Dual Textured
入手：
Dual Textured | Unity Asset Store [Official]
Layers Shader Pack
動画：
入手：
Rust, Dust and Layers Shader Pack | Unity Asset Store [Official]
フォーラム：
Rust, Dust and Layers Shader Pack | Unity Forum
Layered Materials
入手：
Layered Materials | Unity Asset Store [Official]
Shader Sandwich
**UNMAINTAINED**
動画：
How to Make a Unlit Terrain Shader
公式サイト：
Shader Sandwich | Electronic Mind Studios [Official]
入手：
Shader Sandwich | Unity Asset Store [Official]
フォーラム：
Shader Sandwich – A Powerful Layer Based Shader Editor for Artists | Unity Forum
参考：
How to make a Unlit Terrain Shader | Max Kruf
Better Shaders
動画：
Converting from a Surface Shader
入手：
Better Shaders – Standard / URP / HDRP | Unity Asset Store [Official]
フォーラム：
Better Shaders – An improved Surface Shader system for Standard, URP, HDRP | Unity Forum