And yet another version with the light's position changed slightly. I 
think I'll quit for now. It's been fun :) I dropped the MegaPOV file for 
finding edges over at p.t.scene-files in case you're interested:
http://news.povray.org/povray.text.scene-files/thread/%3C4c1beb00%40news.povray.org%3E/

I'm not sure it will work for your purposes, since there are still many 
errors present. If I could discover a way to keep the lines from 
drifting in weird ways, it could be more useful. There is still one more 
idea I have left to try, but it's a long shot.

I took a gander at your helicopter-colouring files, and I'm not sure I 
can make that method work with mine. Also, I got my edge pattern to work 
with an obj file of the helicopter, but really ugly effects crop up.

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