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computer graphics International

作者： Young-Min Kang Jeong-Hyeon Choi Hwan-Gue Cho Chan-Jong Park Graphics Application Lab Department of Computer Science Pusan National University South Korea Virtual Reality Center Electronics and Telecommunication Research Institute

Realistic animation of soft objects such as cloth is essential for plausible character animation. Many techniques have been proposed for the simulation of soft objects, and most of them are based on numerical integration. Among the techniques, the implicit integration method is the most likely technique for real time environments, since it allows large time steps for cloth simulation by ensuring the stability of systems. However the most critical flaw of the implicit method is that it involves a large linear system. The paper presents a fast animation technique for animating soft objects based on a mass-spring model with an approximated implicit method which does not involve linear system solving. The proposed technique stably updates the state of n mass-points in O(n) time when the number of total springs are O(n). Because the mass-spring model shows a superelastic effect, the excessively deformed springs (i.e., super-elongated springs) should be adjusted for reality. The paper presents an efficient inverse dynamics process to adjust the super-elongated springs.

关键词： Animation Springs Computational modeling Linear systems Stability Deformable models Electrical capacitance tomography Image generation computer graphics Application software

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Fast post-placement rewiring using easily detectable functional symmetries

Fast post-placement rewiring using easily detectable functio...

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Design Automation Conference

作者： Chih-Wei Chang Chung-Kuan Cheng P. Suaris M. Marek-Sadowska Department of Electrical and Computer Engineering University of California슠Santa Barbara Santa Barbara CA USA Department of Computer Science and Engineering University of California La Jolla CA USA Mentor Graphics Corporation Wilsonville OR USA

ISBN: (纸本)1581131897

Timing convergence problem arises when the estimations made during logic synthesis can not be met during physical design. In this paper, an efficient rewiring engine is proposed to explore maximal freedom after placement. The most important feature of this approach is that the existing placement solution is left intact throughout the optimization. A linear time algorithm is proposed to detect functional symmetries in the Boolean network and is used as the basis for rewiring. Integration with an existing gate sizing algorithm further proves the effectiveness of our technique. Experimental results are very promising.

关键词： Logic Design engineering Timing Integrated circuit interconnections Circuit synthesis Network synthesis Convergence Wires Permission Connectors

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AlVis - An aluminium-foam visualization and investigation tool

AlVis - An aluminium-foam visualization and investigation to...

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2nd Joint Eurographics - IEEE TCVG Symposium on Visualization, VisSym 2000

作者： König, Andreas H. Doleisch, Helmut Kottar, Andreas Kriszt, Brigitte Gröller, Eduard Institute of Computer Graphics Vienna University of Technology Karlsplatz 13 ViennaA-1040 Austria Institute of Experimental Physics Vienna University of Technology Karlsplatz 13 ViennaA-1040 Austria Department of Material Science and Testing Vienna University of Technology Karlsplatz 13 ViennaA-1040 Austria

ISBN: (纸本)3211835156

In recent years there has been an increased interest in metal foams in the field of material science. The stress absorbing potential is one of the most interesting properties for the application of aluminium foam (e.g. car manufacturing). Material scientists need to investigate the structure of metal foams in order to optimize their deformation behavior. An interactive tool for the investigation is presented in this work. Real-time surface rendering, automatic parameter determination, and display of local and global foam properties enable the user to understand the complex structure of the metal foam. © 2000 Eurographics Association. All rights reserved.

关键词： Aluminum

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Provably good global buffering using an available buffer block plan

Provably good global buffering using an available buffer blo...

