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# SCNSceneSource.LoadingOption

Options for creating scene sources and loading the scenes they contain.

```
struct LoadingOption
```

## Topics

### Type Properties

[`animationImportPolicy`](/documentation/SceneKit/SCNSceneSource/LoadingOption/animationImportPolicy)

An option for controlling the playback of animations in a scene file.

[`SCNSceneSource.AnimationImportPolicy`](/documentation/SceneKit/SCNSceneSource/AnimationImportPolicy)

Options for playing animations loaded from a scene file, used with the [`animationImportPolicy`](/documentation/SceneKit/SCNSceneSource/LoadingOption/animationImportPolicy) key in options dictionaries.

[`assetDirectoryURLs`](/documentation/SceneKit/SCNSceneSource/LoadingOption/assetDirectoryURLs)

Locations to use for resolving relative URLs to external resources.

[`checkConsistency`](/documentation/SceneKit/SCNSceneSource/LoadingOption/checkConsistency)

An option to validate scene files while loading.

[`convertToYUp`](/documentation/SceneKit/SCNSceneSource/LoadingOption/convertToYUp)

An option for whether to transform assets loaded from the scene file for use in a coordinate system where the y-axis points up.

[`convertUnitsToMeters`](/documentation/SceneKit/SCNSceneSource/LoadingOption/convertUnitsToMeters)

An option for whether to automatically scale the scene’s contents.

[`createNormalsIfAbsent`](/documentation/SceneKit/SCNSceneSource/LoadingOption/createNormalsIfAbsent)

An option for automatically generating surface normals if they are absent when loading geometry.

[`flattenScene`](/documentation/SceneKit/SCNSceneSource/LoadingOption/flattenScene)

An option for automatically merging portions of a scene graph during loading.

[`overrideAssetURLs`](/documentation/SceneKit/SCNSceneSource/LoadingOption/overrideAssetURLs)

An option to attempt loading external resources using their URLs as specified in a scene file.

[`preserveOriginalTopology`](/documentation/SceneKit/SCNSceneSource/LoadingOption/preserveOriginalTopology)

[`strictConformance`](/documentation/SceneKit/SCNSceneSource/LoadingOption/strictConformance)

An option to interpret scene files exactly as specified by the scene file format.

[`useSafeMode`](/documentation/SceneKit/SCNSceneSource/LoadingOption/useSafeMode)

An option to limit filesystem and network access for external resources referenced by a scene file.


---

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