转自：https://dawnarc.com/2018/01/ue4cel-shading%E5%8D%A1%E9%80%9A%E6%B8%B2%E6%9F%93/
Cel Shading Post Process
https://wiki.unrealengine.com/Cel_Shading_Post_Process
UE4 Tutorial: Toon Shader (Borderlands/Jet Set Radio)
https://www.youtube.com/watch?v=0UBNXneL1oo
UE4 - Tutorial - Cel Shading!
https://www.youtube.com/watch?v=_bpQoI5Xrx8
Stylized Rendering Post Processing
https://docs.unrealengine.com/en-us/Resources/Showcases/Stylized/PostProcessing
Unreal Engine 4 Cel Shading Tutorial
https://www.raywenderlich.com/146-unreal-engine-4-cel-shading-tutorial
UE4 Cel Shader Part 1
https://medium.com/@jowie94/ue4-cel-shader-part-1-1f8361e61878