---
title: SCNSceneSourceAssetUnitMeterKey
framework: scenekit
role: symbol
role_heading: Global Variable
path: scenekit/scnscenesourceassetunitmeterkey
---

# SCNSceneSourceAssetUnitMeterKey

The conversion factor from the unit used in the scene file to the SI meter.

## Declaration

```swift
let SCNSceneSourceAssetUnitMeterKey: String
```

## Discussion

Discussion The value for this key is an NSNumber object whose floating-point value is the number of SI meters for each unit in the scene file.

## See Also

### Constants

- [SCNSceneSourceAssetUnitNameKey](scenekit/scnscenesourceassetunitnamekey.md)