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检索条件"任意字段=Proceedings of the IEEE 2001 symposium on parallel and large-data visualization and graphics"

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Dynamic view-dependent partitioning of structured grids with complex boundaries for object-order rendering techniques

Dynamic view-dependent partitioning of structured grids with...

引用

1999 ieee symposium on parallel visualization and graphics, PVGS 1999

作者： Burton, Lance C. Machiraju, Raghu Reese, Donna S. NSF Engineering Research Center for Computational Field Simulation Dept. of Computer Science Mississippi State University P.O. Box 9627 Mississippi StateMS39762 United States

ISBN: (纸本)1581132379

Object-order rendering techniques present an attractive approach to run-time visualization of structured grid data, particularly when combined with a parallel rendering paradigm such as image composition. The ability of this combination to exploit hardware exceeds that of parallel image order methods. However, certain configurations of grid boundaries prevent composition from being performed correctly. In particular, when the boundary between two partitions contains concave sections, the partitions may no longer be depth sorted correctly, a requirement for some visualization techniques such as direct volume rendering. This occurs because the concave boundary prevents even the simple ordering of two adjacent partitions. If the data may be repartitioned such that it can be depth sorted correctly, then an image composition approach is a viable option. To facilitate such an operation, we present an algorithm to analyze the geometric structure of a grid boundary and extract knowledge about how the boundary impacts depth sorting and therefore image composition. We then show through examples how this knowledge may be applied to create a set of partitions that may be properly depth sorted.

关键词： visualization

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Reducing data distribution bottlenecks by employing data visualization filters

Reducing data distribution bottlenecks by employing data vis...

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proceedings of the 1999 8th ieee International symposium on High Performance Distributed Computing - HPDC-8

作者： Franke, Ernest Magee, Michael Southwest Research Inst

A methodology intended to avoid bottlenecks that typically arise as the result of data consumers that must access and process large amounts of data that has been generated and resides on other hosts, and which must pass through a central data cache prior to being used by the data consumer is described. It is based on a fundamental paradigm that the end result rendered by a data consumer can be produced using a reduced data set that has been distilled or filtered from the original data set. data distribution bottlenecks for visualization applications are reduced by avoiding the transfer of large amounts of raw data in favor of considerably distilled visual data.

关键词： parallel processing systems

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parallel multipipe rendering for very large isosurface visualization

Parallel multipipe rendering for very large isosurface visua...

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1st Joint Eurographics - ieee TCVG symposium on visualization, VisSym 1999

作者： Udcshi, Tushar Hansen, Charles D. Department of Computer Science University of Utah 50 S. Campus Center Drive Em. 3190 Salt Lake CityUT84112-9205 United States

ISBN: (纸本)9783709168035

In exploratory scientific visualization, isosurfaces are typically created with an explicit polygonal representation for the surface using a technique such as Marching Cubes. For even moderate data sets, Marching Cubes can generate an extraordinary number of polygons, which take time to construct and to render. To address the rendering bottleneck, we have developed a multipipe strategy for parallel rendering using a combination of CPUs and parallel graphics adaptors. The multipipe system uses multiple graphics adapters in parallel, the so called SGI Onyx2 Reality Monster. In this paper, we discuss the issues of using the multiple pipes in a Sort-Last fashion which out performs a single graphics adaptor for a surprisingly low number of polygons. © 1999 Eurographics Association. All rights reserved.

关键词： Program processors

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parallel data processing in a distributed object-oriented model

Parallel data processing in a distributed object-oriented mo...

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1999 International symposium on Distributed Objects and Applications, DOA 1999

作者： Monde, John R. Cobb, Maria

ISBN: (纸本)0769501826

The limitations of serial processors for managing large computationally intensive dataset problems in fields such as visualization and geographical information systems (GIS) are well known. parallel processing techniques, where one or many computational tasks are distributed across a number of processing elements, have been proposed as a solution to the problem. The paper presents a distributed object oriented visualization model being developed by the University of Southern Mississippi to demonstrate interactive visualization of oceanographic data. This model allows data location independence as well as data structure independence. The test case for which we present experimental results involves visualization of oceanographic data (salinity, sound speed profile, currents, temperature, and depth) with Windows NT Pentium class computers serving as both server and client workstations. © 1999 ieee.

关键词： visualization

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parallel accelerated isocontouring for out-of-core visualization

Parallel accelerated isocontouring for out-of-core visualiza...

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ieee parallel visualization and graphics symposium

作者： C.L. Bajaj V. Pascucci D. Thompson X.Y. Zhang Department of Computer Sciences and TICAM University of Technology Austin TX USA

We introduce a scheme for static analysis that allows us to partition large geometric datasets at multiple levels of granularity to achieve both load balancing in parallel computations and minimal access to secondary memory in out-of-core computations. The idea is illustrated and fully exploited for the case of isosurface extraction, but extendible to a class of algorithms based on a small set of parameters and for which an appropriate static analysis can be performed.

关键词： Acceleration Isosurfaces Load management data visualization data mining Partitioning algorithms Performance analysis Algorithm design and analysis data preprocessing Tree data structures

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Hybrid scheduling for parallel rendering using coherent ray tasks

Hybrid scheduling for parallel rendering using coherent ray ...

