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# SurroundingsEffect

Effects that the system can apply to passthrough video.

```
struct SurroundingsEffect
```

## Overview

Use one of these values with the [`preferredSurroundingsEffect(_:)`](/documentation/SwiftUI/View/preferredSurroundingsEffect(_:))
view modifier to indicate what effect to apply to
passthrough video when the modified view is displayed.

## Topics

### Getting the effect

[`systemDark`](/documentation/SwiftUI/SurroundingsEffect/systemDark)

An effect that dims passthrough video.


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