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IEEE Computer Graphics and Applications

Issue 6 • Date Nov 1995

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Displaying Results 1 - 13 of 13
  • Voxel-based modeling for layered manufacturing

    Publication Year: 1995, Page(s):42 - 47
    Cited by:  Papers (42)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (468 KB)

    Layered manufacturing (LM) technologies have revolutionized the prototyping of complex geometric designs, but still employ traditional CAD tools. A voxel-based approach is under development in a modeling tool called G-WoRP (Geometric Workbench for Rapid Prototyping), which is tuned toward fabrication with LM equipment. The user interacts with the workbench through an input layer that provides two ... View full abstract»

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  • Molecules at your fingertips

    Publication Year: 1995, Page(s):14 - 16
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (296 KB)

    Chemists learn about chemical and biological reactions by studying the interactions between molecular structures. A molecule's shape and its fit with other structures offer clues to its purpose and suggest ways it can be modified to create new reactions. Molecular modeling software lets chemical engineers view 3D models of these structures on screen. But it still can be difficult to grasp the shap... View full abstract»

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  • Tools for rapid prototyping in the biosciences

    Publication Year: 1995, Page(s):48 - 55
    Cited by:  Papers (12)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (680 KB)

    Modeling natural objects like human skeletons is essentially reverse engineering from medical imaging data. We report on the design and implementation of such tools for computer-assisted rapid prototyping applications. Two application case studies show how graphics tools exploit the potential of stereolithography in the biosciences, demonstrating the role of stereolithographic models (a) in recons... View full abstract»

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  • Visualizing gradients in composite design and fabrication

    Publication Year: 1995, Page(s):10 - 13
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (428 KB)

    Greater access to computer resources has prompted scientists, engineers, and designers in all disciplines to go beyond the “number crunching” paradigm and establish visual tools and methodologies that are discipline-independent. The tools most commonly used in mechanics and material science are visualizations of gradients in scalar properties (zeroth-order tensors) and various stress g... View full abstract»

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  • A new space subdivision for ray tracing CSG solids

    Publication Year: 1995, Page(s):56 - 62
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (564 KB)

    Ray tracing successfully creates realistic images of constructive solid geometry (CSG) solids. We describe a nonuniform space subdivision scheme that reduces both the number of ray-object intersection computations and point classifications. Our method uses the face planes of the primitives' S-bounds in a bottom-up fashion and produces a subdivision wherein the localized CSG tree in each leaf voxel... View full abstract»

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  • Tele-Manufacturing: rapid prototyping on the Internet

    Publication Year: 1995, Page(s):20 - 26
    Cited by:  Papers (24)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (508 KB)

    Discusses how a research and development project called the Tele-Manufacturing Facility is creating an automated rapid prototyping capability on the Internet. We are doing the necessary research and development to make the capability viable for engineers and scientists to use over long distances. Our view of the engineering concept design-production process is given. This model clearly shows the i... View full abstract»

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  • GKS-94: an overview

    Publication Year: 1995, Page(s):64 - 71
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (680 KB)

    A revision of the Graphical Kernel System (GKS), the first ISO standard for computer graphics programming, was completed in 1994. This summary of GKS-94 also describes an implementation of part of its new functionality. We have demonstrated that fast selection is possible with GKS-94. Thus, an application can use namesets and selection criteria as its main method of subdivision, selection and crea... View full abstract»

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  • Generating topological structures for surface models

    Publication Year: 1995, Page(s):35 - 41
    Cited by:  Papers (21)  |  Patents (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (548 KB)

    Rapid prototyping has imposed new requirements on the processing of CAD models. To manufacture an object directly, the model must correspond to a real object and thus represent a closed volume. Its boundary must be continuous and closed, and no cracks or improper intersections are allowed. CAD models cannot always meet these requirements, especially when they are constructed by a surface modeler. ... View full abstract»

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  • Three wrongs make a right

    Publication Year: 1995, Page(s):90 - 93
    Cited by:  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (264 KB)

    When dealing with graphics operations that must be fast (like the inner loops of rendering algorithms), I usually like to do calculations with fixed-point arithmetic (that is, scaled integers) rather than floating point arithmetic. The exact scaling factor used can have some interesting effects on the speed and errors in the calculation. In this article, I'll give some titbits I've discovered or p... View full abstract»

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  • Training the officer of the deck

    Publication Year: 1995, Page(s):6 - 9
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (372 KB)

    The need to train people for increasingly complex tasks given diminishing budgets makes simulation-based training attractive in both the commercial and military sectors. Training systems that use virtual environment (VE) technology are potentially both reconfigurable and portable. The same equipment could provide a wide range of simulations at or near the trainees' worksite, letting them train clo... View full abstract»

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  • Removing zero-volume parts from CAD models for layered manufacturing

    Publication Year: 1995, Page(s):27 - 34
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (736 KB)

    CAD models for automated manufacturing should describe solids as mathematically regularized sets. The technique presented clears STL files of zero-volume parts that violate the definition of a regularized set View full abstract»

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  • Perceptually tuned generation of grayscale fonts

    Publication Year: 1995, Page(s):78 - 89
    Cited by:  Papers (5)  |  Patents (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (872 KB)

    A new approach to grayscale font generation improves on the fuzzy characters produced by existing methods by incorporating the expertise of type designers into rules for character-outline weight and phase control. The method we propose for synthesizing high-contrast grayscale characters relies on the set of visual rules that type designers have derived from their many years of manual design. We ca... View full abstract»

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  • Visualization techniques for molecular dynamics

    Publication Year: 1995, Page(s):72 - 77
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (436 KB)

    Electron and X-ray diffractometry visualize atoms in severely stressed single-crystal silicon and help analyze the resulting phase transformations. Massively parallel computers simulate both diffraction techniques. We study these phase transitions with a number of simulation techniques. We calculate the position of the atoms in the material during the process and display atomic images of the cryst... 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