# PhysicsEvents.WorldTransformPlaneChangeEventHandler

> Event handler for a world transform-plane change event callback.

## Definition

* **Type:** Delegate
* **Namespace:** [Unity.U2D.Physics](/engine/6000.7/script-reference/unity/u2d/physics.md)
* **Assembly:** UnityEngine.PhysicsCore2DModule

```csharp
public delegate void PhysicsEvents.WorldTransformPlaneChangeEventHandler(PhysicsWorld world, PhysicsWorld.TransformPlane oldTransformPlane, PhysicsWorld.TransformPlane newTransformPlane)
```