---
title: "init(duration:timingFunction:)"
framework: realitykit
role: symbol
role_heading: Initializer
path: "realitykit/billboardaction/transition/init(duration:timingfunction:)"
---

# init(duration:timingFunction:)

Creates a transition with a duration and timing function.

## Declaration

```swift
init(duration: TimeInterval = 0, timingFunction: AnimationTimingFunction = .default)
```