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Hypervolume visualization: A challenge in simplicity

Hypervolume visualization: A challenge in simplicity

引用

ieee symposium on Volume visualization

作者： Bajaj, CL Pascucci, V Rabbiolo, G Schikore, DR Univ Texas Dept Comp Sci Austin TX 78712 USA

ISBN: (纸本)1581131054

Hyper-volume visualization is designed to provide simple and fully explanatory images that give comprehensive insights into the global structure of scalar fields of any dimension. The basic idea is to have a dimension independent viewing system that scales nicely with the geometric dimension of the dataset and that can be combined with classical approaches like isocontouring and animation of slices of no data. We completely abandon (for core simplicity) rendering techniques, such as hidden surface removal or lighting or radiosity, that enhance three dimensional realism and concentrate on the real-time display of images that highlight structural (topological) features of the no dataset (holes, tunnels, cavities, depressions, extrema, etc). Hyper-volume visualization on the one hand is a generalization of direct parallel projection methods in volume rendering. To achieve efficiency (and real-time performance on a graphics workstation) we combine the advantages of (i) a hierarchical representations of the hyper-volume data for multiresolution display and (ii) generalized object space splatting combined with texture-mapped graphics hardware acceleration. The development of a system that implements display techniques for multidimensional datasets requires careful design of both algorithms and user interfaces that scale linearly with the dimension of the input geometric space. This is a major challenge since straightforward generalizations of standard techniques that are suitable for display of 3D data yield exceedingly intricate interfaces. For example, a view manipulation graphical user interface is usually based on a rotation of the object about Cartesian rotation axes, with possibly unit quaternions internal representations for the rotation group. Unfortunately the number of independent rotation axes grows quadratically with dimension(three in 3D to six in 4D to ten in 5D to fifteen in 6D space). Going back to the basics of parallel projections, we develop an alternat

关键词： Graphical user interfaces

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A real-time volume rendering architecture using an adaptive resampling scheme for parallel and perspective projections

A real-time volume rendering architecture using an adaptive ...

引用

1998 ieee symposium on Volume visualization, VVS 1998

作者： Ogata, Masato Ohkami, Takahide Lauer, Hugh C. Pfister, Hanspeter Mitsubishi Electric Information Technology Center America 201 Broadway CambridgeMA02139 United States Mitsubishi Electric Corporation Japan

ISBN: (纸本)1581131054

This paper describes an object-order real-time volume rendering architecture using an adaptive resampling scheme to perform resampling operations in a unified parallel-pipeline manner for both parallel and perspective projections. Unlike parallel projections, perspective projections require a variable resampling structure due to diverging perspective rays. In order to address mis issue, we propose an adaptive pipelined convolution block for resampling operations using the level of resolution to keep the parallel-pipeline structure regular. We also propose to use multi-resolution dataseis prepared for different levels of grid resolution to bound the convolution operations. The proposed convolution block is organized using a systolic array structure, which works well with a distributed skewed memory for conflict-free accesses of voxels. We present the results of some experiments with our software simulators of the proposed architecture and discuss about important technical issues. Copyright 1998 ieee.

关键词： Convolution

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Using PVM and MPI for co-processed, distributed and parallel scientific visualization 12th

引用

10 Workshops held in conjunction with 12th International parallel symposium and 9th symposium on parallel and Distributed Processing, IPPS/SPDP 1998

作者： Haimes, Robert Jordan, Kirk E. Department of Aeronautics and Astronautics Massachusetts Institute of Technology United States IBM Corporation 404 Wyman Street WalthamMA02254 United States

ISBN: (纸本)3540643591

This paper discusses the combined use of MPI and PVM in the parallel visualization tool kit, pV3. The implementation provides for efficient co-processed, distributed parallel visualization of large-scale 3D time dependent simulations. The primary goals of pV3 include the ability;to handle large-scale transient 3D simulations, to take full advantage of available hardware encompassing both parallel compute engines and graphics workstations, to visualize the data as the computation progresses, to interact and interrogate the data as its computed, and to steer the simulation by adjusting parameters obtaining immediate feedback from the changes. Based on a client/server model, the original implementation of pV3 was founded on PVM. The client portion executes coupled closely with the application code and ‘extracts’ from the distributed data volume, in place, lower dimensional data. The distilled data is transferred to the interactive server portion of pV3 (executing on a graphics workstation) where the rendering and display are performed. This unique architecture frees up the compute engine(s) from dealing with the graphics, and reduces the large data-set to a size that can be rapidly transported to the server using standard network connections. There are some drawbacks in using PVM on parallel machines which stem from TCP/IP communications. These include, in some instances, not taking full advantage of the hardware interconnect on the machine as communication must occur with the graphics workstation. This can result in smaller messages and increased latency. In addition, pV3’s dynamic attachment required that the graphics workstation be accessible from each node on the machine with PVM's ‘group’ functionality intact, which poses a problem on some parallel systems. The pV3 ‘concentrator’ module was designed to overcome such problems on distributed memory platforms. All pV3 messages on the parallel machine use the high-speed interconnect via the MPI protocol. Communication

