How to use splat maps with materials instead of 2D Textures?

Hello everyone!

I'm developing a custom scenario where I want to use parallax or tesselation shaders on the terrain and others custom meshes with procedural materials.

I tried to create a custom splatmap in 3Ds Max for the terrain, it worked. But I can't find a way to change the RGBA values to Materials instead of 2D textures.

Basically what I'm trying to do is painting the different materials in 3D Max and export the mesh to unity to add the engine materials instead.

Here's a video with a good example of what i'm trying to do: (The example starts in 26:10 and goes until 35:27) http://youtu.be/Ma7JNQFhY0M?t=26m10s

What I've also tried:

-Creating a multi-sub object material in 3Ds Max, but it don't give any smooth texture blend.

-Using vertex paint in 3D max and exporting to unity

This would also be very useful to use when creating others custom procedural meshes or characters, like the huge titans in God of War 3.