Journal of Graphic Science of Japan
Online ISSN : 1884-6106
Print ISSN : 0387-5512
ISSN-L : 0387-5512
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Volume 21, Issue 2
Displaying 1-6 of 6 articles from this issue
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  • Application of Gauss Image to Engineering Classification and Evaluation of Curved Surfaces
    Tatsuhiko AIZAWA
    1987 Volume 21 Issue 2 Pages 3-9
    Published: 1987
    Released on J-STAGE: August 25, 2010
    DOIhttps://doi.org/10.5989/jsgs.21.2_3
    JOURNAL FREE ACCESS
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    In the computer-aided designs for castings or forgings, we encounter many complex shaped surfaces, which are difficult to create or evaluate even with use of modern CAD systems. Further, structural or mechanical engineers are annoyed with lack of methodology to evaluate adaptiveness of generated surfaces; conventional graphic tools are unuseful in the above cases.
    In the present study, one proposes an engineering method to deal with curved surfaces appearing in the practical designs. Based on the differential geometry and computational processings, the proposed approach employs an indicator for evaluation of curved surfaces, and gauss image is applied to represent the distribution of gauss curvetures. Through rough comparison of generated gauss images, one can see differences of curved surfaces. Furthermore, using the present approach, one can estimate the graphical accuracy of approximate triangular development method for both developable and undevelopable surfaces.
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  • Extended Z-BUFFER Method on a Personal Computer
    Reiji TSURUNO, Sachiko MIYAZOE, Hideyuki ISOYAMA, Sadahiko NAGAE
    1987 Volume 21 Issue 2 Pages 11-17
    Published: 1987
    Released on J-STAGE: August 25, 2010
    DOIhttps://doi.org/10.5989/jsgs.21.2_11
    JOURNAL FREE ACCESS
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    Recently, most of CG (computer graphics) have been changing from methods of vector scan graphics which are represented with lines, to methods of luster scan graphics with surfaces. The latter methods represent objects as being in the state of natural hue, therefore we need a high resolutional full-colored CRT and computer in order to display natural pictures. They are composed of, for example, a CRT, a large scale flame buffer where millions of colors are displayed, algorithm and processing of hardwares. So lots of beautiful pictures are published, which are drawn with specific machines and super computers. On the other hand, it can be said in using a micro computer that (1) the executing CG consumes much time, (2) the pixels are coarser to display CG, and (3) the number of colors is fewer than that in the above methods. We, however, can get quite beautiful pictures if we spend more time and efforts.
    In this study, we tried successfully to use the specified Z-buffer method that is one of the luster scan graphics methods. In addition, special semi-transparent and shadowing techniques are introduced to display more beautiful are natural images as its advanced applications with the low priced hardwares.
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  • [title in Japanese]
    [in Japanese], [in Japanese], [in Japanese], [in Japanese]
    1987 Volume 21 Issue 2 Pages 19-24
    Published: 1987
    Released on J-STAGE: August 25, 2010
    DOIhttps://doi.org/10.5989/jsgs.21.2_19
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1987 Volume 21 Issue 2 Pages 25-32
    Published: 1987
    Released on J-STAGE: August 25, 2010
    DOIhttps://doi.org/10.5989/jsgs.21.2_25
    JOURNAL FREE ACCESS
    Download PDF (548K)
  • [title in Japanese]
    [in Japanese]
    1987 Volume 21 Issue 2 Pages 33-40
    Published: 1987
    Released on J-STAGE: August 25, 2010
    DOIhttps://doi.org/10.5989/jsgs.21.2_33
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    1987 Volume 21 Issue 2 Pages 41-54
    Published: 1987
    Released on J-STAGE: August 25, 2010
    DOIhttps://doi.org/10.5989/jsgs.21.2_41
    JOURNAL FREE ACCESS
    Download PDF (3140K)
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