MARS Master Material Mask Baker provides 14 basic masks and output splat textures (or Landscape Samples) for mesh and landscape. It's useful for Landscape Auto Material and Material Layer Blending.
Masks including: Material Alpha | Custom Alpha | Vertex Color | Landscape Sample | Top Complex | Top | Slope | Direction | Distance | Elevation | Mesh Curvature | Texture Curvature | 3D Noise | Height
Mask Blending Modes: Multiply | Add | Overlay | Subtract | Average
Also see complete product: MARS Master Material
Check details in: Document Link