# Manual

> Gives user control over populating and updating the RayTracingAccelerationStructure.

## Definition

* **Type:** Field
* **Namespace:** [UnityEngine.Rendering](/engine/6000.7/script-reference/unityengine/rendering.md)
* **Assembly:** UnityEngine.CoreModule

```csharp
Manual = 0
```

### Remarks

If the ManagementMode is set to Manual, then you must call [RayTracingAccelerationStructure.AddInstance](/engine/6000.7/script-reference/unityengine/rendering/raytracingaccelerationstructure/addinstance.md) to add an instance to the RayTracingAccelerationStructure. Call \[RayTracingAccelerationStructure.UpdateInstanceTransform]] to update a given instance's transform.