IEEE Computer Graphics and Applications

Issue 3 • May 1989

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Displaying Results 1 - 9 of 9
  • Computer animation for visualizing terrain data

    Publication Year: 1989, Page(s):12 - 13
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (419 KB)

    Until recently, the study of terrain data gathered by satellites has meant the time-consuming analysis of hundreds of still images. An attempt to use computer animation to analyze such images more effectively is described. A simulated fly-by created by computer animation allows scientists to study many different perspective views of the data quickly. Using this technique, scientists can often dete... View full abstract»

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  • Visualizing oceanographic data

    Publication Year: 1989, Page(s):14 - 19
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (521 KB)

    The use of visualization to study both field-collected and simulated oceanographic data is discussed. An overview is presented of three programs in which visualization has provided important insight or technology. The diverse technology used-animation, computer vision, and synthesis of signal processing, image processing, and display-illustrate the variety of methodologies that are increasing know... View full abstract»

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  • Near real-time CSG rendering using tree normalization and geometric pruning

    Publication Year: 1989, Page(s):20 - 28
    Cited by:  Papers (30)  |  Patents (6)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (734 KB)

    A description is given of a set of algorithms for efficiently rendering an object defined by constructive solid geometry (CSG) directly onto a frame buffer without converting first to a boundary representation. This method requires only that the frame buffer contain sufficient memory to hold two color values, two depth values, and three one-bit flags. The algorithm first converts the CSG tree to a... View full abstract»

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  • A set of benchmarks for evaluating engineering workstations

    Publication Year: 1989, Page(s):29 - 33
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (424 KB)

    The design of a set of benchmarks for evaluating the capabilities of high-performance engineering workstations is described. The benchmarks were designed to evaluate the workstations' capacity to calculate and display solid finite-element or finite-difference data. After the benchmarks were run on several workstations, a cost performance analysis was undertaken. This analysis was based on how many... View full abstract»

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  • The interactive editing and contouring of empirical fields

    Publication Year: 1989, Page(s):34 - 43
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1132 KB)

    A system for the interactive editing and contouring of surfaces derived from empirical fields is described. The approach taken begins with the representation of a field as a general-order, nonuniform, tensor-product, B-spline surface. It provides an interactive display for editing the surface by control-vertex manipulation and a contouring algorithm that is specifically designed for the fast and r... View full abstract»

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  • A tension-compatible patch for shape-preserving surface interpolation

    Publication Year: 1989, Page(s):45 - 55
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (736 KB)

    Several issues and techniques related to the problem of constructing shape-preserving interpolants for discrete gridded data are discussed. For choosing slopes and twists it is shown that the method of parabolic blending is intuitively appealing and easy to implement, and that it produces results consistent with standard notions of implied shape. It is shown by examples that standard bicubic patch... View full abstract»

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  • Double-step generation of ellipses

    Publication Year: 1989, Page(s):56 - 69
    Cited by:  Papers (7)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1024 KB)

    The principle of double-step incremental generation of nonparametric curves on a discrete plane is used to develop a double-step algorithm for scan converting ellipses in sixteen separate segments. The algorithm iterates only half as many times as current algorithms, while each iteration demands the same number of operations or slightly fewer operations than M. Pitteway's (1967, 1985) algorithm (p... View full abstract»

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  • The map geometric transformation

    Publication Year: 1989, Page(s):70 - 75
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (472 KB)

    A geometric transformation useful for the positioning, orientation, and shape alteration of graphical objects is introduced. The form of its invocation in the language for interactive graphics (LIG) is described. The approach can easily specify complex transformations and functions effectively in combinations. Sample applications showing two styles of use and a description of the mathematics used ... View full abstract»

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  • Jim Blinn's corner-how many different cubic curves are there?

    Publication Year: 1989, Page(s):78 - 83
    Cited by:  Patents (8)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (415 KB)

    The author examines the meaning of the title question, noting that geometry can be described as the study of those properties of a shape that remain unchanged even if it is subjected to some transformation. He deals here with 2-D homogeneous coordinates, so the transformation is the standard homogeneous projective transformation representable by a 3*3 matrix. Any two shapes that can transform into... View full abstract»

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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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Editor-in-Chief
L. Miguel Encarnação
The QED Group