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IEEE Computer Graphics and Applications

Issue 1 • Date Jan. 1992

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Displaying Results 1 - 7 of 7
  • Geometric substitution: a tutorial

    Publication Year: 1992, Page(s):22 - 36
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2558 KB)

    A collection of rewrite rules that transform simple polyhedral models (and polyhedral control meshes) into richer, more visually expressive models is presented. All are based on simple transformations that can be easily implemented and extended. The focus is mostly on techniques of cell replacement, where a unit of the structure (typically a polygon or polyhedron) is replaced by one or more varian... View full abstract»

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  • Computer graphics for holography

    Publication Year: 1992, Page(s):37 - 46
    Cited by:  Papers (2)  |  Patents (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (786 KB)

    Holograms composed from a multiplicity of independent object views, referred to as composite holograms, are discussed. Three techniques, one an extension of old techniques and the others new, are presented. The latter are called the direct method and the postrendering method. The direct approach is favored because it uses less disk space. However, it requires somewhat more care because the element... View full abstract»

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  • A trigonal prism-based method for hair image generation

    Publication Year: 1992, Page(s):47 - 53
    Cited by:  Papers (15)  |  Patents (18)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (958 KB)

    The difficulties involved in modeling and rendering hair in computer graphics are described. An efficient method using a trigonal prism model to render individual human hairs is presented. A wisp model easily controls hair shape with a few parameters. The method also proves effective for rendering eyebrows, eyelashes, beards, moustaches, clothes and personal ornaments such as earrings and hair acc... View full abstract»

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  • Locally manipulating the geometry of curved surfaces

    Publication Year: 1992, Page(s):54 - 64
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1497 KB)

    Interactive tools that can be used to edit a curved surface locally by altering its intrinsic geometric measures are described. The interface consists of two parts. The first uses graphic displays that illustrate specific characteristics of the surface. Users can isolate different types of curves on a surface. These curves yield unique information about the surface. The second part of the interfac... View full abstract»

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  • Distance field manipulation of surface models

    Publication Year: 1992, Page(s):65 - 71
    Cited by:  Papers (40)  |  Patents (45)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (806 KB)

    A surface manipulation technique that uses distance fields-scalar fields derived geometrically from surface models-to combine, modify, and analyze surfaces is presented. It is intended for application to complex models arising in scientific visualization. Computing distance from single triangles is discussed, and an optimized algorithm for computing the distance field from an entire closed surface... View full abstract»

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  • Color scales for image data

    Publication Year: 1992, Page(s):72 - 80
    Cited by:  Papers (44)  |  Patents (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (656 KB)

    Desirable properties of color scales are examined, and a linearized optimal color scale (LOCS) is introduced. The merits of color scales for medical image data were studied, and it was found that, in tests, although observers performed somewhat better with the newly developed LOCS than with the previously advocated heated-object color scale, they performed significantly better with a linearized gr... View full abstract»

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  • A trip down the graphics pipeline: grandpa, what does 'viewport' mean?

    Publication Year: 1992, Page(s):83 - 87
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (292 KB)

    The author describes how he extracted the desirable aspects of window-to-viewpoint transformation while discarding the disquieting ones. He examines the classic window-to-viewport transform, and discusses how it relates to the graphics pipeline he has discussed in the past. He then considers clipping and off-screen viewports.<> 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