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IEEE Computer Graphics and Applications

Issue 6 • Nov. 1989

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Displaying Results 1 - 8 of 8
  • A short recipe for seashell synthesis

    Publication Year: 1989, Page(s):8 - 11
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (635 KB)

    Several artistic examples of seashell-like forms produced on a graphics supercomputer are provided. The shapes were created using a simple graphics primitive and rendered using lighting and shading facilities of 3-D extensions to X Windows or the PHIGS+ proposed standard. It is expected that the techniques, equations, and systems will provide useful tools and stimulate future studies in the graphi... View full abstract»

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  • Exploiting coherence for multiprocessor ray tracing

    Publication Year: 1989, Page(s):12 - 26
    Cited by:  Papers (38)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1613 KB)

    The scalability and cost effectiveness of general-purpose distributed-memory multiprocessor systems makes them particularly suitable for ray-tracing applications. However, the limited memory available to each processor in such a system requires schemes to distribute the model database among the processors. The authors identify a form of coherence in the ray-tracing algorithm that can be exploited ... View full abstract»

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  • Procedurally representing lofted surfaces

    Publication Year: 1989, Page(s):27 - 33
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (628 KB)

    The use of tensor-product B-spline surfaces to construct lofted surfaces is discussed. It is shown that several problems must be overcome if tensor-product B-splines are to represent complex lofted surfaces. A method that seems to satisfy all the necessary requirements for parametrically describing such a surface is given. It uses a novel type of surface implemented in a production design system.<... View full abstract»

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  • An efficient three-point arc algorithm

    Publication Year: 1989, Page(s):44 - 49
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (489 KB)

    For many applications a 2-D circular arc can be conveniently specified by three points that lie on the arc. Since the radius of curvature grows without bound as the three points become collinear, any practical algorithm must avoid calculating the arc's radius or functions of the radius. An algorithm that achieves this objective is presented. It is very efficient because it uses exclusively integer... View full abstract»

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  • Robust set operations on polyhedral solids

    Publication Year: 1989, Page(s):50 - 59
    Cited by:  Papers (13)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (959 KB)

    An algorithm for performing regularized Boolean operation on polyhedral solids is described. Robustness is achieved by adding symbolic reasoning as a supplemental step to resolve possible numerical uncertainty. Additionally, numerical redundancy and numerical computation based on derived quantities are reduced as much as possible. Experience with an implementation of the algorithm, using a unit-cu... View full abstract»

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  • Geometric continuity of parametric curves: three equivalent characterizations

    Publication Year: 1989, Page(s):60 - 69
    Cited by:  Papers (30)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (923 KB)

    Some of the important basic results on geometric continuity of curves are presented in a self-contained manner. The paper covers parametric representation and smoothness, parametric continuity, reparameterization and equivalent parameterization, beta-constraints, and arc-length parameterization.<> View full abstract»

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  • Cubic curve update

    Publication Year: 1989, Page(s):70 - 72
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (260 KB)

    The author considers the problem of cataloging all the shapes that can be generated by a cubic equation. In response to a letter commenting on an earlier column, he corrects an error in his listing of all the combinations of factorizations that could make degenerate curves, pointing out that all type 5's are really the same shape and all type 7's are really the same shape. He provides additional c... View full abstract»

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  • The automatic generation of translation software for graphic objects

    Publication Year: 1989, Page(s):34 - 42
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (918 KB)

    The authors discuss their effort to extend their translation architecture for textual, tabular, and mathematical material to include graphic objects. They begin with a brief overview of their testbed, the Chameleon Project. They analyze the feasibility of automatically generating translators in the graphics domain. They use an intermediate-form model for translation and establish criteria for the ... View full abstract»

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Aims & Scope

IEEE CG&A bridges the theory and practice of computer graphics. From specific algorithms to full system implementations, CG&A offers a unique combination of peer-reviewed feature articles and informal departments, including product announcements.

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Meet Our Editors

Editor-in-Chief
L. Miguel Encarnação
University of Iowa