Nice. Did you 'invented' this shader by yourself? ARM book contains 
examples of such shaders. Unfortunately most advanced of them can't be 
applied to POVMan, as POVMan doesn't support surface derivatives, which 
are necessary for calculation of cel lines with uniform width. As it 
could be seen on this picture and other 'pure-povray' approaches, line 
widths depend from object geometry. Perhaps better results could be 
achieved with specific patch by J. Grimbert, but this requires as well 
surface derivative calculation...

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