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IEEE International Conference on computer-Aided Design

作者： F.F. Dragan A.B. Kahng I. Mandoiu S. Muddu A. Zelikovsky Department of Computer Science University of California Los Angeles Los Angeles CA USA College of Computing Georgia Institute of Technology Atlanta GA USA Silicon Graphics Inc. Mountain View CA USA Department of Computer Science Georgia State University Atlanta GA USA

To implement high-performance global interconnect without impacting the performance of existing blocks, the use of buffer blocks is increasingly popular in structured-custom and block-based ASIC/SOC methodologies. Recent works by Cong et al. (1999) and Tang and Wong (2000) give algorithms to solve the buffer block planning problem. In this paper we address the problem of how to perform buffering of global nets given an existing buffer block plan. Assuming that global nets have been already decomposed into two-pin connections, we give a provably good algorithm based on a recent approach of Garg and Konemann (1998) and Fleischer (1999). Our method routes connections using available buffer blocks, such that required upper and lower bounds on buffer intervals-as well as wirelength upper bounds per connection-are satisfied. Our model allows more than one buffer to be inserted into any given connection. In addition, our algorithm observes buffer parity constraints, i.e., it will choose to use an inverter or a buffer (=co-located pair of inverters) according to source and destination signal parity. The algorithm outperforms previous approaches and has been validated on top-level layouts extracted from a recent high-end microprocessor design.

关键词： Repeaters Inverters computer science Integrated circuit interconnections Silicon Frequency estimation Delay estimation High performance computing computer graphics Application specific integrated circuits

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Intuitive virtual grasping for non haptic environments

Intuitive virtual grasping for non haptic environments

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Pacific Conference on computer graphics and Applications

作者： T. Ullmann J. Sauer Department of Computer Science and Automation Computer Graphics Program Technical University Ilmenau Ilmenau Germany Commercial Vehicle Development DaimlerChrysler Aerospace Sindelfingen Germany Virtual Reality Competence Center Daimler Chrysler Research and Technology Center Ulm Germany

This paper presents an approach for grasping virtual objects in virtual environments with a data glove. Our focus lies on developing new methods that allow sensible realistic grasping gestures which correspond to human grasping behavior. To meet the demands of industrial applications, users must be able to grasp an object in an intuitive way with one or two hands and, beyond that, manipulate grasped objects between their fingers. To avoid the use of expensive force or touch feedback hardware, but also to ensure a safe grip on virtual objects, several forms of visual feedback are provided. First, we describe the basic algorithm for grasping with one or two hands and finally, we present a method to precisely manipulate the grasped objects between the virtual fingers.

关键词： Grasping Haptic interfaces Data gloves Virtual reality Virtual environment Fingers Force feedback Hardware Application software Engines

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On switch factor based analysis of coupled RC interconnects

On switch factor based analysis of coupled RC interconnects

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Design Automation Conference

作者： A.B. Kahng S. Muddu E. Sarto Silicon Graphics Inc. Mountain View CA USA UCLA Computer Science Department Los Angeles CA USA 3dfx Interactive Inc. San Jose CA USA

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Evaluating synchronization on shared address space multiprocessors: Methodology and performance

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Performance Evaluation Review 1999年第1期27卷 23-34页

作者： Kumar, Sanjeev Jiang, Dongming Chandra, Rohit Singh, Jaswinder Pal Department of Computer Science Princeton University Silicon Graphics Inc.

Synchronization is an area that exhibits rich hardware-software interactions in multiprocessors. It was studied extensively using microbenchmarks a decade ago. However, its performance implications are not well understood on modern systems or on real applications. We study the impact of synchronization primitives and algorithms on a modern, 64-processor, hardware-coherent shared address space multiprocessor: the SGI Origin 2000. In addition to the actual results on a modern system, we examine the key methodological issues in studying synchronization, for both microbenchmarks and applications. We find that although the efficient hardware support (Fetch&Op) for synchronization provided on our machine usually helps lock and barrier microbenchmarks, it does not help in improving application performance when compared to good software algorithms that use the processor-provided LL-SC instructions. This is true even in applications that spend a significant amount of time in synchronization operations. More elaborate hardware support is unlikely to have a significant benefit either. From the applications' perspective, it is usually the waiting time due to load imbalance or serialization that dominates synchronization time, not the overhead of the synchronization operations themselves, even in apparently balanced cases where the overhead may be expected to be substantial.

