# FindTerrainLayerIndex(Terrain, TerrainLayer)

> Finds the index of a TerrainLayer in a Terrain tile.

## Definition

* **Type:** Method
* **Namespace:** [UnityEngine.TerrainTools](/engine/6000.5/script-reference/unityengine/terraintools.md)
* **Assembly:** UnityEngine.TerrainModule

```csharp
public static int FindTerrainLayerIndex(Terrain terrain, TerrainLayer inputLayer)
```

### Parameters

**** (\[Terrain]\(/engine/6000.5/script-reference/unityengine/terrain)): Terrain tile.**** (\[TerrainLayer]\(/engine/6000.5/script-reference/unityengine/terrainlayer)): Terrain layer to search for.

### Returns

| Type                                                       | Description                                                                    |
| ---------------------------------------------------------- | ------------------------------------------------------------------------------ |
| [int](https://learn.microsoft.com/dotnet/api/system.int32) | Returns the index of the terrain layer if it exists or -1 if it doesn't exist. |