The facing ratio shader can be used to create a toon shading effect. A tutorial can be found here.
As this is a frequently asked question we have provided both the question and answer in this thread.
facing ratio method is too generic and dones't allow to direct light.
how do you do a Toon shader depending on the light and oclussion?
Lee, I stuck with this method here, in Houdini:
Any suggestion how to connect the Facing Ratio shader to the U parameter?
Hi @Lee Griggs, Is there any way to do the same effect of the Surface Luminance in Cinema 4D? Thanks!