# PlaybackRenderer

Source: https://www.nianticspatial.com/docs/api/swift/NSDK.class-PlaybackRenderer/

PlaybackRenderer

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## Declaration

@MainActor class PlaybackRenderer

## Summary

Renders each playback frame: (1) draws the recorded camera image as the background, (2) **moves the
RealityKit camera** (pose + FOV) to match the playback frame. **PlaybackSession** holds an optional
reference and calls `renderFrame(_:)` on the main queue for every new frame.
Relation to Apple AR: **Manipulates** RealityKit--sets `arView.environment.background = .color(.clear)`,
adds a **PerspectiveCamera** and **AnchorEntity**, and updates their transform and `fieldOfViewInDegrees`
every frame from PlaybackCamera. In playback, ARView's default camera is off; we drive the virtual camera.

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## Constructors

@MainActor init(in view: UIView, arView: ARView)

#### Summary

Creates the renderer: a background view (camera image) in the given container and a RealityKit camera in the ARView.
The ARView's environment background is set to clear so the playback image is visible behind RealityKit content.

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## Methods

| Name | Type | Summary |
| --- | --- | --- |
| @MainActor renderFrame | void | Called on the main queue for each new playback frame. Updates the background image and the virtual camera pose/FOV to match the frame. |

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## Relationships

conforms to:  Swift.Sendable