---
title: attenuationFalloffExponent
framework: scenekit
role: symbol
role_heading: Instance Property
path: scenekit/scnlight/attenuationfalloffexponent
---

# attenuationFalloffExponent

The transition curve for the light’s intensity between its attenuation start and end distances. Animatable.

## Declaration

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

## Discussion

Discussion You can apply attenuation to omnidirectional lights and spotlights, causing their intensity to diminish over a specified range of distances. At distances in between the start and end distance, the light’s intensity transitions from full to no illumination according to the value of this property. A value of 0.0 specifies no attenuation—the light’s intensity is the same at all distances. A value of 1.0 specifies a linear transition, and a value of 2.0 (the default) specifies a quadratic transition curve. Higher values have little visible effect. You can animate changes to this property’s value. See Animating SceneKit Content.

## See Also

### Managing Light Attenuation

- [attenuationStartDistance](scenekit/scnlight/attenuationstartdistance.md)
- [attenuationEndDistance](scenekit/scnlight/attenuationenddistance.md)