| originTerrain | Defines the grid origin and size, as well as group id if no filter is specified. |
| gridOrigin | Origin of the grid. |
| gridSize | Size of the grid. Typically takes the terrain size.x and size.z. |
| filter | Filter to be applied when populating the map. See Also: TerrainFilter. If null, the filter will fall back to matching terrains in the same group as the origin. |
| fullValidation | Validate the Terrain map. Default is true. |
TerrainMap The resulting Terrain map. Can return null when no Terrain objects pass the filter.
Creates a TerrainMap from the positions of all active Terrains.
Creates a TerrainMap of all the loaded Terrain objects that pass the TerrainFilter validation.