hi, heres a picture of what a nizid shader looks like.
Yeah, i've seen that tut before and its rreally nice for the colour but its not very good for ink lines. Like most cel shaders out there, getting ink lines for curved surfaces is relatively easy but getting ink lines for straight edges is another thing all together. thats where a nizid shader comes in, the shader you see here is the renderman shader, i would love to recreate it in maya. this image can be edge detected in a good compositor or even photoshop to get really nice edges for all types of surfaces, straight and curved.