source: GTP/branches/IllumWPdeliver2008dec/IlluminationWP/demos/Standalone/Explosion [DirectX]/ReadMe.txt @ 3255

This application demonstrates spherical billboards. Spherical billboards treate particles as spheres while still render them as quads. During fragment processing the spherical geometry of particles are considered. The main idea is to compute the real length a light ray travells inside a particle and alter it's opacity according this information. This way typicall billboard rendering artifacts such as billboard clipping and popping (sudden appear or dissapear of billboards because of frontplane clipping) can be eliminated.

The demo also demonstrates realistic fire and smoke shading, as well as post processing effects like heat shimmering and motion blur.

Usage:
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Mouse controlls the camera orientation.
Sliders adjust fire, smoke and dust optical parameters, and post processing effects.

Run:
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Copy Explosion.exe (from the Debug or Release directory) to the solution'S directory and run.

Build:
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Simply run and build the solution (Explosion.sln)