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IEEE Computer Graphics and Applications

Issue 5 • Date Sept. 1989

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Displaying Results 1 - 7 of 7
  • Optimal tubes [spacecraft modelling]

    Publication Year: 1989, Page(s):8 - 13
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (372 KB)

    A technique devised to cut down the number of polygons required to model and render the Voyager spacecraft is presented. It requires the solution of a simple geometric problem: find the tangent lines from a point to a circle. He describes two ways of solving this problem, one using conventional analytical geometry and the other using homogeneous coordinates. The latter provides some useful general... View full abstract»

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  • Computer graphics for cellular reconstruction

    Publication Year: 1989, Page(s):16 - 23
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (750 KB)

    The use of computer graphics to study the three-dimensional structure of tissues within an organism such as a human is considered. A system called Sterecon, which uses stereo views of thick sections of tissues and a high-voltage electron microscope, is described. Contours of structures are traced in stereo and entered into a graphics database. Using thick sections decreases the work by ten- to twe... View full abstract»

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  • An object-oriented approach to the solid modeling of empirical data

    Publication Year: 1989, Page(s):24 - 35
    Cited by:  Papers (1)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (998 KB)

    An object-oriented approach to the construction, manipulation, and display of complex geometric models of oil reservoirs is described. The authors have extended the traditional constructive solid geometry modeling techniques to accommodate the requirements for reservoir models. Both the user interface and the model building are implemented in Strobe, an object-oriented extension to Interlisp. The ... View full abstract»

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  • Cartographic name placement with Prolog

    Publication Year: 1989, Page(s):36 - 47
    Cited by:  Papers (1)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (972 KB)

    A major problem in computer cartography is how to place names on maps so they are clearly associated with the features they annotate, while avoiding overlap with other names and features. The logic programming language, Prolog, can be used to express the name-placement problem as a set of rules, referring primarily to the identification of free space, the generation of trial label positions, and t... View full abstract»

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  • A menagerie of rational B-spline circles

    Publication Year: 1989, Page(s):48 - 56
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (519 KB)

    The article was motivated by J. Blinn's column on the many ways to draw a circle (see ibid., vol.7, no.8, p.39-44, 1987). The authors have found several other ways to represent the circle as a nonuniform rational B-spline curve, which they present. Square-based methods, infinite control points, triangle-based methods, general circular arcs and rational cubic circles are some of the methods and typ... View full abstract»

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  • Geometric data transfer between CAD systems: solid models

    Publication Year: 1989, Page(s):57 - 71
    Cited by:  Papers (1)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1312 KB)

    The first phase of the ESPRIT project CAD*I resulted in a specification for the exchange of solid models as well as in some pilot implementations of processors based on this specification. The authors summarize the CAD*I approach, addressing the structure of neutral files for solids, entities, and attributes supporting three kinds of representations: facilities for the transfer of parametric desig... View full abstract»

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  • Architectural issues in solid modelers

    Publication Year: 1989, Page(s):72 - 87
    Cited by:  Papers (2)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1310 KB)

    Several issues related to solid modeling are examined. Fundamental background definitions and concepts are presented, concentrating especially on dual-representation solid-modeling environments. An ideal architecture is hypothesized and it is shown that the current state of the art leads to one of two compromise architectures in practice. Also studied are lower level development strategies, includ... 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