# AnimationTimingFunction The pacing of an animation transition. ``` struct AnimationTimingFunction ``` ## Overview Use an animation timing function to control the pace of an animation transition when you call one of an entity’s animated move methods, like `Entity/move(to:relativeTo:duration:timingFunction:)-905k`. If you omit a timing function from the call, the method uses the [`default`](/documentation/RealityKit/AnimationTimingFunction/default) timing function. ## Topics ### Creating timing functions [`default`](/documentation/RealityKit/AnimationTimingFunction/default) A timing function that produces the default curve for the transition. [`easeIn`](/documentation/RealityKit/AnimationTimingFunction/easeIn) A timing function that produces a gradual starting transition. [`easeInOut`](/documentation/RealityKit/AnimationTimingFunction/easeInOut) A timing function that produces a gradual starting and ending transition. [`easeOut`](/documentation/RealityKit/AnimationTimingFunction/easeOut) A timing function that produces a gradual ending transition. [`linear`](/documentation/RealityKit/AnimationTimingFunction/linear) A timing function that produces a linear transition. [`cubicBezier(controlPoint1:controlPoint2:)`](/documentation/RealityKit/AnimationTimingFunction/cubicBezier(controlPoint1:controlPoint2:)) Creates a timing function that accelerates and then decelerates towards the target value with the cubic bezier shape specified by two control points. ### Comparing timing functions --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)