---
title: inputBias
framework: scenekit
role: symbol
role_heading: Instance Property
path: scenekit/scnparticlepropertycontroller/inputbias
---

# inputBias

An offset to add to the input value of the controller’s animation.

## Declaration

```swift
var inputBias: CGFloat { get set }
```

## Discussion

Discussion Use this property and the inputScale property to pre-process input values to the controller’s animation. For example, if you use the SCNParticleInputMode.overDistance option to animate a particle’s opacity as a function of its distance from a specified point, a bias specifies the minimum distance at which the animation’s fromValue property or first keyframe value takes effect. The default value is 0.0, leaving the input value to the animation unchanged. The range of possible values depends on the controller’s animation.

## See Also

### Managing the Controller’s Animation

- [animation](scenekit/scnparticlepropertycontroller/animation.md)
- [inputMode](scenekit/scnparticlepropertycontroller/inputmode.md)
- [inputScale](scenekit/scnparticlepropertycontroller/inputscale.md)
- [inputOrigin](scenekit/scnparticlepropertycontroller/inputorigin.md)
- [inputProperty](scenekit/scnparticlepropertycontroller/inputproperty.md)