# useAutoRandomSeed

> Controls whether the Particle System uses an automatically-generated random number to seed the random number generator.

## Definition

* **Type:** Property
* **Namespace:** [UnityEngine](/engine/6000.0/script-reference/unityengine.md)
* **Assembly:** UnityEngine.ParticleSystemModule

```csharp
public bool useAutoRandomSeed { get; set; }
```

### Remarks

If set to true, the Particle System will generate a new random seed each time it is played. If set to false, [ParticleSystem.randomSeed](/engine/6000.0/script-reference/unityengine/particlesystem/randomseed.md) will be used instead, allowing for a constant seed (useful if you want your particles to play in exactly the same way each time) or user-defined random value (for example, you may want to cycle through an array of seeds).