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

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

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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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Adaptive, multiresolution visualization of large data sets using a distributed memory octree

Adaptive, multiresolution visualization of large data sets u...

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1999 ACM/ieee Conference on Supercomputing, SC 1999

作者： Freitag, Lori A. Loy, Raymond M. Mathematics and Computer Science Division Argonne National Laboratory ArgonneIL60439 United States

ISBN: (纸本)1581130910

The interactive visualization and exploration of large scientific data sets is a challenging and difficult task;their size often far exceeds the performance and memory capacity of even the most powerful graphics workstations. To address this problem, we have created a technique that combines hierarchical data reduction methods with parallel computing to allow interactive exploration of large data sets while retaining full-resolution capability. The user may interactively change the resolution of the reduced data set either globally or by specifying a region of interest. In this way, high resolution can be obtained in local subregions without sacrificing graphics performance. We describe the software architecture of the system, give details pertaining to the use of a distributed memory octree used to create the reduced data set, and present performance results for the visualization of Rayleigh-Taylor instability and x-ray burst simulation data sets. © 1999 ieee.

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 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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Efficient visualization of graphical objects 12

Efficient visualization of graphical objects

引用

12th Brazilian symposium on Computer graphics and lmage Processing, SIBGRAPI 1999

作者： Frederick, P. Gattass, M. Mediano, M.R. TeCGraf Grupo de Tecnologia em Computação Gráfica Departamento de Informática PUC-Rio Rua Marquěs de São Vicente 225 Rio de Janeiro RJ22453-900 Brazil

ISBN: (纸本)0769504817

The use of appropriate data structures for storing sets of graphical objects can lead to great performance improvements in the visualization of large figures, such as maps and CAD drawings. We present a study on the performance of persistent data structures composed of an R-tree and V-trees, for storing and efficiently retrieving 2D graphical objects. Results are shown to demonstrate the efficiency of the proposed solutions when applied to large maps. © 1999 ieee.

关键词： data structures

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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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parallel ray casting of visible human on distributed memory architectures

Parallel ray casting of visible human on distributed memory ...

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

作者： Bajaj, Chandrajit Ihm, Insung Koo, Gee-Bum Park, Sanghun Dept. of Computer Sci. Univ. of Texas Austin United States Dept. of Computer Sci. Sogang Univ. Seoul Korea Republic of

ISBN: (纸本)9783709168035

This paper proposes a new parallel ray-casting scheme for very large volume data on distributed-memory architectures. Our method, based on data compression, attempts to enhance the speedup of parallel rendering by quickly reconstructing data from local memory rather than expensively fetching them from remote memory spaces. Furthermore, it takes the advantages of both object-order and image-order traversal algorithms: It exploits object-space and image-space coherence, respectively, by traversing a min-max octree block-wise and using a run-time quadtree which is maintained dynamically against pixels' opacity values. Our compression-based parallel volume rendering scheme minimizes communications between processing elements during rendering, hence is also very appropriate for more practical distributed systems, such as clusters of PCs and/or workstations, in which data communications between processors are regarded as quite costly. We report experimental results on a Cray T3E for the Visible Man dataset. © 1999 Eurographics Association. All rights reserved.

关键词： Volume rendering

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