| terrain | The Terrain from which the Terrain Layer originates. | 
| terrainLayer | The Terrain Layer object to show the Inspector for. | 
| terrainLayerEditor | Reference to a variable of type Editor in which Unity caches the Terrain Layer Inspector object. | 
| customGUI | The custom Terrain Layer GUI object. | 
This helper function shows the Terrain Layer Inspector GUI nested inside the current Inspector GUI.
See Also: ITerrainLayerCustomUI, Editor.DrawFoldoutInspector.