IEEE Computer Graphics and Applications

Issue 2 • March 1988

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Displaying Results 1 - 7 of 7
  • The world's largest easter egg and what came out of it

    Publication Year: 1988, Page(s):16 - 23
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (715 KB)

    The use of an interesting triangulation scheme to design a monumental sculpture of an easter egg is described. The triangulation method used to approximate the egg's surface is based on paper folding. The development of the program and its generalization to three dimensions are examined. The calculation of the three parts of the egg (a middle-barrel section and the two end caps) and some unsolved ... View full abstract»

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  • A PHIGS-based graphics input interface for spatial-mechanism design

    Publication Year: 1988, Page(s):26 - 38
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (909 KB)

    A graphics preprocessor that interactively assists in the definition of spatial-mechanism problems is described. Methods of depth cueing and six-degree-of-freedom data entry are presented. To achieve graphics device independence, the proposed graphics standard PHIGS (Programmer's Hierarchical Interactive Graphics System) has been used. Examples of applications include generation of input commands ... View full abstract»

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  • Mechanism synthesis using the workstation environment

    Publication Year: 1988, Page(s):39 - 50
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1819 KB)

    Some capabilities of modern engineering workstations and their impact on the mechanism synthesis process are discussed. Specific examples of ongoing work at the University of Minnesota utilizing the Apollo color raster workstation to provide user-friendly general-purpose user-interface tools are presented. The application of these tools to the LINCAGES-4 four-bar linkage synthesis and analysis pro... View full abstract»

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  • Representing dimensions, tolerances, and features in MCAE systems

    Publication Year: 1988, Page(s):51 - 59
    Cited by:  Papers (89)  |  Patents (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (660 KB)

    A method is presented for explicitly representing dimensions, tolerances, and geometric features in solid models. The method combines CSG and boundary representations in a graph structure called an object graph. Dimensions are represented by a relative position operator. The method can automatically translate changes in dimensional values into corresponding changes in geometry and topology. The re... View full abstract»

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  • Spacetime ray tracing for animation

    Publication Year: 1988, Page(s):60 - 70
    Cited by:  Papers (34)  |  Patents (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1084 KB)

    Techniques for the efficient ray tracing of animated scenes are presented. They are based on two central concepts: spacetime ray tracing, and a hybrid adaptive space subdivision/boundary volume technique for generating efficient, nonoverlapping hierarchies of bounding volumes. In spacetime ray tracing, static objects are rendered in 4-D space-time using 4-D analogs to 3-D techniques. The bounding ... View full abstract»

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  • FIDS-A flat-panel interactive display system

    Publication Year: 1988, Page(s):71 - 82
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (993 KB)

    The design of a prototype flat-panel interactive display system (FIDS) based on state-of-the-art human-computer-interaction techniques is described. An example application, namely, a text editor using the standard proof correction marks drawn directly on the display, is presented. Software design and implementation are discussed. The use of the keystroke-level mode to evaluate the prototype is con... View full abstract»

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  • A tracking algorithm for implicitly defined curves

    Publication Year: 1988, Page(s):83 - 89
    Cited by:  Papers (16)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (491 KB)

    A tracking algorithm is given for curves that have equations of the form f(x,y)=0. It produces the next approximating pixel by looking for a sign difference in function evaluations at midpoints between the eight nearest neighboring pixels. The search proceeds in order of decreasing likelihood, examining the most probable candidates first.<> 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
The QED Group