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# exposureDuration

A value you use to effect motion blur when rendering your app’s virtual content.

```
var exposureDuration: TimeInterval { get }
```

## Discussion

If you display an AR experience using a custom Metal renderer, use this value to determine how much motion blur to apply to your virtual content.

If [`ARSCNView`](/documentation/ARKit/ARSCNView) is your renderer, SceneKit automatically applies motion blur to your virtual content. For more information, see [`rendersMotionBlur`](/documentation/ARKit/ARSCNView/rendersMotionBlur).

![Screenshot showing the before and after case of virtual content rendering with motion blur.](images/com.apple.arkit/media-3231008@2x.png)

---

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