---
title: "write(_:withSceneDocumentURL:originalImageURL:)"
framework: scenekit
role: symbol
role_heading: Instance Method
path: "scenekit/scnsceneexportdelegate/write(_:withscenedocumenturl:originalimageurl:)"
---

# write(_:withSceneDocumentURL:originalImageURL:)

Tells the delegate to export an image attached to a scene.

## Declaration

```swift
optional func write(_ image: UIImage, withSceneDocumentURL documentURL: URL, originalImageURL: URL?) -> URL?
```

```swift
optional func write(_ image: NSImage, withSceneDocumentURL documentURL: URL, originalImageURL: URL?) -> URL?
```

## Parameters

- `image`: An image attached to the scene being exported.
- `documentURL`: The URL the scene is being exported to.
- `originalImageURL`: The URL the image was originally loaded from, or nil if the image was not previously loaded from a URL.

## Return Value

Return Value The URL your app exported the image to, or nil if your app did not write the image to a URL.

## Discussion

Discussion If you implement this method, Scene Kit calls it for each image (for example, a texture) attached to the scene. Your app can then save the image data in a location and format of your choice, returning a URL for the exported image file. If you do not provide a delegate when exporting a scene, or if your delegate returns nil from this method, Scene Kit exports the image in a default format to a default location.