Your best bet may be to make the plane white (with brilliance .00001 so that
the angle of the light source doesn't affect it) and the light source white,
so that you get a greyscale image. Then use a 2D image editor to use this
image as the alpha channel (in Photoshop, as a mask) to a fully black image.

 - Slime
 [ http://www.slimeland.com/ ]

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