Highly realistic visual simulation of outdoor scenes under various atmospheric conditions
CG International '90 Proceedings of the eighth international conference of the Computer Graphics Society on CG International '90: computer graphics around the world
A practical analytic model for daylight
Proceedings of the 26th annual conference on Computer graphics and interactive techniques
A physically-based night sky model
Proceedings of the 28th annual conference on Computer graphics and interactive techniques
Astronomical Formulae for Calculators
Astronomical Formulae for Calculators
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Modeling illumination of outdoor objects by natural light sources - the Sun, the Moon and the stars - is a very difficult problem due to highly complex physics of light rays and the Earth's atmosphere. Although there are many studies in the literature on modeling of astronomic and atmospheric phenomena, of emission, scattering and absorption of light rays through the atmosphere, and of the illumination of surfaces; it is very difficult to reach these algorithms, equations and their parameter values readily available in a single source. In this paper, we present an approach that collects available methodologies in the literature into one consistent model for direct (non-scattered) illumination during daytime and at night, which is a part of an ongoing project that started in November 2002.