BAJAJ, C., PASCUCCI, V., D.THOMPSON, AND ZHANG, X. 1999. Parallel accelerated isocontouring for out-of-core visualization. In Proc. IEEE Parallel Visualization and Graphics Sympos., 97--104.  Home/Search   Document Details and Download   Summary   Related Articles   Check

....that aims to hide the disk I O overhead by overlapping computation with I O. Basically, the authors have an I O thread that reads the active cells from disk, and several isosurface computation threads. Experimental results on relatively small regular grids are given in the paper. Bajaj et al. [8] also proposes a technique for out of core isosurface extraction. Their technique is an extension of their seed based technique for efficient isosurface extraction [7] The seed based approach works by saving a small set of seed cells, which can be used as starting points for an arbitrary ....

C. L. Bajaj, V. Pascucci, D. Thompson, and X. Y. Zhang. Parallel Accelerated Isocontouring for Out-of-Core Visualization. Symposium on Parallel Visualization and Graphics, 97--104. 1999.

....runtime overhead, and accepts their limitations in terms of potential popping artifacts that can occur as we switch between different LODs at runtime. A number of methods for out of core visualization including isosurface extraction, and rendering of large unstructured grids have been proposed [4, 8, 17]. 35, 12] presented application controlled segmentation paging methods for out of core visualization of computational fluid dynamics (CFD) data. 34] presented a number of techniques such as indexing, caching, and prefetching to improve the performance of walkthrough of a very large virtual ....

C. Bajaj, V. Pascucci, D. Thomson, and X. Y. Zhang. Parallel accelerated isocontouring for out-of-core visualization. In IEEE Parallel Visualization and Graphics Symposium, pages 87--104, 1999.

....out of core techniques have been developed for other geometric applications. In the graphics domain, these applications include large building walk throughs, radiosity, and ray tracing [9, 23, 18] In the visualization domain, several researchers have addressed out of core isosurface extraction [6, 5, 22, 2]; others have looked at visualization of terrain and computational fluid dynamics, including streamlines on meshes [8, 7, 24] Although our input is geometric, the problem of updating connectivity pointers in a topological data structure actually has a closer analogy in building object oriented ....

C. L. Bajaj, V. Pascucci, D. Thompson, and X. Y. Zhang. Parallel accelerated isocontouring for out-of-core visualization. In Proceedings

....Ellsiepen [15] gave a parallel algorithm for FEM data by distributing working blocks to a number of connected workstations, Shen et al. 41] developed a sequential and parallel approach called ISSUE, and Parker et al. 37] presented a parallel technique using ray tracing. In addition, Bajaj et al. [2] proposed a parallel and out of core approach based on contour propagation from seed cells. Sequential isosurface techniques for time varying data were given by Shen [43] and Sutton and Hansen [49] 2.2 Volume Rendering for Unstructured Grids A number of efficient algorithms for rendering ....

....algorithms, Cox and Ellsworth [13] presented applicationcontrolled demand paging methods, and Ueng el al. 51] proposed out of core streamline techniques. As mentioned, Chiang and Silva [7, 8] and Chiang et al. 9] gave a series of out of core algorithms for isosurface extraction, and Bajaj et al. [2] presented parallel and out of core isosurface techniques. Leutenegger and Ma [29] and Farias and Silva [17] developed out of core volume rendering approaches. Shen et al. 44] and Sutton and Hansen [49] reported out of core visualization for time varying datasets. For surface simplification, ....

C. Bajaj, V. Pascucci, D.Thompson, and X.Y. Zhang. Parallel accelerated isocontouring for out-of-core visualization. In Proceedings of IEEE Parallel Visualization and Graphics Symposium, pages 97--104, 1999.

....datasets. Examples of such applications include satellite data processing [24,27,62] full scale water contamination studies and surface subsurface petroleum reservoir simulations [44,66] visualization and processing of digitized microscopy images [3] visualization of largescale data [5,8,29,42,61], and data mining [4,7,34,68] Although the datasets used for analysis and the data products generated by applications that manipulate those datasets may differ in many ways, a close look at many dataintensive applications [17,21,31,42,44] reveals that there exist commonalities in their data ....

C. L. Bajaj, V. Pascucci, D. Thompson, and X. Y. Zhang. Parallel accelerated isocontouring for out-of-core visualization. In Proceedings of the

.... Recent improvements in scanning and storage technology, however, have lead to datasets as large as billions of triangles [19, 23] As a result, a number of methods, particularly for out of core visualization, have been proposed for coping with models that are too large to fit in main memory, e.g. [3, 5 8, 17, 24, 28, 31, 32]. Rossignac and Borrel proposed one of the earliest simplification algorithms [26] Their algorithm partitions space into cube like cells from a uniform rectilinear grid, and replaces all mesh vertices within a grid cell by a single representative vertex. While simple and fast, their method ....

