# layer

> The layer used by the ray tracing instances.

## Definition

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

```csharp
public int layer { readonly get; set; }
```

### Remarks

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

Additional Resources: [RayTracingAccelerationStructure.Settings](/engine/6000.6/script-reference/unityengine/rendering/raytracingaccelerationstructure/settings.md).