| DetailPrototype | Detail prototype used by the Terrain GameObject. |
| SplatPrototype | A Splat prototype is just a texture that is used by the TerrainData. |
| Terrain | The Terrain component renders the terrain. |
| TerrainData | The TerrainData class stores heightmaps, detail mesh positions, tree instances, and terrain texture alpha maps. |
| TerrainExtensions | Extension methods to the Terrain class, used only for the UpdateGIMaterials method used by the Global Illumination System. |
| Tree | Tree Component for the tree creator. |
| TreePrototype | Simple class that contains a pointer to a tree prototype. |