关键词： Engines

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Proceedings of the 1998 ieee symposium on Volume visualization, VVS 1998

Proceedings of the 1998 IEEE Symposium on Volume Visualizati...

引用

1998 ieee symposium on Volume visualization, VVS 1998

ISBN: (纸本)1581131054

The proceedings contain 18 papers. The topics discussed include: coloring voxel-based objects for virtual endoscopy;probabilistic segmentation of volume data for visualization using SOM-PNN classifier;semi-automatic generation of transfer functions for direct volume rendering;adaptive perspective ray casting;a real-time volume rendering architecture using an adaptive resampling scheme for parallel and perspective projections;an exact interactive time visibility ordering algorithm for polyhedral cell complexes;volume animation using the skeleton tree;3D scan conversion of CSG models into distance volumes;adding shadows to a texture-based volume renderer;edge presentation in volume rendering using splatting;using distance maps for accurate surface representation in sampled volumes;wavelet based adaptive interpolation for volume rendering;object voxelization by filtering;an accurate method for voxelizing polygon meshes;extracting ISO-valued features in 4-dimensional scalar fields;and opaci@-weighted color interpolation for volume sampling.

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Hypervolume visualization: a challenge in simplicity

Hypervolume visualization: a challenge in simplicity

引用

ieee symposium on Volume visualization and graphics

作者： C.L. Bajaj V. Pascucci G. Rabbiolo D.R. Schikore Department of Computer Sciences and TICAM University of Technology Austin TX USA Department of Mathematics Purdue University West Lafayette IN USA Center for Applied Scientific Computing Lawrence Livemore National Laboratory Livermore CA USA

Hypervolume visualization is designed to provide simple and fully explanatory images that give comprehensive in-sights into the global structure of scalar fields of any dimension. The basic idea is to have a dimension independent viewing system that scales nicely with the geometric dimension of the dataset and that can be combined with classical approaches like isocontouring and animation of slices of nD data. One completely abandons (for core simplicity) rendering techniques, such as hidden surface removal or lighting or radiosity, that enhance three dimensional realism and concentrate on the real-time display of images that highlight structural (topological) features of the no dataset (holes, tunnels, cavities, depressions, extrema, etc.). Hypervolume visualization on the one hand is a generalization of direct parallel projection methods in volume rendering. To achieve efficiency (and real-time performance on a graphics workstation) the authors combine the advantages of (i) a hierarchical representations of the hypervolume data for multiresolution display and (ii) generalized object space splatting combined with texture-mapped graphics hardware acceleration. The main results of the paper are thus both a multiresolution direct rendering algorithm and scalable graphical user interface that provides global views of scalar fields in any dimension, while maintaining the fundamental characteristics of ease of use, and quick exploratory user interaction.

关键词： Rendering (computer graphics) graphics Animation Three dimensional displays Data visualization Workstations Hardware Acceleration Graphical user interfaces

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A real-time volume rendering architecture using an adaptive resampling scheme for parallel and perspective projections

A real-time volume rendering architecture using an adaptive ...

引用

ieee symposium on Volume visualization and graphics

作者： M. Ogata T. Ohkami H.C. Lauer H. Pfister Mitsubishi Electric Corporation Limited Japan

The paper describes an object order real time volume rendering architecture using an adaptive resampling scheme to perform resampling operations in a unified parallel pipeline manner for both parallel and perspective projections. Unlike parallel projections, perspective projections require a variable resampling structure due to diverging perspective rays. In order to address this issue, we propose an adaptive pipelined convolution block for resampling operations using the level of resolution to keep the parallel pipeline structure regular. We also propose to use multi resolution datasets prepared for different levels of grid resolution to bound the convolution operations. The proposed convolution block is organized using a systolic array structure, which works well with a distributed skewed memory for conflict free accesses of voxels. We present the results of some experiments with our software simulators of the proposed architecture and discuss important technical issues.

