# PhysicsCallbacks.TriggerCallbackTargets.TriggerBeginTarget

> Trigger 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.TriggerCallbackTargets.TriggerBeginTarget
```

## Properties

| Property                                                                                                                                                            | Description                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
| ------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| [beginEvent](/engine/6000.3/script-reference/unityengine/lowlevelphysics2d/physicscallbacks/triggercallbacktargetstriggerbegintarget/beginevent.md)                 | The trigger begin event.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
| [triggerShapeTarget](/engine/6000.3/script-reference/unityengine/lowlevelphysics2d/physicscallbacks/triggercallbacktargetstriggerbegintarget/triggershapetarget.md) | The callback target ([PhysicsShape.callbackTarget](/engine/6000.3/script-reference/unityengine/lowlevelphysics2d/physicsshape/callbacktarget.md)) associated with [PhysicsEvents.TriggerBeginEvent.triggerShape](/engine/6000.3/script-reference/unityengine/lowlevelphysics2d/physicsevents/triggerbeginevent/triggershape.md). This returns any implemented [PhysicsCallbacks.ITriggerCallback](/engine/6000.3/script-reference/unityengine/lowlevelphysics2d/physicscallbacks/itriggercallback.md) or NULL if not implemented or no target. |
| [visitorShapeTarget](/engine/6000.3/script-reference/unityengine/lowlevelphysics2d/physicscallbacks/triggercallbacktargetstriggerbegintarget/visitorshapetarget.md) | The callback target ([PhysicsShape.callbackTarget](/engine/6000.3/script-reference/unityengine/lowlevelphysics2d/physicsshape/callbacktarget.md)) associated with [PhysicsEvents.TriggerBeginEvent.visitorShape](/engine/6000.3/script-reference/unityengine/lowlevelphysics2d/physicsevents/triggerbeginevent/visitorshape.md). This returns any implemented [PhysicsCallbacks.ITriggerCallback](/engine/6000.3/script-reference/unityengine/lowlevelphysics2d/physicscallbacks/itriggercallback.md) or NULL if not implemented or no target. |