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ieee symposium on parallel and Large-Data visualization and graphics (PVG)

作者： I. Wald C. Benthin P. Slusallek Computer Graphics Group Saarland University USA

Recently developed interactive ray tracing systems combine the high performance of todays CPUs with new algorithms and implementations to achieve a flexible and high-performance rendering system offering high-quality, but nonetheless interactive 3D graphics. However, due to its history in offline rendering, interactive ray tracing is usually limited to static scenes and simple walkthroughs. In order to become truly interactive ray tracing must efficiently support dynamic scenes. We present a simple and practical method that allows to interactively ray trace dynamic scenes in a distributed PC cluster environment. Our method separates the scene into independent objects with common properties concerning dynamic updates - similar to OpenGL display lists and scene graph libraries. Three classes of objects are distinguished: static objects are treated as before, objects undergoing affine transformations are handled by transforming rays, and objects with unstructured motion are rebuilt whenever necessary. We present performance and scalability results of our system using a variety of test scenes stressing a wide range of dynamic behaviour.

关键词： Ray tracing Layout Rendering (computer graphics) graphics History Displays Libraries Scalability System testing Dynamic range

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Improving occlusion query efficiency with occupancy maps

Improving occlusion query efficiency with occupancy maps

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ieee symposium on parallel and Large-Data visualization and graphics (PVG)

作者： D. Staneker D. Bartz M. Meissner WSI GRIS University of Tubingen Germany WSI/GRIS University of Tiibingen Germany Eberhard Karls Universitat Tubingen Tubingen Baden-WÃ¼rttemberg DE Tubingen Univ. Germany

Image space occlusion culling is an useful approach to reduce the rendering load of large polygonal models. Like most large model techniques, it trades overhead costs with the rendering costs of the possibly occluded geometry. Meanwhile, modern graphics hardware supports occlusion culling, whereas they associate a significant query overhead, which hurts in particular, if the occlusion culling query itself was unsuccessful. We propose the occupancy map - a compact, cache-optimized representation of coverage information - to reduce the number of costly but unsuccessful occlusion culling queries and to arrange multiple occlusion queries. The information of the occupancy map is used to skip an occlusion query, if the respective map area is not yet set $the respective area has not yet received rendered pixels -, hence an occlusion query would always return not occluded. The remaining occlusion information is efficiently determined by asynchronous multiple occlusion queries with hardware-supported query functionality. To avoid redundant results, we arrange these multiple occlusion queries according to the information of several occupancy maps. Our presented technique is conservative and benefits from a partial depth order of the geometry.

关键词： graphics Geometry Hardware Rendering (computer graphics) Costs Solid modeling Packaging Sampling methods Layout Chromium

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Study and implementation on parallel processing algorithm for DEPS

Study and implementation on parallel processing algorithm fo...

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ieee International symposium on Geoscience and Remote Sensing (IGARSS)

作者： Lingfeng Zhu Yun Shao Xiangtao Fan Huadong Guo Laboratory of Digital Earth Sciences Institute of Remote Sensing Applications Chinese Academy and Sciences Beijing China

ISBN: (纸本)0780379292

A study on efficient visualization and real-time interactivity of large-scale scenes is discussed. Introducing parallel processing technology, we present a parallelizable strategy with the pipeline algorithm, realize this parallel algorithm based on shared-memory, and then apply this program to a test site, the Peking Olympic Games planning mixed scenes, including real-time rendering, dynamical texture loading, quick browsing and so on. The results show a running performance and real-time interactivity improvement of DEPS (Digital Earth Prototype System) when using this algorithm. The parallel program of this paper was developed and running on a Silicon graphics multiprocessor, Onyx 3200, with four MIPS R12000 processors and InfiniteReality 3 graphic accelerator, under IRIX 6.5 operating system.

关键词： parallel processing Layout graphics visualization Large-scale systems Pipelines parallel algorithms Testing Process planning Strategic planning

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Proceedings - ieee 2001 symposium on parallel and Large-Data visualization and graphics

Proceedings - IEEE 2001 Symposium on Parallel and Large-Data...

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ieee symposium on parallel and Large-Data visualization and graphics

ISBN: (纸本)0780372239

The proceedings contain 17 papers. The topics discussed include: visualization challenges for a new cyberpharmaceutical computing paradigm;Delaunay based shape reconstruction from large data;parallel point reprojection;visualizing ocean currents with color and dithering;parallel lagrangian visualization applied to natural convective flows;real-time out-of-core visualization of particle traces;a unified infrastructure for parallel out-of-core isosurface and volume rendering of unstructured grids;parallel view-dependent isosurface extraction using multi-pass occlusion culling;parallel rendering with k-way replication;sort-last parallel rendering for viewing extremely large data sets on tile displays;multiresolution view-dependent splat based volume rendering of large irregular data;parallelizing a high accuracy hardware-assisted volume renderer for meshes with arbitrary polyhedra;and scalable interactive volume rendering using off-the-shelf components.

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Proceedings ieee 2001 symposium on parallel and Large-Data visualization and graphics (Cat. No.01EX520)

Proceedings IEEE 2001 Symposium on Parallel and Large-Data V...

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ieee symposium on parallel and Large-Data visualization and graphics (PVG)

Presents the front cover of the proceedings record.

