Despite the non-physicality, Cel shading artists usually wants to control the lighting of a character separately to the global settings, to obtain better shape of Cel shading boundaries, etc. The Character Cel Shading Pack supports such a need by providing custom light parameter options in the material instances.
The Custom Character Lighting options in the material instance have custom light direction, custom diffuse light color, and custom specular light color options. They are designed to have static switches so as to minimize performance overheads when the custom lighting is not used. Notice that we enabled separated diffuse and specular light colors for more artistic control of character outlook.
Figure 4. Custom Character Lighting options in the material instances