# SetPlane(int, Transform)

> Set a collision plane to use with this Particle System.

## Definition

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

```csharp
public void SetPlane(int index, Transform transform)
```

### Parameters

**** (\[int]\(https\://learn.microsoft.com/dotnet/api/system.int32)): The plane entry to set.**** (\[Transform]\(/engine/6000.5/script-reference/unityengine/transform)): The plane to collide particles against.

### Remarks

If the index is greater than the number of planes currently assigned to the Particle System, Unity adds empty entries to ensure the list is large enough.

### Examples

```csharp
using UnityEngine;
using System.Collections;

[RequireComponent(typeof(ParticleSystem))]
public class ExampleClass : MonoBehaviour
{
    private ParticleSystem ps;

    void Start()
    {
        ps = GetComponent<ParticleSystem>();

        var collision = ps.collision;
        collision.enabled = true;
        collision.type = ParticleSystemCollisionType.Planes;
        collision.mode = ParticleSystemCollisionMode.Collision3D;

        var collider = GameObject.CreatePrimitive(PrimitiveType.Plane);
        collider.transform.parent = ps.transform;
        collider.transform.localPosition = new Vector3(0.0f, 0.0f, 5.0f);
        collider.transform.localScale = new Vector3(20.0f, 20.0f, 20.0f);
        collider.transform.localRotation = Quaternion.Euler(new Vector3(-90.0f, 0.0f, 0.0f));

        collision.SetPlane(0, collider.transform);
    }
}
```