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A simple method for rendering penumbrae caused by sunlight |
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| Authors: | Shinichi Takita Kazufumi Kaneda Toshio Akinobu Haruhiko Iriyama Eihachiro Nakamae Tomoyuki Nishita |
| Affiliation: | (1) Kagawa University, Saiwai-cho, 760 Takamatsu, Japan;(2) Hiroshima University, Kagamiyama, 724 Higashi-hiroshima, Japan;(3) Sharp Electric Co., Higashi-hiroshima, 739-01, Japan;(4) ASCH Co., 12-1 Minamikurokawa Aso-ku, 215 Kawasakishi, Japan;(5) Fukuyama University, Higashimura-cho, 729-02 Fukuyama, Japan |
| Abstract: | A simple rendering method for penumbrae caused by sunlight is proposed to create more realistic outdoor scenery. Only four points are used to define the penumbra area cast by a contour edge so that little storage is needed for penumbra areas. Complex penumbrae caused by such objects as curtains can be rendered. Calculation of illumination in the shadows cast by natural objects, such as trees, mapped on a transparent virtual plane is available. In order to show the usefulness of the proposed method, some computer-generated images with penumbrae are compared with those without penumbrae. |
| Keywords: | Realism Penumbra Sunlight Transparency mapping Scanline algorithm |
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