---
title: usesSceneTimeBase
framework: quartzcore
role: symbol
role_heading: Instance Property
path: quartzcore/caanimation/usesscenetimebase
---

# usesSceneTimeBase

For animations attached to SceneKit objects, a Boolean value that determines whether the animation is evaluated using the scene time or the system time.

## Declaration

```swift
var usesSceneTimeBase: Bool { get set }
```

## Discussion

Discussion If the value of this property is true, animation timing is governed by the currentTime property of the view, layer, or custom renderer responsible for drawing the scene. The default value is false. To attach animations to SceneKit objects, see SCNAnimatable.