# layer

> The Layer used by the ray tracing instance.

## Definition

* **Type:** Field
* **Namespace:** [UnityEngine.Rendering](/engine/6000.6/script-reference/unityengine/rendering.md)
* **Assembly:** UnityEngine.CoreModule

```csharp
public int layer
```

### Remarks

When you manually add ray tracing instances to a [RayTracingAccelerationStructure](/engine/6000.6/script-reference/unityengine/rendering/raytracingaccelerationstructure.md), [RayTracingAccelerationStructure.AddInstance](/engine/6000.6/script-reference/unityengine/rendering/raytracingaccelerationstructure/addinstance.md) filters instances based on the acceleration structure's Layer Mask.

Additional Resources: RayTracingAccelerationStructure.Settings