This one was inspired by the "cartoon" post process, although it doesn't 
share any of that code.(Thanks to TonyB for getting me started on this!) 
It finds the edges using two methods: finding sharp differences in 
surface normal, and finding sharp differences in depth. It takes 3 
parameters: a threshold for each of the edge finding algorithms, and a 
line color. This is an example of the output of the filter:

-- 
Christopher James Huff - Personal e-mail: chr### [at] yahoocom
TAG(Technical Assistance Group) e-mail: chr### [at] tagpovrayorg
Personal Web page: http://chrishuff.dhs.org/
TAG Web page: http://tag.povray.org/

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