It blends diffuse/normal/spec/glow from one set of textures to another set of textures in real time.
You can control the mix between the two set of textures by script changing a value used by the shader.

It blends two sets of diffuse/specular/normal/glow maps

How to use :
-Create a new material
-Put all maps in the slots
-In the script change the name of the material