# radiusSpeed

> In animated modes, this determines how quickly the particle emission position moves along the radius.

## Definition

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

```csharp
public ParticleSystem.MinMaxCurve radiusSpeed { get; set; }
```

### Remarks

The value is specified in world units. Additional Resources: [ParticleSystem.ShapeModule.radiusMode](/engine/6000.3/script-reference/unityengine/particlesystem/shapemodule/radiusmode.md), [ParticleSystemShapeMultiModeValue](/engine/6000.3/script-reference/unityengine/particlesystemshapemultimodevalue.md), [ParticleSystem.ShapeModule.shapeType](/engine/6000.3/script-reference/unityengine/particlesystem/shapemodule/shapetype.md).