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25th Annual Conference on computer graphics and Interactive Techniques, SIGGRAPH 1998

作者： Olano, Marc Lastra, Anselmo University of North Carolina Chapel Hill United States Silicon Graphics Inc. 2011 N. Shoreline Blvd. M/S #590 Mountain View CA 94043 United States UNC Department of Computer Science Sitterson Hall CB #3175 Chapel Hill NC 27599 United States

ISBN: (纸本)0897919998

Over the years, there have been two main branches of computer graphics image-synthesis research;one focused on interactivity, the other on image quality. Procedural shading is a powerful tool, commonly used for creating high-quality images and production animation. A key aspect of most procedural shading is the use of a shading language, which allows a high-level description of the color and shading of each surface. However, shading languages have been beyond the capabilities of the interactive graphics hardware community. We have created a parallel graphics multicomputer, PixelFlow, that can render images at 30 frames per second using a shading language. This is the first system to be able to support a shading language in real-time. In this paper, we describe some of the techniques that make this possible.

关键词： High level languages

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Virtual 3D sculpturing with a parametric hand surface 98

Virtual 3D sculpturing with a parametric hand surface

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computer graphics International

作者： J.P.Y. Wong R.W.H. Lau Lizhuang Ma Computer Graphics and Media Laboratory Department of Computing Hong Kong Polytechnic University Hong Kong China Department of Computer Science City University of Hong Kong Hong Kong China State Key Laboratory of CAD&&G University of Zhejiang Hangzhou China

ISBN: (纸本)9780818684456

Many techniques have been developed for 3D object deformation. These techniques have been widely used in most CAD/CAM systems. Intuitive while efficient methods for interactive 3D object deformation in a VR environment, however, are rare. One of our current research projects is to develop such a technique based on the use of a sensor glove. The idea is to create a hand surface interpolating through all the data points of the sensor glove. Through mapping the vertices of an object model to the hand surface, the object model may be deformed simply by changing the hand gesture. An initial method for implementing this idea was presented in our recent paper. In this paper, we discuss some of the limitations of the earlier method and present a refined method that overcomes most of the limitations. The resulting method is both efficient and intuitive as demonstrated by the results of our experiments.

关键词： Deformable models Lattices Layout Laboratories Virtual reality computer graphics computer science computer aided manufacturing CADCAM Tensile stress

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Design of an optimal test pattern generator for built-in self testing of path delay faults

Design of an optimal test pattern generator for built-in sel...

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International Conference on VLSI Design

作者： D.K. Das I. Chaudhuri B.B. Bhattacharya Department of Computer Science & Engineering. Jadavpur University Calcutta India Mentor Graphics Corporation Hyderabad India Advanced Computing & Microelectronics Unit Indian Statistical Institute Calcutta India

A novel design of a test pattern generator (TPG) for built-in self-testing (BIST) of path delay faults, is proposed. For an n-input CUT, the TPG generates a sequence of length (n.2/sup n/+1), that includes all n.2/sup n/ single-input-change (SIC) test pairs, and hence optimal. The generation of such a sequence of minimum length (i.e., n.2/sup n/+1) was an open problem. A simple iterative circuit of the TPG is then constructed. This provides minimum test application time for testing path delay faults, and compares favorably with the earlier BIST designs.

关键词： Test pattern generators Automatic testing Delay Circuit testing Silicon carbide Circuit faults Built-in self-test Electrical fault detection Fault detection Robustness

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A portable browser for performance programming

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Concurrency and Computation: Practice and Experience 1998年第11期9卷

作者： Michał Cierniak Suresh Srinivas Computer Science Department University of Rochester Rochester NY 14627-0226 USA Silicon Graphics Incorporated 2011 North Shoreline Blvd Mountain View CA 94040 USA

