# occlusionMaskChannel

> In case of a LightmapBakeType.Mixed light, contains the index of the occlusion mask channel to use if any, otherwise -1.

## Definition

* **Type:** Field
* **Namespace:** [UnityEngine](/engine/6000.0/script-reference/unityengine.md)
* **Assembly:** UnityEngine.CoreModule

```csharp
public int occlusionMaskChannel
```