# ParticleSystemCollisionType

> The type of collisions to use for a given Particle System.

## Definition

* **Type:** Enum
* **Namespace:** [UnityEngine](/engine/6000.5/script-reference/unityengine.md)
* **Assembly:** UnityEngine.ParticleSystemModule

```csharp
public enum ParticleSystemCollisionType
```

## Fields

| Value                                                                                       | Description                      |
| ------------------------------------------------------------------------------------------- | -------------------------------- |
| [Planes](/engine/6000.5/script-reference/unityengine/particlesystemcollisiontype/planes.md) | Collide with a list of planes.   |
| [World](/engine/6000.5/script-reference/unityengine/particlesystemcollisiontype/world.md)   | Collide with the world geometry. |