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Volume rendering for relational data

Volume rendering for relational data

引用

ieee symposium on Information visualization (INFOVIS)

作者： B.G. Becker Silicon Graphics Inc. Mountain View CA USA

A method for efficiently volume rendering dense scatterplots of relational data is described. Plotting difficulties that arise from large numbers of data points, categorical variables, interaction with non-axis dimensions, and unknown values, are addressed by this method. The domain of the plot is voxelized using binning and then volume rendering. Since a table is used as the underlying data structure, no storage is wasted on regions with no data. The opacity of each voxel is a function of the number of data points in a corresponding bin. A voxel's color is derived by averaging the value of one of the variables for all the data points that fall in a bin. Other variables in the data may be mapped to external query sliders. A dragger object permits a user to select regions inside the volume.

关键词： Scattering Data visualization Rendering (computer graphics) Relational databases Data structures Silicon graphics Stacking Data compression Shape

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Metrics for effective information visualization

Metrics for effective information visualization

引用

ieee symposium on Information visualization (INFOVIS)

作者： R. Brath Visible Decision Inc. Toronto Ont. Canada

Metrics for information visualization will help designers create and evaluate 3D information visualizations. Based on experience from 60+ 3D information visualizations, the metrics we propose are: number of data points and data density; number of dimensions and cognitive overhead; occlusion percentage; and reference context and percentage of identifiable points.

关键词： Data visualization Guidelines Layout Navigation graphics Information geometry Testing Three dimensional displays Two dimensional displays Multidimensional systems

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The structure of the information visualization design space

The structure of the information visualization design space

引用

ieee symposium on Information visualization (INFOVIS)

作者： S.K. Card J. Mackinlay Xerox-PARC Palo Alto CA USA

Research on information visualization has reached the point where a number of successful point designs have been proposed and a variety of techniques have been discovered. It is now appropriate to describe and analyze portions of the design space so as to understand the differences among designs and to suggest new possibilities. This paper proposes an organization of the information visualization literature and illustrates it with a series of examples. The result is a framework for designing new visualizations and augmenting existing designs.

关键词： Data visualization Space technology graphics Data communication Taxonomy Color Visual communication Arithmetic Information analysis

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Adaptive information visualization based on the user's multiple viewpoints-interactive 3D visualization of the WWW

Adaptive information visualization based on the user's multi...

引用

ieee symposium on Information visualization (INFOVIS)

作者： T. Teraoka M. Maruyama Advanced Technology R&D Center Mitsubishi Electric Corporation Limited Amagasaki Japan Faculty of Engineering Shinshu University Nagano Japan

We introduce the adaptive information visualization method for hypermedia and the WWW based on the user's multiple viewpoints. We propose two graphical interfaces, the CVI and the RF-Cone. The CVI is the interface for interactive viewpoint selection. We can select a viewpoint reflecting our interests by using the CVI. According to the given viewpoint, the RF-Cone adaptively organizes the 3D representation of the hypermedia so that we can understand the semantic and structural relationship of the hypermedia and easily retrieve the information. Combining these methods, we have developed the WWW visualization system which can provide highly efficient navigation.

关键词： visualization World Wide Web Navigation Information retrieval Computer graphics Character generation Research and development Hardware Workstations Personal communication networks

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ParVox-a parallel splatting volume rendering system for distributed visualization 97

ParVox-a parallel splatting volume rendering system for dist...

引用

parallel Rendering symposium

作者： P.P. Li S. Whitman R. Mendoza J. Tsiao Jet Propulsion Laboratory USA Equator Technologies Inc.

ISBN: (纸本)9781581130102

The paper presents a parallel volume rendering system, ParVox, for large volumes of 4D data sets in regular structured grids. A parallel volume rendering API based on the splatting algorithm constitutes the core of the ParVox system. A network interface program takes commands from an X Window based GUI, calls the API to perform the rendering functions, compresses the rendered images and sends them back to the GUI window. The ParVox system is designed for interactive, distributed visualization of large multiple time steps, multiple parameters volume datasets. The parallel splatting algorithm employs both object space decomposition and image space decomposition; an asynchronous image compositing scheme based on the direct send model reduces both the communication overhead and the synchronization overhead. The ParVox system architecture, the parallel algorithm and its implementation on the Cray T3D and the parallel wavelet compression algorithm are discussed extensively. The performance results and some optimization techniques are also presented.

