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Graphics/Simulation/Clouds & sky light

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A Simple, Efficient Method for Realistic Animation of Clouds
2000 - Y.Dobashi, K.Kaneda, H.Yamashita, T.Okita, T.Nishita
This paper describes how to animate and render realistic clouds with shadowing and light shafts. It is based on a simplified model of cloud formation so it is not physically exact. It is fast but still not fast enough for real-time animation.

A Practical Analytic Model for Daylight
1999 - A. J. Preetham, Peter Shirley, Brian Smits
This article shows how to render scenes with realistic sunlight, based on the sun's position on the sky.

Real-time Cloud Rendering
Sep 2001 - Mark J. Harris, Anselmo Lastra
This article describes a technique for very fast rendering of realistically lighted non-animated clouds. This is very useful for games where the view is up in sky and near the clouds.

Real-Time Cloud Rendering and Animation
2003 - J. Schpok, J. Simons, D. S. Ebert, C. Hansen

Real-Time Atmospheric Scattering
May, 2004 - Sean O'Neil
This article shows how to do the necessary calculations to render a planetary atmosphere as seen from space. It takes into account the suns locations, the location of the camera, and the planet's shadow.

Real-time realistic illumination and shading of stratiform clouds
Aug, 2006 - Antoine Bouthors, Fabrice Neyret, Sylvain Lefebvre

Precomputed Atmospheric Scattering
2008 - Eric Bruneton, Fabrice Neyret