# ParticleSystemTriggerEventType

> The different types of particle triggers.

## Definition

* **Type:** Enum
* **Namespace:** [UnityEngine](/engine/6000.3/script-reference/unityengine.md)
* **Assembly:** UnityEngine.ParticleSystemModule

```csharp
public enum ParticleSystemTriggerEventType
```

## Fields

| Value                                                                                            | Description                                              |
| ------------------------------------------------------------------------------------------------ | -------------------------------------------------------- |
| [Enter](/engine/6000.3/script-reference/unityengine/particlesystemtriggereventtype/enter.md)     | Trigger when particles enter the collision volume.       |
| [Exit](/engine/6000.3/script-reference/unityengine/particlesystemtriggereventtype/exit.md)       | Trigger when particles leave the collision volume.       |
| [Inside](/engine/6000.3/script-reference/unityengine/particlesystemtriggereventtype/inside.md)   | Trigger when particles are inside the collision volume.  |
| [Outside](/engine/6000.3/script-reference/unityengine/particlesystemtriggereventtype/outside.md) | Trigger when particles are outside the collision volume. |