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Case study: mantle convection visualization on the Cray T3D

Case study: mantle convection visualization on the Cray T3D

引用

ieee Conference on visualization

作者： J.S. Painter H.-P. Bunge Y. Livnat Advanced Computing Laboratory Los Alamos National Laboratory USA Institute of GeoPhysics and Planetary Physics Los Alamos National Laboratory USA Department of Computer Science University of Utah USA

The recent years have seen rapid advancement towards viewing the Earth as an integrated system. This means that we have come to understand the interdependence of the major planetary subsystems-atmosphere, biosphere, oceans and the deep earth interior-on a large range of time and length scales. One of the longest time scales of the planet is imposed by solid state convection within the silicate Earth mantle. Mantle convection modeling, and other earth science modeling efforts, now are producing simulation data on grids that are large enough to strain the memory and processing power of even the largest high-end graphics workstations. Another alternative is to use parallel visualization tools running on the massively parallel computers that generated the data. This is the approach that we have taken for the visualization of mantle convection simulation data.

关键词： Earth Computational modeling data visualization Biosphere Oceans Planets Solid state circuits Geoscience Capacitive sensors Computer graphics

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Isosurfacing in span space with utmost efficiency (ISSUE) 96

Isosurfacing in span space with utmost efficiency (ISSUE)

引用

ieee Conference on visualization

作者： Han-Wei Shen C.D. Hansen Y. Livnat C.R. Johnson Dept. of Comput. Sci. Utah Univ. Salt Lake City UT USA Advanced Computing Laboratory Los Alamos National Laboratory Los Alamos NM USA Department of Computer Science University of Utah Salt Lake UT USA

ISBN: (纸本)9780897918640

We present efficient sequential and parallel algorithms for isosurface extraction. Based on the Span Space data representation, new data subdivision and searching methods are described. We also present a parallel implementation with an emphasis on load balancing. The performance of our sequential algorithm to locate the cell elements intersected by isosurfaces is faster than the Kd tree searching method originally used for the Span Space algorithm. The parallel algorithm can achieve high load balancing for massively parallel machines with distributed memory architectures.

关键词： Isosurfaces data visualization Workstations Laboratories Computer science Cities and towns data mining High performance computing large-scale systems Computer graphics

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Direct volume rendering with shading via three-dimensional textures

Direct volume rendering with shading via three-dimensional t...

引用

ieee symposium on Volume visualization and graphics

作者： A. Van Gelder K. Kim Computer Science Department University of California Santa Cruz CA USA Computer Science Department University of California Santa Cruz USA University of California Santa Cruz Santa Cruz CA US

A new and easy-to-implement method for direct volume rendering that uses 3D texture maps for acceleration, and incorporates directional lighting, is described. The implementation, called Voltx, produces high-quality images at nearly interactive speeds on workstations with hardware support for three-dimensional texture maps. Previously reported methods did not incorporate a light model, and did not address issues of multiple texture maps for large volumes. Our research shows that these extensions impact performance by about a factor of ten. Voltx supports orthographic, perspective, and stereo views. This paper describes the theory and implementation of this technique, and compares it to the shear-warp factorization approach. A rectilinear data set is converted into a three-dimensional texture map containing color and opacity information. Quantized normal vectors and a lookup table provide efficiency. A new tesselation of the sphere is described, which serves as the basis for normal-vector quantization. A new gradient-based shading criterion is described, in which the gradient magnitude is interpreted in the context of the field-data value and the material classification parameters, and not in isolation. In the rendering phase, the texture map is applied to a stack of parallel planes, which effectively cut the texture into many slabs. The slabs are composited to form an image.

