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A Simple Rendering for Penumbra Caused by Sunlight

  • Conference paper
CG International ’90

Abstract

A simple rendering method for penumbra caused by sunlight is proposed to create more realistic outdoor scenery. To reduce the storage needed for penumbra areas, only four points are used to define a penumbra area. The proposed method can render complex penumbra scenes caused by such objects as curtains. In addition, the calculation method of illumination in the shadows cast by natural objects, such as trees, mapped on a transparent virtual plane are discussed. The photographs of computer generated images with penumbrae are compared to those without penumbra. Those photographs show the usefulness of the proposed method.

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References

  • Amanatides J (1984) Ray Tracing with Cones. Computer Graphics 18(3):129–135

    Article  Google Scholar 

  • Appel A (1969) On Calculating the Illusion of Reality. Hardware:945

    Google Scholar 

  • Brotman LS and Balder NI (1984) Generating Soft Shadows with Depth Buffer Algorithm. IEEE CG&A 4(10):5–12

    Google Scholar 

  • Cook RL (1984) Distributed Ray Tracing. Computer Graphics 18(3):138

    Google Scholar 

  • Crow FC (1977) Shadow Algorithms for Computer Graphics. Computer Graphics 11(3):242–248

    Article  Google Scholar 

  • Kaneda K, Akinobu T, and Nakamae E (1989) A Display Method of Trees by Using Photo Images. Proc. IPSJ:907–908 (in Japanese)

    Google Scholar 

  • Nishita T and Nakamae E (1974) An Algorithm for Halftoned Representation of Three Dimensional Objects. Inf. Proc. Japan 14:93–99

    MATH  Google Scholar 

  • Nishita T and Nakamae E (1983) Half-Tone Representation of 3D Objects Illuminated by Area Sources or Polyhedron Sources. IEEE Proc. COMPSAC83:237–242

    Google Scholar 

  • Nishita T and Nakamae E (1985) Shading Models for Point and Linear Sources. ACM Transaction on Graphics 14(2):124–126

    Article  Google Scholar 

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Author information

Authors and Affiliations

  1. Faculty of Education, Kagawa University, 1-1 Saiwa-cho, Takamatsu, 760, Japan

    Shinichi Takita

  2. Faculty of Engineering, Hiroshima University, Saijo-cho, Higashi-hiroshima, 724, Japan

    Kazufumi Kaneda, Toshio Akinobu, Haruhiko Iriyama & Eihachiro Nakamae

  3. Faculty of Engineering, Fukuyama University, Sanzo, Higashimura-cho, Fukuyama, 729-02, Japan

    Tomoyuki Nishita

Authors
  1. Shinichi Takita
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  2. Kazufumi Kaneda
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  3. Toshio Akinobu
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  4. Haruhiko Iriyama
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  5. Eihachiro Nakamae
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  6. Tomoyuki Nishita
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Editor information

Editors and Affiliations

  1. Institute of Systems Science, National University of Singapore, 0511, Kent Ridge, Singapore

    Tat-Seng Chua (Senior Lecturer) (Senior Lecturer)

  2. Department of Information Science, Faculty of Science, University of Tokyo, Tokyo, 113, Japan

    Tosiyasu L. Kunii (Professor and Chairman) (Professor and Chairman)

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© 1990 Springer-Verlag Tokyo

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Cite this paper

Takita, S., Kaneda, K., Akinobu, T., Iriyama, H., Nakamae, E., Nishita, T. (1990). A Simple Rendering for Penumbra Caused by Sunlight. In: Chua, TS., Kunii, T.L. (eds) CG International ’90. Springer, Tokyo. https://doi.org/10.1007/978-4-431-68123-6_12

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  • DOI: https://doi.org/10.1007/978-4-431-68123-6_12

  • Publisher Name: Springer, Tokyo

  • Print ISBN: 978-4-431-68125-0

  • Online ISBN: 978-4-431-68123-6

  • eBook Packages: Springer Book Archive

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