C. Bajaj, V. Pascucci, D. Thompson, and X. Y. Zhang. Parallel Accelerated Isocontouring for Out-of-Core Visualization. Proceedings of IEEE Parallel Visualization and Graphics Symposium 1999, pages 97--104, October 1999.

....transport of one or more chemicals in the region being studied. Iso surface rendering is a method that is well suited for visualizing the density distributions of chemicals in the region. Figure 1 shows a rendering of the output from a reactive transport simulation. A number of research projects [2, 5, 6, 11] have examined algorithms and methods for the visualization of large, out of core datasets on workstations and parallel machines. Recent research on programming models for developing applications in a distributed environment has focused on the use of component based models [8] in which an ....

C. L. Bajaj, V. Pascucci, D. Thompson, and X. Y. Zhang. Parallel accelerated isocontouring for out-of-core visualization. In Proceedings of the 1999 IEEE Symposium on Parallel Visualization and Graphics, pages 97--104, San Francisco, CA, USA, Oct 1999.

....algorithms have been developed on high performance machines [9, 30, 31, 47, 26] Those research projects have focused on visualization of in core datasets. A number of research projects have focused on algorithms and methods for the exploration and visualization of large, out of core datasets [4, 13, 14, 41, 16]. Cox and Ellsworth [16] show that relying on operating system virtual memory results in poor performance. They propose a paged system and algorithms for memory management and paging for out of core visualization. Their results show that application controlled paging can substantially improve ....

C. L. Bajaj, V. Pascucci, D. Thompson, and X. Y. Zhang. Parallel accelerated isocontouring for out-of-core visualization. In Proceedings of the 1999 IEEE Symposium on Parallel Visualization and Graphics, pages 97--104, San Francisco, CA, USA, Oct 1999.

....out of core techniques have been developed for other geometric applications. In the graphics domain, these applications include large building walk throughs, radiosity, and ray tracing [22, 73, 54] In the visualization domain, several researchers have addressed out of core isosurface extraction [13, 12, 72, 4]; others have looked at visualization of terrain and computational fluid dynamics, including streamlines on meshes [16, 15, 76] For interactive walk throughs of large, densely occluded building environments, Teller developed efficient pre computation visibility algorithms and real time culling ....

....of the out of core interval tree data structure. Sulatycke and Ghose describe an out of core, parallel isosurface renderer that also uses an interval tree, focusing on reducing seek times as well as the number of disk I Os, and overlapping rendering computations with disk I O [72] Bajaj et al. [4] only index a small set of seed cells that are guaranteed to intersect each connected component of the desired isosurface. 20 Davis et al. discuss out of core terrain visualization [16] addressing the problem of interactive visualization of small subsets of a data set that is much larger than ....

C. L. Bajaj, V. Pascucci, D. Thompson, and X. Y. Zhang. Parallel accelerated isocontouring for out-of-core visualization. In Proceedings 1999 IEEE Parallel Visualization and Graphics Symposium, pages 97--104,122, San Francisco, CA, October 1999. IEEE.

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C. L. Bajaj, V. Pascucci, D. Thompson, and X. Y. Zhang. Parallel accelerated isocontouring for out-of-core visualization. In Proc. of Parallel Visualization and Graphics Symp., pages 97--104, 1999.

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C. L. Bajaj, V. Pascucci, D. Thompson, and X. Y. Zhang. Parallel accelerated isocontouring for out-of-core visualization. In Stephan N. Spencer, editor, Proceedings of the 1999 IEEE Parallel Visualization and Graphics Symposium (PVGS`99), pages 97--104, N.Y., October 25--26 1999. ACM Siggraph. Hierarchical Indexing for Out-of-Core Access to Multi-Resolution Data 15

....use of the memory structure is important when dealing with large data structures that do not fit in the main memory of a single computer. New algorithmic techniques and analysis tools have been developed to address this problem, e.g. for geometric algorithms [17 19] and scientific visualization [20, 21]. In most terrain visualization systems [2 4, 8, 22 26] the external memory component is essential for handling real terrain and GIS databases. Hoppe [8] addresses the problem of constructing a progressive mesh of a large terrain using a bottomup scheme, by decomposing the terrain into square ....

