---
title: SCNLightAttenuationStartKey
framework: scenekit
role: symbol
role_heading: Global Variable
path: scenekit/scnlightattenuationstartkey
---

# SCNLightAttenuationStartKey

The distance from the light at which its intensity begins to diminish.

## Declaration

```swift
let SCNLightAttenuationStartKey: String
```

## See Also

### Constants

- [SCNLightAttenuationEndKey](scenekit/scnlightattenuationendkey.md)
- [SCNLightAttenuationFalloffExponentKey](scenekit/scnlightattenuationfalloffexponentkey.md)
- [SCNLightSpotInnerAngleKey](scenekit/scnlightspotinneranglekey.md)
- [SCNLightSpotOuterAngleKey](scenekit/scnlightspotouteranglekey.md)
- [SCNLightShadowFarClippingKey](scenekit/scnlightshadowfarclippingkey.md)
- [SCNLightShadowNearClippingKey](scenekit/scnlightshadownearclippingkey.md)