# OnTerrainLayerGUI(TerrainLayer, Terrain)

> Draws the custom GUI for the terrain layer.

## Definition

* **Type:** Method
* **Namespace:** [UnityEditor](/engine/6000.5/script-reference/unityeditor.md)
* **Assembly:** UnityEditor

```csharp
bool OnTerrainLayerGUI(TerrainLayer terrainLayer, Terrain terrain)
```

### Parameters

**** (\[TerrainLayer]\(/engine/6000.5/script-reference/unityengine/terrainlayer)): The TerrainLayer object.**** (\[Terrain]\(/engine/6000.5/script-reference/unityengine/terrain)): The Terrain object on which the TerrainLayer object, specified by the terrainLayer parameter, is selected.

### Returns

| Type                                                          | Description                                                                                                        |
| ------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------ |
| [bool](https://learn.microsoft.com/dotnet/api/system.boolean) | Return false to have Unity draw the default TerrainLayer inspector. Otherwise draw the custom GUI and return true. |