We present jCITE , a performance tuning tool for scientific applications. By combining the static information produced by the compiler with the profile data from real program execution, jCITE can be used to quickly understand the performance bottlenecks. The compiler information allows great understanding of what optimizations have been performed. The user can also find out which optimizations have not been applied and why. Platform independence makes Java the ideal implementation platform for our tool. SGI users can have the same performance analysis tool on all platforms. You can run jCITE on an SGI desktop machine (O2, Octane, Indy) or on a PC running Windows to analyze and optimize the performance of a scientific code running on an SGI Challenge or an SGI Origin machine. In our experiments we were able to significantly speed up some SPEC95 applications in a few days or even a few hours without any prior knowledge of those applications. A longer version of this paper describes all our experiments with jCITE. © 1997 John Wiley & Sons, Ltd.

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Bezier normal vector surface and its applications

Bezier normal vector surface and its applications

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1997 International Conference on Shape Modeling and Applications

作者： Yamaguchi, Y Department of Graphics and Computer Science University of Tokyo Tokyo Japan

ISBN: (纸本)0818678674

One of the essential properties of a surface is its normal vector. Many applications, i.e., surface rendering, surface-surface intersection, and offset surface generation, require normal vectors. A normal vector at a point on a tensor product surface is usually obtained by taking a cross product of the two partial derivatives. This paper discusses a Bezier normal vector surface which is a locus of an unnormalized cross product normal vector. It also explains several applications of the Bezier normal vector surface, such as detection and computation of degenerate normal vectors which cannot be calculated by the cross product, and an algorithm to find all critical points which are key points to solve the problems on surface-surface intersection.

关键词： Equations Polynomials Tensile stress

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A framework for realistic image synthesis 97

A framework for realistic image synthesis

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24th Annual Conference on computer graphics and Interactive Techniques, SIGGRAPH 1997

作者： Greenberg, Donald P. Torrance, Kenneth E. Shirley, Peter Arvo, James Lafortune, Eric Ferwerda, James A. Walter, Bruce Trumbore, Ben Pattanaik, Sumanta Foo, Sing-Choong Program of Computer Graphics Cornell University 580 Frank H.T. Rhodes Hall Ithaca United States Department of Computer Science University of Utah United States Department of Computer Science California Institute of Technology United States Blue Sky Studios Harrison NY United States

ISBN: (纸本)0897918967

Our goal is to develop physically based lighting models and perceptually based rendering procedures for computer graphics that will produce synthetic images that are visually and measurably indistinguishable from real-world images. Fidelity of the physical simulation is of primary concern. Our research framework is subdivided into three sub-sections: the local light reflection model, the energy transport simulation, and the visual display algorithms. The first two subsections are physically based, and the last is perceptually based. We emphasize the comparisons between simulations and actual measurements, the difficulties encountered, and the need to utilize the vast amount of psychophysical research already conducted. Future research directions are enumerated. We hope that results of this research will help establish a more fundamental, scientific approach for future rendering algorithms. This presentation describes a chronology of past research in global illumination and how parts of our new system are currently being developed.

关键词： Light reflection

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Algebraic formalization of temporal structure for multimedia data 4

Algebraic formalization of temporal structure for multimedia...

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4th International Conference on Multi-Media Modeling, MMM 1997

作者： Mizuguchi, Daichi Yamaguchi, Kazunori Department of Graphics and Computer Science College of General Arts and Sciences University of Tokyo 3-8-1 Komaba Meguro-ku Tokyo153 Japan

ISBN: (纸本)9810233515

In this paper, we propose an algebraic model which is useful to describe the temporal structure of time-dependent data, such as multimedia data. We call the temporal structure of such data a history of events. An event is a primitive element of data, composed from an event name and a temporal interval in which the event name is valid. In order to construct a formal model of a history of events, a formal model of time is indispensable. We propose a new model of time which is free from anomalies the existing models have. For the construction, a new concept called semi-point is introduced. Then, we propose a formal model of a history of events called CEE, based on the new model of time. We introduce eleven operations on CEE which serve as the foundation of editing and inquiry of time-dependent data. © Multimedia Modeling, MMM 1997 - Modeling Multimedia Information and Systems. All rights reserved.