关键词： Convolution Pipelines Systolic arrays Computer architecture

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Hierarchical graphics databases in sort-first 97

Hierarchical graphics databases in sort-first

引用

ieee 3rd parallel Rendering symposium (PRS 97) / ieee visualization 97

作者： Mueller, C UNC-CH Computer Science

ISBN: (纸本)1581130104

Sort-first architectures for parallel rendering use the natural frame-to-frame coherence of primitives on the screen to increase performance by grouping primitives that are close together on the screen onto the same processor. This technique reduces processor-to-processor communications overhead. As primitives move on the screen, they may also be moved to other processors. This migration poses many problems for the editing and traversal of hierarchical graphics databases (HGD's) such as PHIGS. In this paper we describe the major problems associated with implementing an HGD on a sort-first system. We discuss the basics of HGD's and how they extend to parallel graphics systems. We show why bookkeeping for HGD's is a more complex issue for sort-first than for other parallel architectures. We then examine two possible solution branches for this issue and delve into the design choices and implementation issues that arise with either method. The methods differ in the amount of bookkeeping that they do versus the amount of primitive cull-testing that must be performed.

关键词： computer image generation parallel computing MIMD sort-first hierarchical graphics database

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Maintaining dynamic geometric objects on parallel processors 97

Maintaining dynamic geometric objects on parallel processors

引用

ieee 3rd parallel Rendering symposium (PRS 97) / ieee visualization 97

作者： Garmann, R Informatik VII Universität Dortmund

ISBN: (纸本)1581130104

parallelizing dynamic scientific applications involves solving the dynamic load balancing problem. The balancing should take the communication requirements of the application into account. Especially in the field of computer graphics many problems are dealing with objects in k-dimensional space with very special communication patterns. We describe a load balancing strategy based on a geometric clustering of objects with provable good performance, that is well suited to applications with interdependencies between neighbouring objects or between objects that have al least one coordinate in common.

关键词： dynamic load balancing parallel scientific computing distributed data structures rendering application geometric objects clustering locality orthogonal communication pattern

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parallel rendering techniques for massively parallel visualization

Parallel rendering techniques for massively parallel visuali...

引用

2nd AIZU International symposium on parallel Algorithms/Architecture Synthesis

作者： Hansen, C Krogh, M Painter, J Los Alamos Natl Lab Los Alamos United States

ISBN: (纸本)0818678704

As the resolution of simulation models increases, scientific visualization algorithms which take advantage of the large memory and parallelism of Massively parallel Processors (MPPs) are becoming increasingly important. For large applications rendering on the MPP tends to be preferable to rendering on a graphics workstation due to the MPP's abundant resources: memory, disk, and numerous processors. The challenge becomes developing algorithms that carl exploit these resources while minimizing overhead, typically communication costs. This paper will describe recent efforts in parallel rendering for polygonal primitives as well as parallel volumetric techniques. This paper presents rendering algorithms, developed for massively parallel processors (MPPs), for polygonal, spheres, and volumetric data. The polygon algorithm uses a data parallel approach whereas the sphere and volume render use a MIMD approach. Implementations for these algorithms are presented far the Thinking Machines Corporation CM-5 and the Cray Research Inc T3D.

关键词： parallel algorithms

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parallel rendering techniques for massively parallel visualization

Parallel rendering techniques for massively parallel visuali...

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Aizu International symposium on parallel Algorithms/Architecture Synthesis

作者： C. Hansen M. Krogh J. Painter Advanced Computing Laboratory Los Alamos National Laboratory Los Alamos NM USA

As the resolution of simulation models increases, scientific visualization algorithms which take advantage of the large memory and parallelism of massively parallel processors (MPPs) are becoming increasingly important. For large applications, rendering on an MPP tends to be preferable to rendering on a graphics workstation, due to the MPP's abundant resources: memory, disk and numerous processors. The challenge is developing algorithms that can exploit these resources while minimizing overheads, typically communication costs. This paper describes recent efforts in parallel rendering for polygonal primitives as well as parallel volumetric techniques. It presents rendering algorithms, developed for MPPs, for polygonal, spherical and volumetric data. The polygon algorithm uses a data-parallel approach, whereas the sphere and volume rendering use a MIMD approach. Implementations for these algorithms are presented for a Thinking Machines Corp. CM-5 and a Cray Research Inc. T3D.

关键词： visualization Rendering (computer graphics) Geometry Concurrent computing Laboratories parallel processing graphics Costs Computational modeling Vector processors

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