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Proceedings of the conference on Visualization '00

作者： T. J. Jankun-Kelly Kwan-Liu Ma Computer Science Department Visualization and Graphics Research Group. Center for Image Processing and Integrated Computing University of California Davis CA

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Visualizing DIII-D Tokamak magnetic field lines

Visualizing DIII-D Tokamak magnetic field lines

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IEEE Conference on Visualization

作者： G. Schussman Kwan-Liu Ma D. Schissel T. Evans Center for Image Processing and Integrated Computing Department of Computer Science University of California Davis CA USA General Atomics Court San Diego CA USA

We demonstrate the use of a combination of perceptually effective techniques for visualizing magnetic field data from the DIII-D Tokamak. These techniques can be implemented to run very efficiently on machines with hardware support for OpenGL. Interactive speeds facilitate clear communication of magnetic field structure, enhancing fusion scientists' understanding of their data, and thereby accelerating their research.

关键词： Tokamaks Magnetic fields Plasma confinement Data visualization Plasma sources Magnetic confinement Physics Data analysis Toroidal magnetic fields Hardware

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Boundary determination for trivariate solids

Boundary determination for trivariate solids

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Pacific Conference on computer Graphics and Applications

作者： K.I. Joy M.A. Duchaineau Center for Image Processing and Integrated Computing (CIPIC) Computer Science Department University of California Davis USA Center for Applied Scientific Computing Lawrence Livemore National Laboratory USA

The trivariate tensor-product B-spline solid is a direct extension of the B-spline patch and has been shown to be useful in the creation and visualization of free-form geometric solids. Visualizing these solid objects requires the determination of the boundary surface of the solid, which is a combination of parametric and implicit surfaces. This paper presents a method that determines the implicit boundary surface by examination of the Jacobian determinant of the defining B-spline function. Using an approximation to this determinant, the domain space is adaptively subdivided until a mesh can be determined such that the boundary surface is close to linear in the cells of the mesh. A variation of the marching cubes algorithm is then used to draw the surface. Interval approximation techniques are used to approximate the Jacobian determinant and to approximate the Jacobian determinant gradient for use in the adaptive subdivision methods. This technique can be used to create free-form solid objects, useful in geometric modeling applications.

关键词： Spline Jacobian matrices Solid modeling Visualization Rendering (computer graphics) Surface cracks image processing computer science Scientific computing Laboratories

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Optimal linear spline approximation of digitized models

Optimal linear spline approximation of digitized models

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IEEE International Conference on Information Visualization, IV 1999

作者： Hamann, Bemd Kreylos, Oliver Monno, Giuseppe Uva, Antonio E. Center for Image Processing and Integrated Computing Department of Computer Science University of California DavisCA United States Dipartimento di Progettazione e Produzione Industriale Politecnico di Bari Bari Italy

ISBN: (纸本)0769502105

In this paper we present a new technique for surface reconstruction of digitized models in three dimensions. Concerning this problem, we are given a data set in threedimensional space, represented as a set of points without connectivity information, and the goal is to find, for a Jxed number of vertices, a set of approximating triangles which minimize the error measured by the displacement from the given points. Our method creates near-optimal linear spline approximations, using an iterative optimization scheme based on simulated annealing. The algorithm adapts the mesh to the data set and moves the triangles to enhance feature lines. .4 t the end, we can use the approach to create a hierarchy of dtfferent resolutions for the model. © 1999 IEEE.

关键词： Simulated annealing

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Construction of vector field hierarchies 99

Construction of vector field hierarchies

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Proceedings of the conference on Visualization '99: celebrating ten years

作者： Bjoern Heckel Gunther Weber Bernd Hamann Kenneth I. Joy Center for Image Processing and Integrated Computing (CIPIC) Computer Science Department University of California Davis AG Graphische Datenverarbeitung and Computergeometrie Fachbereich Informatik Universität Kaiserslautern Germany

ISBN: (纸本)9780780358973

We present a method for the hierarchical representation of vector fields. Our approach is based on iterative refinement using clustering and principal component analysis. The input to our algorithm is a discrete set of points with associated vectors. The algorithm generates a top-down segmentation of the discrete field by splitting clusters of points. We measure the error of the various approximation levels by measuring the discrepancy between streamlines generated by the original discrete field and its approximations based on much smaller discrete data sets. Our method assumes no particular structure of the field, nor does it require any topological connectivity information. It is possible to generate multiresolution representations of vector fields using this approach.

关键词： binary-space partitioning data simplification Hardy's multiquadric method vector field visualization

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Construction of vector field hierarchies

Construction of vector field hierarchies

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IEEE Conference on Visualization

作者： B. Heckel G. Weber B. Hamann K.I. Joy Center for Image Processing and Integrated Computing (CIPIC) Computer Science Department University of California Davis USA AG Graphische Datenverarbeitung and Computergeometrie Fachbereich Informatik Universität Kaiserslautern Germany

Presents a method for the hierarchical representation of vector fields. Our approach is based on iterative refinement using clustering and principal component analysis. The input to our algorithm is a discrete set of points with associated vectors. The algorithm generates a top-down segmentation of the discrete field by splitting clusters of points. We measure the error of the various approximation levels by measuring the discrepancy between streamlines generated by the original discrete field and its approximations based on much smaller discrete data sets. Our method assumes no particular structure of the field, nor does it require any topological connectivity information. It is possible to generate multi-resolution representations of vector fields using this approach.

