I don't know how MN did that. When I use Edge_Blend on Andy, I don't get consistent line widths like that. Sometimes nothing, and sometimes a big black area (not a line) is produced.

An edge that doesn't point away from the camera is not detected.

An area that points away from the camera but is not an edge (like a sloped shoulder) can trigger the black.

I don't know if Olivier found a better scheme of some sort. His examples always look good, but maybe he carefully selected his examples and didn't publish any of the failures. I publish the failures, and if I can't eliminate them, I don't stand behind the shader and don't want people to use it.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)