# speedRange

> Specify how particle speeds are mapped to the animation frames.

## Definition

* **Type:** Property
* **Namespace:** [UnityEngine](/engine/6000.7/script-reference/unityengine.md)
* **Assembly:** UnityEngine.ParticleSystemModule

```csharp
public Vector2 speedRange { get; set; }
```

### Remarks

If a particle is travelling slower than the minimum speed, it uses the first frame. If a particle is travelling faster than the maximum speed, then it uses the final frame. For all other speeds, the particle chooses a frame based on how far between the minimum and maximum value its speed is.

### Examples

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

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

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

        var textureSheetAnimation = ps.textureSheetAnimation;
        textureSheetAnimation.enabled = true;
        textureSheetAnimation.speedRange = new Vector2(0.9f, 5.0f);
    }
}
```