---
title: SCNSceneExportProgressHandler
framework: scenekit
role: symbol
role_heading: Type Alias
path: scenekit/scnsceneexportprogresshandler
---

# SCNSceneExportProgressHandler

The signature for the block that SceneKit calls during scene export.

## Declaration

```swift
typealias SCNSceneExportProgressHandler = (Float, (any Error)?, UnsafeMutablePointer<ObjCBool>) -> Void
```

## Discussion

Discussion You specify a block with this signature when calling the write(to:options:delegate:progressHandler:) method in order to receive updates on the progress of the export operation. The block takes the following parameters:

## See Also

### Constants

- [Scene Attributes](scenekit/scene-attributes.md)
- [Scene Export Options](scenekit/scene-export-options.md)