关键词： Rendering (computer graphics) Hardware Acceleration Slabs Degradation Workstations Table lookup Quantization Computer graphics visualization

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On the semantics of interactive visualizations

On the semantics of interactive visualizations

引用

ieee symposium on Information visualization (INFOVIS)

作者： M.C. Chuah S.F. Roth School of Computer Science Carnegie Mellon University Pittsburgh PA USA

Interactive techniques are powerful tools for manipulating visualizations to analyze, communicate and acquire information. This is especially true for large data sets or complex 3D visualizations. Although many new types of interaction have been introduced recently, very little work has been done on understanding what their components are, how they are related and how they can be combined. This paper begins to address these issues with a framework for classifying interactive visualizations. Our goal is a framework that will enable us to develop toolkits for assembling visualization interfaces both interactively and automatically.

关键词： data visualization User interfaces Mice Computer science Information analysis Assembly graphics Hardware Information filtering Information filters

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Hardware assisted volume rendering of unstructured grids by incremental slicing

Hardware assisted volume rendering of unstructured grids by ...

引用

ieee symposium on Volume visualization and graphics

作者： R. Yagel D.M. Reed A. Law Po-Wen Shih N. Shareef Department of Computer and Information Science Ohio State Uinversity USA

Some of the more important research results in computational science rely on the use of simulation methods that operate on unstructured grids. However, these grids, composed of a set of polyhedra, introduce exceptional problems with respect to data visualization. Volume rendering techniques, originally developed to handle rectangular grids, show significant promise for general use with unstructured grids as well. The main disadvantage of this approach, compared to isosurfaces, particles or other visualization tools is its non-interactive performance. We describe an efficient method for rendering unstructured grids that is based on incremental slicing and hardware polygon rendering. For a given view direction, the grid vertices are transformed to image space using available graphics hardware. We then incrementally compute the 2D polygon-meshes that result from letting a set of planes, parallel to the screen plane, intersect (slice) the transformed grid. Finally, we use the graphics hardware to render (interpolate-fill) the polygon-meshes and composite them in visibility order. We show that, in addition to being faster than existing methods, our approach also provides adaptive control and progressive image generation. The adaptive method provides user control to ensure that the contribution of every cell is included in the final image or to limit the number of cells that are missed.

关键词： Hardware Rendering (computer graphics) Grid computing data visualization graphics Adaptive control Computational modeling Isosurfaces Concurrent computing Image generation

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Hierarchical and parallelizable direct volume rendering for irregular and multiple grids 96

Hierarchical and parallelizable direct volume rendering for ...

引用

ieee Conference on visualization

作者： J. Wilhelms A. Van Gelder P. Tarantino J. Gibbs University of California Santa Cruz USA

ISBN: (纸本)9780897918640

A general volume rendering technique is described that efficiently produces images of excellent quality from data defined over irregular grids having a wide variety of formats. Rendering is done in software, eliminating the need for special graphics hardware, as well as any artifacts associated with graphics hardware. Images of volumes with about 1,000,000 cells can be produced in one to several minutes on a workstation with a 150-MHz processor. A significant advantage of this method for applications such as computational fluid dynamics is that it can process multiple intersecting grids. Such grids present problems for most current volume rendering techniques. Also, the wide range of cell sizes does not present difficulties, as it does for many techniques. A spatial hierarchical organization makes it possible to access data from a restricted region efficiently. The tree has greater depth in regions of greater detail, determined by the number of cells in the region. It also makes it possible to render useful "preview" images very quickly by displaying each region associated with a tree node as one cell. Previews show enough detail to navigate effectively in very large data sets. The algorithmic techniques include use of a k-d tree, with prefix-order partitioning of triangles, to reduce the number of primitives that must be processed for one rendering, coarse-grain parallelism for a shared-memory MIMD architecture, a new perspective transformation that achieves greater numerical accuracy, and a scanline algorithm with depth sorting and a new clipping technique.