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Fast processing of medical images using a new parallel architecture, the hybrid system 5

Fast processing of medical images using a new parallel archi...

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5th ieee Southwest symposium on Image Analysis and Interpretation

作者： Leo, CS Schroder, H Nanyang Technol Univ Ctr High Performance Embedded Syst Singapore 2263 Singapore

ISBN: (纸本)0769515371

This paper describes an implementation of Volume Rendering on a new parallel architectural system, the Hybrid System. The Hybrid System is a combination of SIMD system with an MIMD system. For such an architecture, we have developed a new Volume Rendering algorithm called Slice Orientation. Using this new parallel architecture on the visualization algorithm, we have achieved speed-up rates more than its corresponding MIMD can achieve alone. In this paper, we also present a general formula for determining the Speedup of the Hybrid System so that accurate predictions can be made on the performance of the Hybrid System.

关键词： Biomedical image processing Biomedical imaging Casting Concurrent computing Data visualization Electronic mail Embedded system Magnetic resonance imaging parallel architectures Rendering (computer graphics)

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Graph visualization of web data with domain-specific attributes 16

Graph visualization of web data with domain-specific attribu...

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16th International parallel and Distributed Processing symposium, IPDPS 2002

作者： Huang, Mao Lin Faculty of Information Technology University of Technology Sydney SydneyNSW2007 Australia

ISBN: (纸本)0769515738

This paper introduces a new Graph visualization technique that can be used to visualize web objects with many associated attributes. We modify the traditional linear model of graphics-driven visualization by defining two mappings between the abstract data and physical pictures, the Geometric Mapping and the Graphical Mapping. We then use this technique to visualize a variety of domain-specific attributes associated with the web objects in a web graph, such as the access frequency and the connectivity of the web page in the web locality. © 2002 ieee.

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A hardware-assisted scalable solution for interactive volume rendering of time-varying data

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ieee TRANSACTIONS ON visualization AND COMPUTER graphics 2002年第3期8卷 286-301页

作者： Lum, EB Ma, KL Clyne, J Univ Calif Davis CIPIC Davis CA 95616 USA Univ Calif Davis Dept Comp Sci Davis CA 95616 USA Natl Ctr Atmospher Res Boulder CO 80303 USA

We present a scalable volume rendering technique that exploits lossy compression and low-cost commodity hardware to permit highly interactive exploration of time-varying scalar volume data. A palette-based decoding technique and an adaptive bit allocation scheme are developed to fully utilize the texturing capability of a commodity 3D graphics card. Using a single PC equipped with a modest amount of memory, a texture capable graphics card, and an inexpensive disk array, we are able to render hundreds of time steps of regularly gridded volume data (up to 42 million voxels each time step) at interactive rates. By clustering multiple PCs together, we demonstrate the data-size scalability of our method. The frame rates achieved make possible the interactive exploration of data in the temporal, spatial, and transfer function domains. A comprehensive evaluation of our method based on experimental studies using data sets (up to 134 million voxels per time step) from turbulence flow simulations is also presented.

关键词： compression disk I/O high performance computing out-of-core processing parallel rendering PC scalable algorithms scientific visualization texture hardware time-varying data transform encoding volume rendering

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A hardware-assisted scalable solution for interactive volume rendering of time-varying data

A hardware-assisted scalable solution for interactive volume...

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7th ieee symposium on Information visualization (INFOVIS 2001)

作者： Lum, EB Ma, KL Clyne, J Univ Calif Davis CIPIC Davis CA 95616 USA Univ Calif Davis Dept Comp Sci Davis CA 95616 USA Natl Ctr Atmospher Res Boulder CO 80303 USA

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Immersive and interactive exploration of billion atom systems

Immersive and interactive exploration of billion atom system...

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ieee Annual International symposium Virtual Reality

作者： A. Sharma Xinlian Liu P. Miller A. Nakano R.K. Kalia P. Vashishta Wei Zhao T.J. Campbell A. Haas Concurrent Computing Laboratory for Materials Simulations Biological Computation and Visualization Center Department of Computer Science Department of Physics & Astronomy Louisiana State University LA USA Naval Oceanographic Office Major Shared Resource Center Stennis Space Center Logicon Inc. MS USA

ISBN: (纸本)0769514928

Recent advances in parallel computing have made it possible for scientists to perform atomistic simulations of materials involving billions of atoms. An immersive and interactive virtual environment such as ImmersaDesk is an ideal platform for exploring complex material processes in these simulations. However rendering such large datasets at an interactive speed is a major challenge. To solve this problem we have developed a visualization system by incorporating parallel and distributed computing paradigms. The system uses a parallelized fast visibility-culling algorithm based on the octree data structure to reduce the number of atoms sent to the graphics pipeline. An adaptive multiresolution algorithm based on atomic density is employed to further reduce the load on the graphics pipeline. The resulting system renders a billion-atom system at nearly interactive frame rates on a dual processor SGI Onyx2 with an InfiniteReality2 graphics pipeline connected to a 4-node PC cluster.

关键词： graphics Pipelines Computational modeling parallel processing Virtual environment Data visualization Distributed computing Data structures Clustering algorithms Rendering (computer graphics)

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