Usually you use a toon-shader to create a toon-feel in your 3D applications. There's lot's of plug-ins on the web for a lot of mayor 3D packages. I've heard that 3DSMax5 had a nice toon-shader with lot's of great settings. I don't know any good books about the subject. I've been trying to create a toony look in bryce, but it's very difficult and doesn't work on all kinds of objects. (round shapes are almost impossible to get right and toony)

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