A Fast, Accurate Rendering Method of Outdoor Scenes
Using an All-weather Skylight Model
Kazufumi Kaneda, Kazuhiro Tomida, Hideo Yamashita, Yoshinori Dobashi
Journal of the Institute of Image Electronics Engineers of Japan,
Vol. 28, No. 4, pp. 349-357 (1999) (in Japanese)
ABSTRACT
For architectural design using computer graphics,
it is required to accurately render outdoor scenes
from various viewpoints under several kinds of weather conditions
taking account of skylight.
To solve the problem, a fast calculation method of skylight illuminance
using a series of basis functions has been developed.
In this paper, we propose a extended version of the method,
that is, the proposed method can generate images quickly
when changing not only a weather condition and a solar position
but also a viewpoint.
Improving a method for subdividing a surfaceinto patches,
i.e., an adaptive subdivision follows surface subdivision
along the boundary of a shadow area,
the generated images are in high quality with fewer number of
subdivided patches.
An all-weather skylight illumination model makes it possible
to generate outdoor scenes under various kinds of weather conditions.
Several examples of outdoor scenes with a building demonstrate
the usefulness of the proposed method.
Keywords: Skylight, All-weather, Outdoor scenes, Adaptive subdivision
(a) Clear (e=5) (MPEG movie 1.3 MB).
(b) Cloudy (e=2).
(c) Change a viewpoint (MPEG movie 1.3 MB).
(d) Change the solar position (MPEG movie 1.3 MB).
Figure 7: Outdoor scenes generated by the proposed method.
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