Abstract
A new lighting model for natural light in cloudy sky is proposed. In order to represent cloudy scenes and the distribution of the natural light in the cloudy sky, the sky in the model is expressed by a part of a sphere which is called S surface. A layer, called C layer, is set just under the S surface to deal with the distribution of clouds. The natural light is supposed to be given by finite point light sources on the S surface, and three kinds of light components--direct light, scattering light and ambient light are used in each point light source to represent the natural light in various weather conditions. The spectrum in the model varies with the sun altitude.
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