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检索条件"机构=Visualization and Computer Graphics"

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Out-of-core interactive display of large meshes using an oriented bounding box-based hardware depth query

Out-of-core interactive display of large meshes using an ori...

引用

Proceedings of the Seventh IASTED International Conference on computer graphics and Imaging

作者： Ha, Haeyoung Gregorski, Benjamin F. Joy, Kenneth I. Visualization/Comp. Graphics Grp. Department of Computer Science University of California Davis Davis CA United States

In this paper we present an occlusion culling method that uses hardware-based depth queries on oriented bounding boxes to cull unseen geometric primitives efficiently. An out-of-core design enables this method to interactively display data sets that are too large to fit into main memory. During a preprocessing phase, a spatial subdivision (such as an octree or BSP tree) of a given data set is constructed where, for each node, an oriented bounding box containing mesh primitives is computed using principal component analysis (PCA). At runtime, the tree indicated by the spatial subdivision is traversed in front-to-back order, and only nodes that are determined to be visible, based on a hardware accelerated depth query, are rendered.

关键词： Interactive computer graphics

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A hybrid LOD based rendering approach for dynamic scenes

A hybrid LOD based rendering approach for dynamic scenes

引用

computer graphics International

作者： K. Hilbert G. Brunnett Computer Graphics and Visualization Chemnitz University of Technology Germany

In this paper we present a novel LOD based rendering approach that integrates geometry based and image based LOD mechanisms in one system. We assume that every LOD object in the scene is represented by a textured polygonal mesh. In a preprocess we generate a continuous multiresolution model for all LOD objects. During runtime we first check for every LOD object if an appropriate cached approximation generated for former frames is available. If not, we extract a new suitable approximation out of the objects continuous multiresolution model depending on view-dependent criteria. After that, we replace this adaptive geometry-based approximation by an image-based impostor if this is reasonable and efficient. The selected approximations of LOD objects are used for rendering the next frame

关键词： Layout Rendering (computer graphics) computer graphics visualization Chemical technology Computational geometry Virtual reality Runtime Sprites (computer) Image generation

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Multi-path algorithm for triangle strips

Multi-path algorithm for triangle strips

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computer graphics International

作者： P. Vanecek I. Kolingerova Centre of Computer Graphics and Data Visualization Department of Computer Science and Engineering University of West Bohemia Pilsen Czech Republic

Triangle surface models belong to the most popular type of geometric objects description in computer graphics. Therefore, the problem of fast visualization of this type of data is often solved. One of popular approaches is stripification, i.e., a conversion of triangle surface into strips of triangles. This enables to reduce the rendering time by reduction data size and by avoiding of redundant lighting and transformations computations. In this paper we present a new stripification algorithm for static fully triangulated meshes. Our new algorithm is based on the dual graph of triangulation. The experimental results show that our stripification produces much lower number of triangle strips than other stripification algorithms (except one)

关键词： Strips computer graphics Data visualization Rendering (computer graphics) Costs computer science Data engineering Solid modeling Application software computer aided manufacturing

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GPU-PIV

GPU-PIV

引用

Vision, Modeling and visualization 2004, VMV 2004

作者： Schiwietz, Thomas Westermann, Rüdiger Siemens Corporate Research Inc. 755 College Road East PrincetonNJ08540 United States Technische Universität München Institut für Informatik Computer Graphics and Visualization Group Boltzmannstr. 3 Garching85748 Germany

ISBN: (纸本)3898380580

Digital Particle Image Velocimetry (PIV) is an optical technique used to measure the velocity of seeded particles in real flow. A CCD camera captures the flow field twice under exposure to a short duration laser flash. Recorded image pairs are cross-correlated to extract velocity information from these records. Time resolved PIV technology can capture images with some hundreds of frames per second. In this paper, we present a PIV-system that implements vector field reconstruction and visualization on programmable graphics processing units (GPUs) thus providing a high-speed back-end for time resolved PIV technology. We propose an efficient FFT implementation on such hardware, which is used to cross-correlate multiple pairs of interrogation windows. To visualize extracted vector fields we employ functionality to create and to render geometry data on the GPU. In this way, not only can any data transfer between the CPU and the GPU be avoided, but spatial information derived from PIV as well as the time history of points in the flow can be combined instantaneously.

关键词： graphics processing unit

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Multiple-contact representation for the real-time volume haptic rendering of a non-rigid object

Multiple-contact representation for the real-time volume hap...

引用

International Symposium on Haptic Interfaces for Virtual Environment and Teleoperator Systems (HAPTICS)

作者： Sang-Youn Kim Jinah Park Dong-Soo Kwon Telerobotics & Control Laboratory Department of Mechanical Engineering Korea Advanced Institute of Science and Technology South Korea Computer Graphics & Visualization Laboratory School of Engineering ICU South Korea

ISBN: (纸本)0769521126

This paper presents a fast haptic rendering method providing the sense of touch from a virtual volumetric non-rigid object when a human operator interacts with the object at multiple points. Previously, we have proposed a fast volume haptic rendering method based on the shape-retaining chain linked model (or the S-chain model) that can handle the deformation of a volumetric non-rigid object and its haptic feedback in real time. One of the key differences between the S-chain model and a traditional FEM or mass-spring model is that the computation of the deformation and its reflected force is performed at a local level. When there are more than one interaction points with the object, it is necessary to consider a modeling framework that can handle human operator's all inputs together. In this paper, we propose a modeling framework in which forces generated at interaction points are vectorially summed to deal with the multiple contact points. Our experiments demonstrate that our proposed method is suitable for the real-time volume haptic rendering of a volumetric non-rigid object with multiple-contact points.

