# TerrainExtensions

> Extension methods to the Terrain class, used only for the UpdateGIMaterials method used by the Global Illumination System.

## Definition

* **Type:** Class
* **Namespace:** [UnityEngine](/engine/6000.7/script-reference/unityengine.md)
* **Assembly:** UnityEngine.TerrainModule

```csharp
public static class TerrainExtensions
```