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Real-Time Atmospheric Rendering From Any Viewpoint

We will describe an algorithm that uses modern graphics hardware to render a realistically looking approximation of the atmosphere at interactive frame rates. We will base our method on an algorithm by Dobashi, Yamamoto and Nishita (2002) and adapt it to work equally well from any viewpoint. Rendering the atmosphere in a realistic way is essential in virtually any rendering of outdoor scenes, from landscapes to pictures of the solar system. The atmosphere in landscapes provides the typical colour gradations in the sky, whereas displaying the atmosphere as seen from outer space adds to the sense of realism. Atmospheric rendering is a difficult problem because of the scattering of light that travels through air or another gaseous medium. A great amount of work in this field has been done by T. Nishita in cooperation with several other authors, building on earlier work by R. Victor Klassen, amongst others. The focus can either be on physically correct modelling or on creating a visually appealing picture without strict requirements of accuracy, where only the latter is feasible to do in real-time on current hardware. Some authors focus only on rendering the atmosphere from a certain point of view, e.g., only from the ground. Assuming only a limited range of viewpoints is insufficient if one wants to display, for example, the launch of a space rocket. These problems are tackled by the described algorithm.