关键词： Haptic interfaces Humans Rendering (computer graphics) Computational modeling Deformable models Minimally invasive surgery Laboratories Feedback Telerobotics Mechanical engineering

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A context-oriented RDF Database 1

A context-oriented RDF Database

引用

1st International Conference on Semantic Web and Databases, SWDB 2003

作者： Tazari, Mohammad-Reza Computer Graphics Center Dept. Mobile Information Visualization Fraunhoferstraße 5 Darmstadt64283 Germany

The importance of contextual knowledge in knowledge management and organizational memory is shown in topical literature. Even in an initial visionary scenario for the Semantic Web, one can immediately encounter the contextual knowledge needed to realize the necessary services. Hence, it is not inappropriate to claim that context management is an integral service of the Semantic Web. After discussing the distributed nature of contextual knowledge, we define some requirements for a context-oriented database service and then introduce CORD as a service satisfying those requirements based on the Semantic Web technologies. Selected features of CORD that provide some contribution to the discussions within the Semantic Web research community, like embedded resources, query language, and definition of rules, are discussed in some detail.

关键词： Query languages

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MoireGraphs: Radial focus+context visualization and interaction for graphs with visual nodes

MoireGraphs: Radial focus+context visualization and interact...

引用

9th Annual IEEE Symposium on Information visualization, InfoVis 2003

作者： Jankun-Kelly, T.J. Ma, Kwan-Liu Department of Computer Science and Engineering Mississippi State University MS 39762 United States Visualization and Graphics Research Group Department of Computer Science University of California Davis CA 95616 United States

ISBN: (纸本)0780381548

Graph and tree visualization techniques enable interactive exploration of complex relations while communicating topology. However, most existing techniques have not been designed for situations where visual information such as images is also present at each node and must be displayed. This paper presents MoireGraphs to address this need. MoireGraphs combine a new focus+context radial graph layout with a suite of interaction techniques (focus strength changing, radial rotation, level highlighting, secondary foci, animated transitions and node information) to assist in the exploration of graphs with visual nodes. The method is scalable to hundreds of displayed visual nodes. © 2003 IEEE.

关键词： visualization

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Compression domain volume rendering

Compression domain volume rendering

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IEEE Conference on visualization

作者： J. Schneider R. Westermann Computer Graphics and Visualization Group Technical University Munich Germany

A survey of graphics developers on the issue of texture mapping hardware for volume rendering would most likely find that the vast majority of them view limited texture memory as one of the most serious drawbacks of an otherwise fine technology. In this paper, we propose a compression scheme for static and time-varying volumetric data sets based on vector quantization that allows us to circumvent this limitation. We describe a hierarchical quantization scheme that is based on a multiresolution covariance analysis of the original field. This allows for the efficient encoding of large-scale data sets, yet providing a mechanism to exploit temporal coherence in non-stationary fields. We show, that decoding and rendering the compressed data stream can be done on the graphics chip using programmable hardware. In this way, data transfer between the CPU and the graphics processing unit (GPU) can be minimized thus enabling flexible and memory efficient real-time rendering options. We demonstrate the effectiveness of our approach by demonstrating interactive renditions of Gigabyte data sets at reasonable fidelity on commodity graphics hardware.

关键词： Rendering (computer graphics) computer graphics Hardware Vector quantization Data visualization Large-scale systems Decoding Central Processing Unit Shock waves Encoding

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Acceleration techniques for GPU-based volume rendering

Acceleration techniques for GPU-based volume rendering

引用

IEEE Conference on visualization

作者： J. Kruger R. Westermann Computer Graphics and Visualization Group Technical University Munich Germany

Nowadays, direct volume rendering via 3D textures has positioned itself as an efficient tool for the display and visual analysis of volumetric scalar fields. It is commonly accepted, that for reasonably sized data sets appropriate quality at interactive rates can be achieved by means of this technique. However, despite these benefits one important issue has received little attention throughout the ongoing discussion of texture based volume rendering: the integration of acceleration techniques to reduce per-fragment operations. In this paper, we address the integration of early ray termination and empty-space skipping into texture based volume rendering on graphical processing units (GPU). Therefore, we describe volume ray-casting on programmable graphics hardware as an alternative to object-order approaches. We exploit the early z-test to terminate fragment processing once sufficient opacity has been accumulated, and to skip empty space along the rays of sight. We demonstrate performance gains up to a factor of 3 for typical renditions of volumetric data sets on the ATI 9700 graphics card.

关键词： Acceleration Rendering (computer graphics) Hardware computer graphics Sampling methods Data visualization Three dimensional displays computer displays Performance gain Chromium

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Smart 3D visualizations in clinical applications

引用

3rd International Symposium on Smart graphics, SG 2003

作者： Preim, Bernhard Peitgen, Heinz-Otto Institute for Simulation and Graphics Department for Computer Science Otto-von-Guericke-University of Magdeburg Universitaetsplatz 2 Magdeburg39106 Germany Center for Medical Diagnosic Systems and Visualization Universitaetsallee 29 Bremen28359 Germany

ISBN: (纸本)3540405577

We discuss techniques for the visualization of medical volume data dedicated for their clinical use. We describe the need for rapid dynamic interaction facilities with such visualizations and discuss emphasis techniques in more detail. Another crucial aspect of medical visualization is the integration of 2d and 3d visualizations. In order to organize this discussion, we introduce 6 „Golden"rules for medical visualizations. © Springer-Verlag Berlin Heidelberg 2003.

关键词： visualization

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