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Computer Graphics and Applications, IEEE

Issue 3 • Date May 1993

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Displaying Results 1 - 9 of 9
  • Global change video: visualization freeze-frames

    Publication Year: 1993 , Page(s): 11 - 13
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    Freely Available from IEEE
  • White laser, synced scan (3D scanner)

    Publication Year: 1993 , Page(s): 15 - 17
    Cited by:  Patents (4)
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    Freely Available from IEEE
  • Desktop animation of multiple human figures

    Publication Year: 1993 , Page(s): 18 - 26
    Cited by:  Papers (2)  |  Patents (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (812 KB)  

    Life Forms, a desktop system specifically designed to develop a full-motion specification for multiple human figures is described. The Life Forms application complements a general-purpose animation system with full modeling, rendering, and composition capabilities. The system supports this process from concept development through detailed choreography and composition to visualization of the final result. Normally, Life Forms' output serves as input to a general-purpose animation system, where an environment is added, body models may be elaborated, and rendering of final images occurs. The enhanced images are then transferred to videotape or film and go on to postproduction. Several concepts of human figure animation are reviewed in discussing Life Forms.<> View full abstract»

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  • Exploring 3D computer graphics in cockpit avionics

    Publication Year: 1993 , Page(s): 28 - 35
    Cited by:  Papers (6)  |  Patents (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (524 KB)  

    A system that uses 3-D computer graphics to integrate and visualize flight information and to encode navigational information of the objects of a 3-D scene is described. The computer-generated views of geographic features, weather information, and air traffic used in the system are discussed. The system's support of instrument approach technology is also discussed. A number of design notions that have come out of this work, are reviewed.<> View full abstract»

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  • Delaunay triangulation using a uniform grid

    Publication Year: 1993 , Page(s): 36 - 47
    Cited by:  Papers (7)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (892 KB)  

    An algorithm for triangulating 2-D data points that is based on a uniform grid structure and a triangulation strategy that builds triangles in a circular fashion is discussed. The triangulation strategy lets the algorithm eliminate points from the internal data structure and decreases the time used to find points to form triangles, given an edge. The algorithm has a tested linear time complexity that significantly improves on that of other methods. As a by-product, the algorithm produces the convex hull of the data set at no extra cost. Two ways to compute the convex hull using the algorithm are presented. The first is based on the edge list and the second is based on the grid structure.<> View full abstract»

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  • The scaling behavior of viewing transformations

    Publication Year: 1993 , Page(s): 48 - 54
    Cited by:  Papers (1)  |  Patents (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (544 KB)  

    Using formal analysis of parallel and perspective viewing transformation behavior, closed-form form expressions are obtained for immediate evaluation of maximum, minimum, and average scales at a given point in space. While these are constant for parallel transformations, they vary from point to point for perspective transformations. The average scale of a transformation is expressed in ways useful for heuristic computations. The expressions indicate how transformations perform in general without providing guarantees. It is shown that these results apply to the dynamic tessellation of curved surfaces. The maximum scale of a transformation across a bounded region can guarantee that one will meet postviewing approximation thresholds specified in display coordinates, based on derivative bounds precomputed in modeling coordinates.<> View full abstract»

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  • Hierarchical schemes for curve representation

    Publication Year: 1993 , Page(s): 55 - 63
    Cited by:  Papers (2)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (910 KB)  

    The performance of three curve representation schemes are compared. They are the strip-tree, Bezier-curve-employing, and arc-tree methods. Each scheme represents a curved shape as a hierarchy of approximations, where higher levels in the hierarchy correspond to coarser approximations of the curve. In addition, each approximation typically corresponds to a bounding area that encloses the actual curve. When geometric operations are computed, coarse approximation of the curve are initially addressed and finer approximation levels are processed if necessary. It is shown that the three representations differ in the choice of bounding areas, the type and amount of information stored at each approximation level, and the method of deciding whether to proceed to finer approximations.<> View full abstract»

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  • Variational solid modeling for tolerance analysis

    Publication Year: 1993 , Page(s): 64 - 74
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1021 KB)  

    A variational model is a computer representation of a variational class and stands for a collection of different instances of the part or assembly modeled in CAD. The different basic approaches to variational modeling are reviewed. A surface-based approach to variational modeling is discussed. The approach is applied to solving the problems of eliminating rigid-body motion, handling incidence and tangency constraints, and modeling form variations. The application of variational modeling to automated tolerance analysis is also discussed.<> View full abstract»

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  • A trip down the graphics pipeline: the homogeneous perspective transform

    Publication Year: 1993 , Page(s): 75 - 80
    Cited by:  Papers (2)  |  Patents (10)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (470 KB)  

    The perspective transformation, which basically turns space inside out, is discussed. Some interesting topological properties of the space represented by homogeneous coordinates are reviewed. It is shown that the perspective transform has practical applications in selecting near and far clipping planes to avoid depth resolution problems encountered with many types of rendering algorithms.<> View full abstract»

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

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L. Miguel Encarnação
University of Iowa