Toon is a very simple node that produces cartoon-style outlines on objects in the scene

Width Type - specifies weather the width of the lines will be measured in Pixels or in World units.

List - controls the meaning of the list input between an Include and an Exclude list

Color - this is the color of the outlines.

Width - specifies the width of the outlines.

Opacity - opacity of the outlines.

Distortion - a texture that will be used to distort the outlines. This works similar to bump-mapping and will take the gradient of the texture as direction for distortion. Note that high output values may be required for larger distortion. Screen-mapped textures work best, although World XYZ mapping is also supported.

List - a list of nodes to be included or excluded into the Toon effect