关键词： Multiprocessing systems Algorithms computer software computer systems programming Response time (computer systems) Synchronization Shared address space multiprocessors

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A client-side approach towards platform independent molecular visualization over the world wide web

A client-side approach towards platform independent molecula...

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1st Joint Eurographics - IEEE TCVG Symposium on Visualization, VisSym 1999

作者： Bender, Michael Hagen, Hans Seck, Axel Computer Graphics Group Department of Computer Science University of Kaiserslautern Germany

ISBN: (纸本)9783709168035

A web-based, entirely platform independent Molecular Visualization System has been developed using state of the art Internet programming techniques. This system offers the visualization of various molecular models, molecular surfaces and molecular properties which can be displayed at the same time. The system itself has been developed using the Java programming language, which allows flexible and platform independent use, perfect integration with the World Wide Web and due to its object-oriented structure easy extension and maintenance. All necessary calculations, e.g. the calculation of a Richards' Contact Surface or an Isosurface, take place on the client's side exploiting the computational power of modern desktop workstations and personal computers. © 1999 Eurographics Association. All rights reserved.

关键词： Visualization

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Texture Shaders

Texture Shaders

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1999 ACM SIGGRAPH/EUROgraphics Workshop on graphics Hardware, EGGH 1999

作者： McCool, Michael D. Heidrich, Wolfgang Computer Graphics Lab Department of Computer Science University of Waterloo WaterlooONN2L3G1 Canada Computer Graphics Group Max Planck Institute for Computer Science Im Stadtwald Saarbriicken 66123 Germany

ISBN: (纸本)1581131704

Extensions to the texture-mapping support of the abstract graphics hardware pipeline and the OpenGL API are proposed to better support programmable shading, with a unified interface, on a variety of future graphics accelerator architectures. Our main proposals include better support for texture map coordinate generation and an abstract, programmable model for multitexturing. As motivation, we survey several interactive rendering algorithms that target important visual phenomena. With hardware implementation of programmable multitexturing support, implementations of these effects that currently take multiple passes can be rendered in one pass. The generality of our proposed extensions enable efficient implementation of a wide range of other interactive rendering algorithms. The intermediate level of abstraction of our API proposal enables high-level shader metaprogramming toolkits and relatively straightforward implementations, while hiding the details of multitexturing support that are currently fragmenting OpenGL into incompatible dialects. © ACM 1999

关键词： Application programming interfaces (API)

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Accessibility analysis for planning of dimensional inspection with coordinate measuring machines (vol 15, pg 714, 1999)

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IEEE TRANSACTIONS ON ROBOTICS AND AUTOMATION 1999年第6期15卷 1146-1146页

作者： Spitz, SN Spyridi, AJ Requicha, AAG Programmable Automation Laboratory Computer Science Department University of Southern California Los Angeles CA USA Advanced Graphics Division SGI Mountain View CA USA

computer-controlled dimensional inspection is typically performed with coordinate measuring machines (CMMs), which are very precise Cartesian robots that use touch probes to measure the coordinates of points on a workpiece's surfaces. Automatic planning and programming of inspection tasks with a CMM involve spatial reasoning, to determine how to orient the part on the CMM, which probes to use, how to orient the probes, and so on. This paper introduces the notions of accessibility and approachability, which are important for inspection planning, and describes two sets of implemented algorithms for computing accessibility information. One of these sets of algorithms performs exact computations on polyhedral objects and is relatively slow, whereas the other uses discrete approximations and achieves high speed by exploiting standard computer graphics hardware. The discretized algorithm has been tested on real-world parts, and is sufficiently fast for industrial applications.

关键词： Inspection Coordinate measuring machines Probes Performance evaluation Robot kinematics Robotics and automation Automatic programming Robot programming High performance computing computer graphics

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