关键词： Algebra

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A hybrid web-based toolkit for human modeling

A hybrid web-based toolkit for human modeling

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1997 Scientific Visualization Conference, dagstuhl 1997

作者： Bender, M. Klein, R. Ebert, A. Rodrian, H. Computer Graphics Group Department of Computer Science University of Kaiserslautern Germany Intelligent Visualization and Simulation Systems German Research Center for Artificial Intelligence GmbH Germany Human Modeling Department TECMATH GmbH and Co. KG Kaiserslautern Germany

ISBN: (纸本)0769505031

Modern web-based Scientific Visualization applications try to overcome common limitations imposed by limited internet bandwidth, server bottlenecks or network latency. A further aspect is the desire to gain platform independence by solely using instruments which are platform independent by conception: the programming language Java, the Virtual Reality Modeling Language (VRML), or the 3D API *** present a prototype of a hybrid web-based Scientific Visualization system which makes use of the increasing computational power of modern desktop workstations and personal computers on the client side, and the superior performance provided by a powerful machine on the server side. In order to achieve high interaction rates and to balance computational load the user can dynamically assign selected tasks to his client or to the *** the scientific field of human modeling we have implemented a hybrid web-based toolkit for the modeling of human muscles and skin. Our application allows the on-line generation and manipulation of three-dimensional implicit muscle models in a heterogeneous network and it offers various parameters to adjust computation and response time versus rendering quality. © 1997 IEEE computer Society.

关键词： Heterogeneous networks

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Maintaining the extent of a moving point set 5th

Maintaining the extent of a moving point set

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5th International Workshop on Algorithms and Data Structures, WADS 1997

作者： Agarwal, Pankaj K. Guibas, Leonidas J. Hershberger, John Veach, Eric Department of Computer Science Duke University DurhamNC27708 United States Computer Science Department Stanford University StanfordCA94305 United States Mentor Graphics Corp. 1001 Ridder Park Drive San JoseCA95131 United States

ISBN: (纸本)3540633073

Let S be a set of n moving points in the plane. We give new efficient and compact kinetic data structures for maintaining the diameter, width, and smallest area or perimeter bounding rectangle of the points. When the points in S move with pseudo-algebraic motions, these structures process O(n2+Ε) events. We also give constructions showing that Ω(n2) combinatorial changes are possible in these extent functions even when the points move on straight lines with constant velocities. We give a similar construction and upper bound for the convex hull, improving known results. © Springer-Verlag Berlin Heidelberg 1997.

关键词： computers

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Mechanizing verification of arithmetic circuits: SRT division 17th

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17th Conference on Foundations of Software Technology and Theoretical computer science, FSTTCS 1997

作者： Kapur, Deepak Subramaniam, M. Computer Science Department State University of New York AlbanyNY12222 United States Functional Verification Group Silicon Graphics Inc. Mountain ViewCA94040 United States

ISBN: (纸本)3540638768

The use of a rewrite-based theorem prover for verifying properties of arithmetic circuits is discussed. A prover such as Rewrite Rule Laboratory (RRL) can be used effectively for establishing numbertheoretic properties of adders, multipliers and dividers. Since verification of adders and multipliers has been discussed elsewhere in earlier papers, the focus in this paper is on a divider circuit. An SRT division circuit similar to the one used in the Intel Pentium processor is mechanically verified using RRL. The number-theoretic correctness of the division circuit is established from its equational specification. The proof is generated automatically, and follows easily using the inference procedures for contextual rewriting and a decision procedure for the quantifier-free theory of numbers (Presburger arithmetic) already implemented in RRL. Additional enhancements to rewrite-based provers such as RRL that would further facilitate verifying properties of circuits with structure similar to that of the SRT division circuit are discussed. © 1997, Springer Verlag.

关键词： Adders

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