Generating Spherical Distance Fields from Polygons(experilous.com)
experilous.com
Generating Spherical Distance Fields from Polygons
http://experilous.com/1/blog/post/generating-spherical-distance-fields-from-polygons
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http://experilous.com/1/blog/post/generating-spherical-distance-fields-from-polygons
http://gamma.cs.unc.edu/DIFI/Sud-EG04-DiFi-Presentation.pdf
The technique in the article is similar, but uses brightness and the minimum blending operator instead of depth -- which has the advantage that you can use it to generate distance fields over surfaces other than the plane, which is pretty cool.