---
title: USDPreviewSession.Event
framework: spatialpreview
role: symbol
role_heading: Enumeration
path: spatialpreview/usdpreviewsession/event
---

# USDPreviewSession.Event

Events emitted during a USD preview session

## Declaration

```swift
enum Event
```

## Topics

### Enumeration Cases

- [USDPreviewSession.Event.error(_:)](spatialpreview/usdpreviewsession/event/error(_:).md)
- [USDPreviewSession.Event.playbackStateChanged(isPlaying:)](spatialpreview/usdpreviewsession/event/playbackstatechanged(isplaying:).md)
- [USDPreviewSession.Event.timeChanged(_:)](spatialpreview/usdpreviewsession/event/timechanged(_:).md)

## Relationships

### Conforms To

- [Sendable](swift/sendable.md)
- [SendableMetatype](swift/sendablemetatype.md)

## See Also

### Session state and errors

- [SpatialPreviewSessionState](spatialpreview/spatialpreviewsessionstate.md)
- [SpatialPreviewSessionError](spatialpreview/spatialpreviewsessionerror.md)
- [ConnectedSpatialEndpointObserver.UnavailableError](spatialpreview/connectedspatialendpointobserver/unavailableerror.md)
- [USDPreviewSession.Error](spatialpreview/usdpreviewsession/error.md)