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Computer Graphics and Applications, IEEE

Issue 3 • Date May-June 1998

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Displaying Results 1 - 13 of 13
  • Light Shaping Digital Space

    Page(s): 4 - 5
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  • Getting the Picture

    Page(s): 26 - 27
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  • Projects in VR: the Naval Postgraduate School's Moves curriculum

    Page(s): 8 - 11
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    Both the National Research Council (NRC) report “Virtual Reality: Scientific and Technological Challenges” and the more recent NRC report “Modeling and Simulation: Linking Entertainment and Defense” discuss the need for nontraditional degree programs that focus more closely on the issues of how we develop the software and content for networked virtual environments (VEs). Both reports point out that the more effective VE developer is not just a computer scientist, electrical engineer, or human factors specialist, but rather a scientist who sits in-between, a scientist whose education melds the precise parts required for developing VEs. To produce such graduates requires new degree programs. The Naval Postgraduate School (NPS) has developed one such program, the Modeling, Virtual Environments, and Simulation (Moves) degree program (http://www.moves.nps.navy.mil/). We present the composition of that degree program and its relationship to the research our students can then handle at the end of that program View full abstract»

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  • Optical 3D digitizers: bringing life to the virtual world

    Page(s): 28 - 37
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    The purpose of 3D scanning is to bridge the real world with the virtual world. A practical system would not only produce photorealistic models, but would also be inexpensive and easy to use. We took a 3D scanner developer's viewpoint to review different 3D digitizing techniques. We briefly compare existing systems and give special consideration to active optical triangulation-based scanners View full abstract»

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  • Aperiodic tiling [computer graphics]

    Page(s): 83 - 90
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    One of the most interesting ways of assembling small units is along one of the lattices that make up crystals. In this column I live entirely in a 2D world, so the crystals are nothing but collections of polygons in the plane. It is well known that there are only three regular polygons that can tile the plane. Here the verb tile means to cover the infinite plane with a set of polygons so that no gaps or overlaps exist among the polygons. Each polygon is called a tile and the composite pattern is called a tiling View full abstract»

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  • W pleasure, W fun [3D graphics]

    Page(s): 78 - 82
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    The whole point of doing 3D graphics is the third dimension. Since the screen is only two-dimensional, the third dimension appears only indirectly in terms of perspective and occlusion. Correct occlusion testing is, however, fairly sensitive to precision problems in the depth calculation. I review the traditional way to represent depth and describe a new technique that appears in the new generation of 3D graphics boards. This technique has become practical as a side effect of perspective-correct texture mapping hardware. Both ways have their good and bad points, so I establish some rules of thumb on which method to choose in a given situation View full abstract»

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  • Computer vision for interactive computer graphics

    Page(s): 42 - 53
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    Vision can be a powerful interface device for computers because of its potential for sensing body position, head orientation, direction of gaze, pointing commands, and gestures. Such unencumbered interaction can make computers easier to use. We describe vision algorithms for interactive graphics and present vision-controlled graphics applications using these algorithms. Some applications employ an artificial retina chip for image detection or preprocessing View full abstract»

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  • Engineering a human factor-based geographic user interface

    Page(s): 66 - 77
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    Often applied to spatial data for decision making purposes, GIS is growing rapidly as information technologies find use in new fields. The paper discusses an alternative user interface designed using a formal mathematical model and human factors engineering. It relies on direct manipulation of icons representing spatial and temporal data layers View full abstract»

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  • The times they are a-changing: PC graphics moves in

    Page(s): 20 - 25
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    PCs with substantial 3D graphics are arriving on desktops everywhere. It was only a few years ago that people sniggered at PC graphics and laughed out loud at the notion of PCs with robust and versatile operating systems. Now, however, PC operating systems-especially Windows NT-have software development, networking, multiprocessing, and other tools to rival Unix environments. A user or developer can add a 3D graphics accelerator offering pipelined rendering, full texture mapping, and a complete set of graphics tools with performance that competes with mid-range graphics workstations. And no one is going to beat the price point. On top of all this, it's clear that Intel and Microsoft take this market seriously View full abstract»

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  • A tangible goal for 3D modeling

    Page(s): 62 - 65
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    As we progress into applications that incorporate interactive life-like 3D computer graphics, the mouse falls short as a user interface device, and it becomes obvious that 3D computer graphics could achieve much more with a more intuitive user interface mechanism. Haptic interfaces, or force feedback devices, promise to increase the quality of human-computer interaction by accommodating our sense of touch. The article discusses the application of touch feedback systems to 3D modelling. To achieve a high interactivity level requires novel rendering techniques such as volume-based rendering algorithms View full abstract»

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  • Imaging in medicine-here's looking in you, kid

    Page(s): 12 - 19
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    Over the ages, healers have used imagery of many sorts to understand and explain illness and injury. From the deification of the beings associated with various illnesses to the advent of modern computer-aided imagery, healers have wanted to understand and see what is happening inside of their patients' bodies. I examine the imaging technologies doctors can use now, look at some advances and their applications, and touch on what we can expect the union of computers and imaging technologies to show us in the next few years. Technology such as X-rays, CT scans, PET, MRI and the Medical Imaging Toolkit are considered. Virtual reality medical systems are discussed View full abstract»

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  • Electric field sensing for graphical interfaces

    Page(s): 54 - 60
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    The earliest bit-mapped graphical computers have progressed to bring real-time 3D rendering and digital video to the desktop, but the common physical interface remains unchanged from the first workstations. As a result, many applications, such as modeling or navigating in virtual worlds, are often limited not by processing speed but by the users' difficulty in conveying desired actions to the computer. We outline the theory and implementation of low-frequency electric fields as sensing techniques, then present a range of applications developed for interacting with computer graphics View full abstract»

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  • Autoscan: a flexible and portable 3D scanner

    Page(s): 38 - 41
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    Quantifying physical abnormalities, guiding corrective and plastic surgery, manufacturing clothing, three-dimensional CAD, and other related fields all benefit from the increasing use of 3D scanners. These scanning systems reconstruct a 3D surface as a large set of polygonal meshes. Although Cyberware scanning systems have become a commercial standard, they have two main drawbacks. First, for large objects they require a mechanical structure that cannot be installed or moved easily. Second, they only allow the scanning of objects within limited size ranges. The paper considers a portable 3D scanning system called Autoscan which provides flexibility, reliability and accuracy for scanning 3D surfaces. Autoscan consists of a pair of video cameras, a real-time image processor and a computer host View full abstract»

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Aims & Scope

IEEE Computer Graphics and Applications bridges the theory and practice of computer graphics.

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Meet Our Editors

Editor-in-Chief
L. Miguel Encarnação
University of Iowa