This package offers a surface shader with a similar setup to Unity's standard shaders that supports up to 4 blendable layers. The layers are controlled by the vertex colour of the mesh it is applied to, and can be edited in a 3D modelling package or with a tool like Polybrush.
The material is controlled with a custom inspector similar to the Unity Standard shader one.
This package can be installed using the Unity Package manager. Add it as a git package.
Supports Unity 2018.1+
Released under the MIT license. See LICENSE for details.