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# playUsingSceneTimeBase

Animations loaded from the scene file are immediately added to the scene and played according to the scene’s [`sceneTime`](/documentation/SceneKit/SCNSceneRenderer/sceneTime) property.

```
static let playUsingSceneTimeBase: SCNSceneSource.AnimationImportPolicy
```

## Discussion

Using this policy is equivalent to manually loading each animation, setting its <doc://com.apple.documentation/documentation/QuartzCore/CAAnimation/usesSceneTimeBase> property to <doc://com.apple.documentation/documentation/Swift/true>, and adding it to the appropriate element of the scene. Use this policy when you want to directly control (or let the user directly control) the progress of animations.

---

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