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Discrete differential error metric for surface simplification 10

Discrete differential error metric for surface simplificatio...

引用

10th pacific conference on computer graphics and applications, PG 2002

作者： Kim, Sun-Jeong Kim, Soo-Kyun Kim, Chang-Hun Department of Computer Science and Engineering Korea University 1 5-ka Anam-dong Sungbuk-ku Seoul136-701 Korea Republic of

ISBN: (纸本)0769517846

In this paper we propose a new discrete differential error metric for surface simplification. Many surface simplification algorithms have been developed in order to produce rapidly high quality approximations of polygonal models, and the quadric error metric based on the distance error is the most popular and successful error metric so far Even though such distance based error metrics give visually pleasing results with a reasonably fast speed, it is hard to measure an accurate geometric error on a highly curved and thin region since the error measured by the distance metric on such a region is usually small and causes a loss of visually important features. To overcome such a drawback, we define a new error metric based on the theory of local differential geometry in such a way that the first and the second order discrete differentials approximated locally on a discrete polygonal surface are integrated into the usual distance error metric. The benefits of our error metric are preservation of sharp feature regions after a drastic simplification, small geometric errors, and fast computation comparable to the existing methods. © 2002 IEEE.

关键词： Geometry

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Roadmap-based flocking for complex environments 10

Roadmap-based flocking for complex environments

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10th pacific conference on computer graphics and applications, PG 2002

作者： Bayazit, O. Burchan Lien, Jyh-Ming Amato, Nancy M. Texas A and M University PARASOL Lab Dept. of Computer Science College StationTX77843-3112 United States

ISBN: (纸本)0769517846

Flocking behavior is very common in nature, and there have been ongoing research efforts to simulate such behavior in computer animations and robotics applications. Generally, such work considers behaviors that can be determined independently by each flock member solely by observing its local environment, e.g., the speed and direction of its neighboring flock members. Since flock members are not assumed to have global information about the environment, only very simple navigation and planning techniques have been considered for such flocks. In this paper, we investigate how the addition of global information in the form of a roadmap of the environment enables more sophisticated flocking behaviors. In particular, we study and propose new techniques for three distinct group behaviors: homing, exploring and shepherding. These behaviors exploit global knowledge of the environment and utilize knowledge gathered by all flock members. This knowledge is communicated by allowing individual flock members to dynamically update the shared roadmap to reflect (un)desirable routes or regions. We present experimental results showing how the judicious use of simple roadmaps of the environment enables more complex behaviors to be obtained at minimal cost. © 2002 IEEE.

关键词： Motion planning

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Array of multiple-focus holographic phase microelements

Array of multiple-focus holographic phase microelements

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conference on Photorefractive Fiber and Crystal Devices - Materials, Optical Properties and applications VIII

作者： Mikaelian, AL Prokopenko, SA Palagushkin, AN Russian Acad Sci Inst Opt Neural Technol Moscow 117333 Russia

ISBN: (纸本)0819445711

The paper considers research and development of arrays of computer-generated multiple-focus phase microholograms for providing given light patterns in the near field zone. Peculiarities of such arrays are discussed. The main result of the talk is the fabrication of the microhologram array providing the given complex image in the focal plane. The size of array was 1.54 mm × 1.54 mm.

关键词： computer generated holography Raster graphics Holograms Holography Computing systems Diffraction Near field optics Manufacturing Near field Staring arrays

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Enhancing 3D graphics on mobile devices by image-based rendering 3rd

Enhancing 3D graphics on mobile devices by image-based rende...

引用

3rd IEEE pacific Rim conference on Multimedia, PCM 2002

作者： Chang, Chun-Fa Ger, Shyh-Haur Department of Computer Science National Tsing Hua University Hsinchu Taiwan

ISBN: (纸本)3540002626

Compared to a personal computer, mobile devices typically have weaker processing power, less memory capacity, and lower resolution of display. While the former two factors are clearly disadvantages for 3D graphics applications running on mobile devices, the display factor could be turned into an advantage instead. However the traditional 3D graphics pipeline cannot take advantage of the smaller display because its run time depends mostly on the number of polygons to be rendered. In contrast, the run time of image-based rendering methods depends mainly on the display resolution. Therefore it is well suited for mobile devices. Furthermore, we may use the network connection to build a client-server framework, which allows us to integrate with non-image-based rendering programs. We present our system framework and the experiment results on PocketPC® based devices in this work. © Springer-Verlag Berlin Heidelberg 2002.

关键词： Personal computers

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Lworld: an animation system based on rewriting

Lworld: an animation system based on rewriting

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pacific conference on computer graphics and applications

作者： H. Noser Institute of Computer Technology Multimedia Laboratory University of Zurich Zurich Switzerland

Lworld is a computer graphics animation system based on L-systems, a parallel rewriting technique used primarily in computer graphics for plant modeling. Because rule-based programming is a powerful technique, we use it as a basis for a general-purpose animation system. We describe the architecture, the features, and the programming language of the animation system. It is particularly well suited to model fractal curves, plants, fractal landscapes, group animation, visualization, and evolutionary optimizations. Lworld allows users to create real-time animations as well as raytraced image sequences for further movie production. It is freely available, and runs on PCs.

关键词： Animation computer graphics Power system modeling Fractals computer architecture computer languages Visualization Image sequences Motion pictures Production

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Interactive simulation of fire

Interactive simulation of fire

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pacific conference on computer graphics and applications

作者： Z. Melek J. Keyser Computer Science Department Texas A and M University USA

In this paper we describe a fast and interactive model to simulate and control the fire phenomenon. We use a modified interactive fluid dynamics solver to describe the motion of a 3-gas system. We simulate the motion of oxidizing air, fuel gases, and exhaust gases. The burning process is simulated by consuming fuel and air based on the amounts of fuel and air inside each grid cell. By modeling heat distribution, we also simulate the spread of fire to and self-ignition in other combustible solids.

关键词： Fires Fuels Combustion Computational modeling Gases Solid modeling computer science computer simulation Fluid dynamics computer graphics

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A simple layered RGB BRDF model

A simple layered RGB BRDF model

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pacific conference on computer graphics and applications

作者： X. Granier W. Heidrich Department of Computer Science IMAGER University of British Columbia Vancouver BC Canada

Many natural objects, and general layered materials, have non-linear reflection behaviour along wavelengths. An accurate representation of phenomena such as interference and colour separation generally requires a fine spectral representation of light instead of the commonly used RGB components. In this article, we introduce and experiment with a general approach to create similar and convincing effects, with a simple RGB BRDF model. We present a model for both specular and diffuse reflection.

关键词： Optical reflection Interference Computational modeling Solid modeling Lighting computer graphics Surface waves computer science Bidirectional control Reflectivity

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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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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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