# PhysicsCallbacks.ContactCallbackTargets.ContactBeginTarget

> Contact begin event target for callbacks.

## Definition

* **Type:** Struct
* **Namespace:** [UnityEngine.LowLevelPhysics2D](/engine/6000.3/script-reference/unityengine/lowlevelphysics2d.md)
* **Assembly:** UnityEngine.Physics2DModule

```csharp
public readonly struct PhysicsCallbacks.ContactCallbackTargets.ContactBeginTarget
```

## Properties

| Property                                                                                                                                                | Description                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
| ------------------------------------------------------------------------------------------------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| [beginEvent](/engine/6000.3/script-reference/unityengine/lowlevelphysics2d/physicscallbacks/contactcallbacktargetscontactbegintarget/beginevent.md)     | The event.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
| [shapeTargetA](/engine/6000.3/script-reference/unityengine/lowlevelphysics2d/physicscallbacks/contactcallbacktargetscontactbegintarget/shapetargeta.md) | The callback target ([PhysicsShape.callbackTarget](/engine/6000.3/script-reference/unityengine/lowlevelphysics2d/physicsshape/callbacktarget.md)) associated with [PhysicsEvents.ContactBeginEvent.shapeA](/engine/6000.3/script-reference/unityengine/lowlevelphysics2d/physicsevents/contactbeginevent/shapea.md). This returns any implemented [PhysicsCallbacks.IContactCallback](/engine/6000.3/script-reference/unityengine/lowlevelphysics2d/physicscallbacks/icontactcallback.md) or NULL if not implemented or no target. |
| [shapeTargetB](/engine/6000.3/script-reference/unityengine/lowlevelphysics2d/physicscallbacks/contactcallbacktargetscontactbegintarget/shapetargetb.md) | The callback target ([PhysicsShape.callbackTarget](/engine/6000.3/script-reference/unityengine/lowlevelphysics2d/physicsshape/callbacktarget.md)) associated with [PhysicsEvents.ContactBeginEvent.shapeB](/engine/6000.3/script-reference/unityengine/lowlevelphysics2d/physicsevents/contactbeginevent/shapeb.md). This returns any implemented [PhysicsCallbacks.IContactCallback](/engine/6000.3/script-reference/unityengine/lowlevelphysics2d/physicscallbacks/icontactcallback.md) or NULL if not implemented or no target. |