Cel-shading with optimized outlines for Unity

Hi, today I will present my most ambitious project till today related to Unity Shaders and Visual effects, a fully customizable Toon Cel-shading with optimized outlines for the game I’m currently working on, Kivik.

This Cel-shading contains:

- Toon style effect.

- Compatibility with customizable color gradients, for changing how the shadows are represented in the shader if needed.

- Cast shadows of the 3D models.

- Compatibility with multiple lights in a scene, not only the directional light.

- Optimized outlines, in other words, this outline were achieved without having to double the model geometry, so the performance of the game will not be affected.

- Customizable outlines in the Unity Inspector.

In-game result (this image shows work in a prototype stage): 

Multiple lights demonstration:

Optimized outlines demonstration:

*All the models used for this post were downloaded in the TheModelsResource website