# ScatterAlphamap(string)

> Applies an edited alphamap PaintContext by copying modifications back to the source Terrain tiles.

## Definition

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

```csharp
public void ScatterAlphamap(string editorUndoName)
```

### Parameters

**** (\[string]\(https\://learn.microsoft.com/dotnet/api/system.string)): Unique name used for the undo stack.

### Remarks

Once the edits to a PaintContext are complete, the modified data in `destinationRenderTexture` must be applied to the textures stored in each Terrain. ScatterAlphamap will perform this copy, and re-normalize the other alphamap channels to maintain a sum of 1. This function will also create a delayed action to rebuild the basemap LOD texture.

This function is called internally by [TerrainPaintUtility.EndPaintTexture](/engine/6000.7/script-reference/unityengine/terraintools/terrainpaintutility/endpainttexture.md).

Additional Resources: [PaintContext.GatherAlphamap](/engine/6000.7/script-reference/unityengine/terraintools/paintcontext/gatheralphamap.md), [PaintContext.ApplyDelayedActions](/engine/6000.7/script-reference/unityengine/terraintools/paintcontext/applydelayedactions.md)