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# inputScale

A factor for multiplying the input value of the controller’s animation.

```
var inputScale: CGFloat { get set }
```

## Discussion

Use this property and the [`inputBias`](/documentation/SceneKit/SCNParticlePropertyController/inputBias) property to pre-process input values to the controller’s animation. For example, you use the [`SCNParticleInputMode.overDistance`](/documentation/SceneKit/SCNParticleInputMode/overDistance) option to animate a particle’s opacity as a function of its distance from a specified point, a scale specifies the range of distances over which the animation takes effect.

The default value is `1.0`, leaving the input value to the animation unchanged. The range of possible values depends on the controller’s animation.

---

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