# instanceID

> The Material instance id whose Material CRC was computed during the RayTracingAccelerationStructure.CullInstances call.

## Definition

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

```csharp
public int instanceID
```