# cullingLayerMask

> The cullingLayerMask value of the object from which the culling is invoked. The draw command is discarded by the internal culling if the expression (1 << layer) & cullingLayerMask is false. Using this field is optional, use it for performance or other optimization purposes.

## Definition

* **Type:** Field
* **Namespace:** [UnityEngine.Rendering](/engine/6000.5/script-reference/unityengine/rendering.md)
* **Assembly:** UnityEngine.CoreModule

```csharp
public readonly uint cullingLayerMask
```