# onRenderingLayerCountChanged

> An event triggered when the count of defined rendering layers changes.

## Definition

* **Type:** Field
* **Namespace:** [UnityEditor.Rendering](/engine/6000.7/script-reference/unityeditor/rendering.md)
* **Assembly:** UnityEditor.CoreModule

```csharp
public static Action onRenderingLayerCountChanged
```

### Remarks

This can occur when rendering layers are added or removed in [Tags and Layers manager](/engine/6000.7/manual/unity-editor/editor-settings-reference/comp-manager-group/class-tag-manager.md). Ensure your event handlers are unsubscribed when no longer needed.