How can I make a material/postprocessing effect to acheive ink shading like game Okami?

[Luos (Luos_83)]

@Jorgster;660043

Just add the lines in the texture. That way you both save performance and you’ll have 100% control on the look.

This is rather useless because in actual cellshader/toon ink the dark lines are only visible depending on the angle as well as lighting situations.
Actually adding them into the texture makes it look wrong, fake, and boring.