate various motions in accordance with emotional specifications, for instance, "brisk running".

关键词： Humans Animation Legged locomotion Computational modeling Motion control computer graphics Application software computer science Information processing Genetic programming

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Subdivision surface simplification

Subdivision surface simplification

引用

pacific conference on computer graphics and applications

作者： Won-Ki Jeong K. Kahler H.-P. Seidel Max Planck Institut für Informatik Saarbruecken Germany

A modified quadric error metric (QEM) for simplification of Loop subdivision surfaces is presented The suggested error metric not only measures the geometric difference but also controls the smoothness and well-shapedness of the triangles that result from the decimation process. Minimizing the error with respect to the original limit surface, our method allows for drastic simplification of Loop control meshes with convenient control over the reproduction of sharp features.

关键词： Surface fitting Error correction Surface reconstruction Tensile stress Bridges Control systems Displays Mesh generation computer graphics Application software

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Procedural Modeling of Water Caustics and Foamy Water for Cartoon Animation

Procedural Modeling of Water Caustics and Foamy Water for Ca...

引用

pacific conference on computer graphics and applications

作者： Jing Liao Jinhui Yu Long Jia State key Laboratory of CAD&CG University of Zhejiang Hangzhou China School of IT & Mathematical Sciences University of Ballarat Ballarat Australia

We propose a method for procedural modeling and animation of cartoon water effects such as water caustics and foamy water. In our method we emulate the visual abstraction of these cartoon effects by the use of Voronoi diagrams and the motion abstraction by designing relevant controlling mechanisms corresponding to each effect. Our system enables the creation of cartoon effects with minimal intervention from the animator. Through high-level initial specification, the effects are animated procedurally in the style of hand-drawn cartoons.

关键词： Animation Rendering (computer graphics) Surface waves Surface texture Visualization

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Visualisation of Implicit Algebraic Curves

Visualisation of Implicit Algebraic Curves

引用

pacific conference on computer graphics and applications

作者： Lionel Alberti Bernard Mourrain GALAAD INRIA Sophia-Antipolis France

We describe a new algorithm for the visualisation of implicit algebraic curves, which isolates the singular points, compute the topological degree around these points in order to check that the topology of the curve can be deduced from the points on the boundary of these singular regions. The other regions are divided into x or y regular regions, in which the branches of the curve are also determined from information on the boundary. Combined with enveloping techniques of the polynomial represented in the Bernstein basis, it is shown on examples that this algorithm is able to render curves defined by high degree polynomials with large coefficients, to identify regions of interest and to zoom safely on these regions.

关键词： Visualization Topology Polynomials Equations Testing Geometry computer graphics Application software Solid modeling Mathematics

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Interactive volume illustration and feature halos

Interactive volume illustration and feature halos

引用

pacific conference on computer graphics and applications

作者： N.A. Svakhine D.S. Ebert Purdue University USA Rendering and Perceptualization Laboratory (PURPL) Purdue University West Lafayette IN USA

Volume illustration is a developing trend in volume visualization, focused on conveying volume information effectively by enhancing interesting features of the volume and omitting insignificant data. However, the calculations involved have limited the illustration process to non-interactive rendering. We have developed a new interactive volume illustration system (IVIS) that harnesses the power of programmable graphics processors, and includes a novel approach for feature halo enhancement. This interactive illustration system is a powerful tool for exploration and analysis of volumetric datasets.

关键词： Rendering (computer graphics) Hardware Isosurfaces Acceleration Shape computer graphics Data visualization Data analysis Biomedical imaging Program processors

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