Is it true that the Terrain Layers Material can only accept Diffuse, Normal, and Mask Maps?

The assertion that the Terrain Layers Material can only accept Diffuse, Normal, and Mask Maps is true. In Unity, the Terrain System utilizes these specific types of textures to create complex and visually appealing terrains.

The Diffuse Map is essential for defining the base color and detail of the terrain surface; it determines how the terrain will appear overall. The Normal Map is used to create the illusion of depth and detail on the terrain's surface without adding additional geometry, simulating light interaction on the surface. The Mask Map plays a crucial role in blending multiple textures together, allowing for more complex materials that can have different textures appear in various areas of the terrain based on the mask.

This combination of maps is fundamental to achieving realistic lighting and texturing on terrain in Unity, making these three types of maps integral to the Terrain Layers Material's functionality. Other types of maps, while useful for different applications, are not part of the Terrain Layers Material specifications in this context.