关键词： Rendering (computer graphics) Data visualization Partitioning algorithms Shearing Propulsion Laboratories Casting Round robin Image analysis Algorithm design and analysis

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Managing multiple focal levels in Table Lens

Managing multiple focal levels in Table Lens

引用

ieee symposium on Information visualization (INFOVIS)

作者： T. Tenev R. Rao Xerox Palo Alto Research Center Inxight Software Inc. Palo Alto CA USA

The Table Lens, focus+context visualization for large data tables, allows users to see 100 times as many data values as a spreadsheet in the same screen space in a manner that enables an extremely immediate form of exploratory data analysis. In the original Table Lens design, data are shown in the context area using graphical representations in a single pixel row. Scaling up the Table Lens technique beyond approximately 500 cases (rows) by 40 variables (columns) requires not showing every value individually and thus raises challenges for preserving the exploratory and navigational ease and power of the original design. We describe two design enhancements for introducing regions of less than a pixel row for each data value and discuss the issues raised by each.

关键词： Lenses Optical design Navigation Data visualization Data analysis Displays Rendering (computer graphics)

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A scalable parallel cell-projection volume rendering algorithm for three-dimensional unstructured data 97

A scalable parallel cell-projection volume rendering algorit...

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parallel Rendering symposium

作者： Kwan-Liu Ma T.W. Crockett Institute for Computer Applications in Science and Engineering NASA-Langley Research Center Hampton VA USA

ISBN: (纸本)9781581130102

Visualizing three dimensional unstructured data from aerodynamics calculations is challenging because the associated meshes are typically large in size and irregular in both shape and resolution. The goal of this research is to develop a fast, efficient parallel volume rendering algorithm for massively parallel distributed memory supercomputers consisting of a large number of very powerful processors. We use cell projection instead of ray casting to provide maximum flexibility in the data distribution and rendering steps. Effective static load balancing is achieved with a round robin distribution of data cells among the processors. A spatial partitioning tree is used to guide the rendering, optimize the image compositing step, and reduce memory consumption. Communication cost is reduced by buffering messages and by overlapping communication with rendering calculations as much as possible. Tests on the IBM SP2 demonstrate that these strategies provide high rendering rates and good scalability. For a dataset containing half a million tetrahedral cells, we achieve two frames per second for a 400/spl times/400 pixel image using 128 processors.

关键词： Rendering (computer graphics) Round robin Data visualization Aerodynamics Shape Supercomputers Casting Load management Costs Testing

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Virtual collaborative simulation environment for integrated product and process development

Virtual collaborative simulation environment for integrated ...

引用

5th ieee International symposium on High Performance Distributed Computing

作者： Harrison, JP Christensen, B Gulli, M Bianco, J DENEB ROBOT INC AUBURN HILLSMI 48331

ISBN: (纸本)0818675829

A Virtual Collaborative Engineering (VCE) capability for Integrated Product and Process Design (IPPD) has been demonstrated which allows distributed, real-time visualization and evaluation of design concepts, manufacturing processes, the total factory, and enterprises in one seamless simulation environment. Deneb's VCE environment provides a distributed, real-time interactive capability for realistic engineering 3D simulations to link integrated product teams over wide area networks. Engineers, manufacturing personnel, system operators and users are able to interactively evaluate design concepts, manufacturing workcells, processes, and factory layouts in the Deneb dynamic simulation environment at geographically remote locations to support informal and formal IPPD meetings. Anyone on the network having Deneb's simulation software and VCE capability can assume control of the simulation and make changes in real-time that can be visualized by others on the network.

关键词： computer-aided manufacturing continuous simulation discrete simulation graphics packages network

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Cube-4-a scalable architecture for real-time volume rendering

Cube-4-a scalable architecture for real-time volume renderin...

引用

ieee symposium on Volume visualization and graphics

作者： H. Pfister A. Kaufman Department of Computer Science State University of New York Stony Brook Stony Brook NY USA

We present Cube-4, a special-purpose volume rendering architecture that is capable of rendering high-resolution (e.g., 1024/sup 3/) datasets at 30 frames per second. The underlying algorithm, called slice-parallel ray-casting, uses tri-linear interpolation of samples between data slices for parallel and perspective projections. The architecture uses a distributed interleaved memory, several parallel processing pipelines, and an innovative parallel data flow scheme that requires no global communication, except at the pixel level. This leads to local, fixed bandwidth interconnections and has the benefits of high memory bandwidth, real-time data input, modularity, and scalability. We have simulated the architecture and have implemented a working prototype of the complete hardware on a configurable custom hardware machine. Our results indicate true real-time performance for high-resolution datasets and linear scalability of performance with the number of processing pipelines.

关键词： Rendering (computer graphics) Hardware Computer architecture Pipelines Bandwidth Solid modeling Computer graphics Data visualization Costs Computer science

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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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