关键词： Data visualization Clustering algorithms image processing computer science Iterative algorithms Iterative methods Principal component analysis Computational modeling computer simulation

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Optimal linear spline approximation of digitized models

Optimal linear spline approximation of digitized models

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International Conference on Information Visualisation (IV)

作者： B. Hamann O. Kreylos G. Monno A.E. Uva Center for Image Processing and Integrated Computing (CIPIC) Department of Computer Science University of California Davis USA Dipartimento di Progettazione e Produzione Industriale Politecnico di Bari Bari Italy

We present a new technique for surface reconstruction of digitized models in three dimensions. Concerning this problem, we are given a data set in three-dimensional space, represented as a set of points without connectivity information, and the goal is to find, for a fixed number of vertices, a set of approximating triangles which minimize the error measured by the displacement from the given points. Our method creates near-optimal linear spline approximations, using an iterative optimization scheme based on simulated annealing. The algorithm adopts the mesh to the data set and moves the triangles to enhance feature lines. At the end, we can use the approach to create a hierarchy of different resolutions for the model.

关键词： Spline Linear approximation Surface reconstruction image reconstruction Shape Sampling methods Clouds Solid modeling Isosurfaces Reconstruction algorithms

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Towards interactive finite element analysis of shell structures in virtual reality

Towards interactive finite element analysis of shell structu...

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International Conference on Information Visualisation (IV)

作者： A. Liverani F. Kuester B. Hamann DIEM University of Bologna Italy Center for Image Processing and Integrated Computing Department of Computer Science University of California Davis CA USA

A first step towards a semi-immersive virtual reality (VR) interface for finite element analysis (FEA) is presented in this paper. During recent years, user interfaces of FEA solvers have matured from character-based command-line driven implementations into easy-to-use graphical user interfaces (GUIs). This new generation of GUIs provides access to intuitive and productive tools for the management and analysis of structural problems. Many pre- and post-processors have been implemented targeting the simplification of the man-machine interface in order to increase the ease of use and provide better visual analysis of FEA solver results. Nevertheless, none of these packages provides a real 3D-enabled interface. The main objective of this project is to join state-of-the-art visualization technology, VR devices, and FEA solvers into the integrated development environment VRFEA.

关键词： Finite element methods Structural shells Virtual reality Analytical models Data visualization Design engineering Hardware image analysis computer interfaces Humans

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3DIVS: 3-Dimensional immersive virtual sculpting

3DIVS: 3-Dimensional immersive virtual sculpting

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1999 Workshop on New Paradigms in Information Visualization and Manipulation, NPIVM 1999

作者： Kuester, Falko Joy, Kenneth I. Duchaineau, Mark A. Hamann, Bernd Uva, Antonio E. Center for Image Processing and Integrated Computing Department of Computer Science University of California DavisCA United States Lawrence Livermore National Laboratory 7000 East Ave. LivermoreCA94550 United States Dipartimento di Progettazione e Produzione Industriale Politecnico di Bari Viale Japigia 182 Bari70126 Italy

ISBN: (纸本)1581132549

Virtual Environments (VEs) have the potential to revolutionize traditional product design by enabling the transition from conventional CAD to fully digital product development. The presented prototype system targets closing the "digital gap" as introduced by the need for physical models such as clay models or mockups in the traditional product design and evaluation cycle. We describe a design environment that provides an intuitive human-machine interface for the creation and manipulation of three-dimensional (3D) models in a semi-immersive design space, focussing on ease of use and increased productivity for both designer and CAD engineers. © Copyright 2000 ACM.

关键词： Virtual reality

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High-quality rendering of smooth isosurfaces

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computer Animation and Virtual Worlds 1999年第2期10卷

作者： Eric LaMar Bernd Hamann Kenneth I. Joy Center for Image Processing and Integrated Computing (CIPIC) Department of Computer Science University of California Davis CA 95616 8562 U.S.A.

Animation and visualization of rectilinear data require interpolation schemes for smooth image generation. Piecewise trilinear interpolation, the de facto standard for interpolating rectilinear data, usually leads to significant visual artifacts in the resulting imagery. These artifacts reduce the confidence in the resulting visualization and may even lead to false interpretations of the data. This paper is concerned with the generation of smooth isosurface image sequences, obtained by casting rays through the image plane and computing their intersections with an isosurface. We describe a novel solution to this problem: we replace trilinear interpolation by tricubic interpolation, smoothing out the artifacts in the images; and we simplify the ray–isosurface intersection calculations by rotating and resampling the original rectilinear data in a second rectilinear grid—a grid with one family of grid planes parallel to the image plane. Our solution significantly reduces artifacts in individual images and leads to smooth animations. Copyright © 1999 John Wiley & Sons, Ltd.

关键词： animation approximation trilinear splines volume visualization ray casting isosurfaces resampling Catmull–Rom splines Hardy's multiquadric scheme

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