Download AAA Terrain by Anio free unity
This uniquely designed package is the most powerful shader for Unity’s terrain.
They allow to you create a NextGen surface for your terrain using a DirectX 11 tessellation.
This material support a real-time painting using 4 brushes on one terrain.
Our algorithm using a LOD for calculating a count of an additive mesh. That means that your terrain will NOT require more calculation than needed.
For start, you just must set a material based on our shader to your terrain and set displacement maps.