The ToonHoldout shader is a specialized utility node that can be used to make certain objects appear in front of others even though they would in reality be obscured. Specifically, this shader was developed to render a character’s eyes and eyebrows over her hair.
In manga and anime it is quite common to have eyes and eyebrows rendered over the hair, even though this may seem implausible or physically incorrect.
This setup is extremely complicated to achieve without this shader but adds a lot to create the illusion of hand-painted art.
Usage
Using ToonHoldout couldn’t be easier: Plug it into the ToonShader’s transparency slot and specify the names of the objects you want to see through to and you are good to go!