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ieee parallel visualization and graphics symposium

作者： E. Reinhard A. Chalmers F.W. Jansen University of Bristol Bristol Bristol GB

parallelising ray tracing with a data parallel approach allows rendering of arbitrarily large models, but the inherent load imbalances may lead to severe inefficiencies. To compensate for the uneven load distribution, demand-driven tasks may be split off and scheduled to processors that are less busy. We propose a hybrid scheduling algorithm which brings tasks and data together according to coherence between rays. The amount of demand-driven versus data parallel tasks is a function of the coherence between rays and the amount of imbalance in the basic data-parallel load. Processing power, communication and memory are three resources which should be evenly used. Our current implementation is assessed against these requirements, showing good scalability and very little communication at the cost of a slightly larger memory overhead.

关键词： Layout Processor scheduling Ray tracing Computer graphics Computational modeling Electrical capacitance tomography parallel processing Rendering (computer graphics) data communication Scheduling algorithm

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parallel visualization of large-scale aerodynamics calculations: a case study on the Cray T3E

Parallel visualization of large-scale aerodynamics calculati...

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ieee parallel visualization and graphics symposium

作者： Kwan-Liu Ma T.W. Crockett University of California Davis USA Institute of Computer Applications in Science and Engineering USA

ISBN: (纸本)0780359011

This paper reports the performance of a parallel volume rendering algorithm for visualizing a large-scale unstructured-grid dataset produced by a three-dimensional aerodynamics simulation. This dataset, containing over 18 million tetrahedra, allows us to extend our performance results to a problem which is more than 30 times larger than the one we examined previously. This high resolution dataset also allows us to see fine, three-dimensional features in the flow field. All our tests were performed on the SGI/Cray T3E operated by NASA's Goddard Space Flight Center. Using 511 processors, a rendering rate of almost 9 million tetrahedra/second was achieved with a parallel overhead of 26%.

关键词： large-scale systems Aerodynamics Computer aided software engineering Rendering (computer graphics) Testing parallel programming Concurrent computing data visualization Computer graphics Supercomputers

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Overlapping multi-processing and graphics hardware acceleration: performance evaluation

Overlapping multi-processing and graphics hardware accelerat...

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ieee parallel visualization and graphics symposium

作者： X. Cavin L. Alonso J.-C. Paul LORIA INRIA Lorraine France

Recently, multi-processing has been shown to deliver good performance in rendering. However, in some applications, processors spend too much time executing tasks that could be more efficiently done through intensive use of new graphics hardware. We present a novel solution combining multi-processing and advanced graphics hardware, where graphics pipelines are used both for classical visualization tasks and to advantageously perform geometric calculations while remaining computations are handled by multi-processors. The experiment is based on an implementation of a new parallel wavelet radiosity algorithm. The application is executed on the SGI Origin2000 connected to the SGI InfiniteReality2 rendering pipeline. A performance evaluation is presented. Keeping in mind that the approach can benefit all available workstations and super-computers, from small scale (2 processors and 1 graphics pipeline) to large scale (p processors and n graphics pipelines), we highlight some important bottlenecks that impede performance. However, our results show that this approach could be a promising avenue for scientific and engineering simulation and visualization applications that need intensive geometric calculations.

关键词： Hardware Acceleration Rendering (computer graphics) Computer graphics Application software Pipelines visualization parallel processing Solid modeling Workstations

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Scalable distributed visualization using off-the-shelf components

Scalable distributed visualization using off-the-shelf compo...

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ieee parallel visualization and graphics symposium

作者： A. Heirich L. Moll Tandem Labs. Compaq Comput. Corp. Houston TX USA

This paper describes a visualization architecture for scalable computer systems. The architecture is currently being prototyped for use in Beowulf-class clustered systems. A set of OpenGL frame buffers are driven in parallel by a set of CPUs. The visualization architecture merges the contents of these frame buffers by user programmable associative and commutative combining operations. The system hardware is built from off-the-shelf components including OpenGL accelerators, field programmable gate arrays (FPGAs), and gigabit network interfaces and switches. A second generation prototype supports 60 Hz operation at 1024/spl times/1024 pixel resolution with interactive latency up to 1000 nodes.

关键词： Computer architecture Computer graphics data visualization Prototypes Hardware Field programmable gate arrays Computer networks Laboratories Network interfaces Switches

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Exploiting frame coherence with the temporal depth buffer in a distributed computing environment

Exploiting frame coherence with the temporal depth buffer in...

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ieee parallel visualization and graphics symposium

作者： T.A. Davis E.W. Davis Clemson University USA North Carolina State University USA

We introduce the notion of a parallel temporal depth buffer (or t-buffer) to speed up the rendering process for ray traced animations. The t-buffer is a conceptually simple data structure which stores knowledge about coherent pixel values across the duration of an animation. Through the use of this information, we can potentially avoid recomputing a significant number of redundant pixel values and thus substantially reduce overall computing time. Although the t-buffer is general enough to be used with a variety of rendering methods, the algorithm employed in this work targets ray-traced animations and therefore readily lends itself to parallelization. A clustered (or distributed) computing environment is an efficient and effective candidate to handle the parallel computation due to its relatively low cost and the high computation to communication ratio inherent in the processing. The results from this method show substantial reductions in computation and overall rendering time with relatively low overhead.

关键词： Distributed computing Animation Rendering (computer graphics) parallel processing Ray tracing Pixel Computational efficiency Cameras data structures parallel algorithms

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