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Spotlight Math

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Hello! I'm making a demo and I'd appreciate any help to refresh my math. I am using the Polhemus Fastrak device (http://www.polhemus.com/?page=Motion_Fastrak) and will be writing a simple demo in Java and OpenGL to make a spotlight. The coordinates I am given are x, y, z, azimuth, elevation and roll. I will need to find the intersect with a plane (the background) to find out where the spotlight is to be shined. Can anyone refresh my math or point me to helpful tutorials? I'd much appreciate it. Cheers! stryderjzw

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ok ... I wan't be only sarcastic, here is one good explanation:

http://http.developer.nvidia.com/CgTutorial/cg_tutorial_chapter01.html

Read chapter about lightning.

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