关键词： Rendering (computer graphics) graphics Hardware Partitioning algorithms Workstations Application software Computational fluid dynamics Navigation parallel processing Sorting

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Fast isocontouring for improved interactivity

Fast isocontouring for improved interactivity

引用

ieee symposium on Volume visualization and graphics

作者： C.L. Bajaj V. Pascucci D.R. Schikore Department of Computer Sciences Purdue University West Lafayette USA Purdue University System West Lafayette IN US

We present an isocontouring algorithm which is near-optimal for real-time interaction and modification of isovalues in large datasets. A preprocessing step selects a subset S of the cells which are considered as seed cells. Given a particular isovalue, all cells in S which intersect the given isocontour are extracted using a high-performance range search. Each connected component is swept out using a fast isocontour propagation algorithm. The computational complexity for the repeated action of seed point selection and isocontour propagation is O(log n'+k), where n' is the size of S and k is the size of the output. In the worst case, n'=O(n), where n is the number of cells, while in practical cases, n' is smaller than n by one to two orders of magnitude. The general case of seed set construction for a convex complex of cells is described, in addition to a specialized algorithm suitable for meshes of regular topology, including rectilinear and curvilinear meshes.

关键词： data visualization data mining Topology Image analysis Computational complexity Computer displays Automatic control USA Councils Statistics Acceleration

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Remote interactive visualization and analysis (RIVA) using parallel supercomputers 95

Remote interactive visualization and analysis (RIVA) using p...

引用

Proceedings of the 1995 parallel Rendering symposium

作者： Li, P.Peggy Duquette, William H. Curkendall, David W. Jet Propulsion Lab Pasadena CA United States

ISBN: (纸本)9780897917742

JPL's Remote Interactive visualization and Analysis System (RIVA) is described in detail. RIVA's kernel is a highly scalable perspective renderer tailored especially for the demands of large datasets beyond the sensible reach of workstations. The algorithmic details of this renderer are described, particularly the aspects key to achieving the algorithm's overall scalability. The paper summarizes the performance achieved for machine sizes up to more than 500 nodes and for initial input image/terrain bases of up to a gigabyte. The RIVA system integrates workstation graphics, massively parallel computing technology, and gigabit communication networks to provide a flexible interactive environment for scientific data perusal, analysis and visualization. Early experience with using RIVA to interactively explore multivariate datasets is reported and some example results given.

关键词： Interactive computer graphics

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parallel volume ray-casting for unstructured-grid data on distributed-memory architectures 95

Parallel volume ray-casting for unstructured-grid data on di...

引用

Proceedings of the 1995 parallel Rendering symposium

作者： Ma, Kwan-Liu NASA Langley Research Cent Hampton VA United States

ISBN: (纸本)9780897917742

As computing technology continues to advance, computational modeling of scientific and engineering problems produces data of increasing complexity: large in size and unstructural in shape. Volume visualization of such data is a challenging problem. This paper proposes a distributed parallel solution that makes ray-casting volume rendering of unstructured-grid data practical. Both the data and the rendering process are distributed among processors. At each processor, ray-casting of local data is performed independent of the other processors. The global image compositing processes, which require inter-processor communication, are overlapped with the local ray-casting processes to achieve maximum parallel efficiency. This algorithm differs from previous ones in four ways: it is completely distributed, less view-dependent, reasonably scalable, and flexible. Without dynamic load balancing, test results on the Intel Paragon using from two to 128 processors show, on average, about 60% parallel efficiency.

关键词： Three dimensional computer graphics

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parallel volume rendering

Parallel volume rendering

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Proceedings of the ieee 9th International parallel Processing symposium

作者： Westermann, Ruediger German Natl Research Cent for Computer Science San Augustin Germany

During the last years several methods have been developed to visualize three dimensional volume data on multiprocessor computer systems. Most of these algorithms were strongly adapted to the underlying target architecture, and often did not take account of requirements such as scalability, portability, or memory minimization. The following paper outlines a new approach to rendering large scale volume data on distributed memory parallel computers. Within this framework, the only limiting factor concerning the resolution of the processed data is the node local memory. Furthermore, porting to other multiprocessor systems is straight forward, and scalability with increasing numbers of processors is achieved.

关键词： Three dimensional computer graphics

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