C. L. Bajaj, V. Pascucci, D. Thompson, and X. Y. Zhang, "Parallel accelerated isocontouring for out-of-core visualization," in Proceedings of the 1999.

....not fit in the main memory of a single computer since the access time to each memory unit is dependent on its location. New algorithmic techniques and analysis tools have been developed to address this problem for example in the case of geometric algorithms [14, 10, 1] or scientific visualization [7, 3]. Closely related issues emerge in the area of parallel and distributed computing where remote data transfer can become a primary bottleneck in the computation. In this context space filling curves [20] are often used as a tool to determine very quickly data distribution layouts that guarantee ....

C. L. Bajaj, V. Pascucci, D. Thompson, and X. Y. Zhang. Parallel accelerated isocontouring for out-of-core visualization. In Stephan N. Spencer, editor, Proceedings of the 1999.

....marching is used to generate the isosurface given the seed cells. Optimally, only one seed cell would be present on 60 each surface segment for any isovalue (so that the overhead for storing the interval tree would be small) Several methods for producing small seed sets are discussed. Bajaj, Pascucci, Thompson Zhang (1999) have adopted this technique to work in parallel for rectilinear meshes. Isocontouring has also been demonstrated with a more abstract mathematical approach called continuation, which is a technique for constructing a piecewise approximation of a continuous function defining a manifold. This work ....

Bajaj, C. L., Pascucci, V., Thompson, D. & Zhang, X. (1999), Parallel accelerated isocontouring for out-of-core visualization, in `IEEE Parallel Symposium on Visualization', San Francisco, CA.

....use of the memory structure is important when dealing with large data structures that do not fit in the main memory of a single computer. New algorithmic techniques and analysis tools have been developed to address this problem, e.g. for geometric algorithms [1,11,18] and scientific visualization [2, 4]. In most terrain visualization systems [5,6,8,12,15 17,19,21] the external memory component is essential for handling real terrain and GIS databases. Hoppe [15] addresses the problem of constructing a progressive mesh of a large terrain using a bottom up scheme, by decomposing the terrain into ....

C. L. Bajaj, V. Pascucci, D. Thompson, and X. Y. Zhang. Parallel Accelerated Isocontouring for Out-of-Core Visualization. Proceedings of the 1999 IEEE Parallel Visualization and Graphics Symposium, 97--104. Oct. 1999.

....disadvantages of image composition approaches for parallel rendering, describe our system in more detail, show results from our current software simulator, and describe our project s status and future plans. 2 Background and Related Work The fundamental problem in parallel real time rendering [2, 1] has always been the need for parallel access to frame buffer memory. This is just as true of multiprojector systems as it is for highperformance single display systems. As indicated in [10] parallel rendering schemes can be classified according to where in the graphics pipeline they perform the ....

C. Bajaj, V. Pascucci, D. Thompson, and X. Y. Zhang. Parallel accelerated isocontouring for out-of-core visualization. In Proceedings of IEEE Parallel Visualization and Graphics Symposium, pages 97--104, October 1999.

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BAJAJ, C., PASCUCCI, V., D.THOMPSON, AND ZHANG, X. 1999. Parallel accelerated isocontouring for out-of-core visualization. In Proc. IEEE Parallel Visualization and Graphics Sympos., 97--104.

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C. L. Bajaj, V. Pascucci, D. Thompson, and X. Y. Zhang. Parallel accelerated isocontouring for out-of-core visualization. In Proc. of the Symp. on Parallel Visualization and Graphics, pages 97--104. IEEE, ACM Press, 1999.

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C.L. Bajaj, V. Pascucci, D. Thompson and X.Y. Zhang, Parallel Accelerated Isocontouring for Out-of-Core Visualization, 1999 IEEE Symposium on Parallel Visualization and Graphics, pp. 97-104, ACM Press, 1999.

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C. L. Bajaj, V. Pascucci, D. Thompson, and X. Y. Zhang, "Parallel accelerated isocontouring for out-of-core visualization," in Proceedings of Parallel Visualization and Graphics Symposium 1999, pp. 97--122, IEEE, Oct. 25--26 1999.

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C. Bajaj, V. Pascucci, D. Thompson, and X. Zhang, "Parallel accelerated isocontouring for out-of-core visualization, " in Proceedings of Parallel Visualization and Graphics Symposium 1999.

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C. L. Bajaj, V. Pascucci, D. Thompson, and X. Y. Zhang. Parallel Accelerated Isocontouring for Out-of-Core Visualization. Symposium on Parallel Visualization and Graphics, 97--104. 1999.

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