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# BillboardAction.Transition

The duration and timing of how an action event transitions from one
state to another.

```
struct Transition
```

## Topics

### Initializers

[`init(duration: TimeInterval, timingFunction: AnimationTimingFunction)`](/documentation/RealityKit/BillboardAction/Transition/init(duration:timingFunction:))

Creates a transition with a duration and timing function.

### Instance Properties

[`var duration: TimeInterval`](/documentation/RealityKit/BillboardAction/Transition/duration)

The amount of time the transition takes to go from one state to another.

[`var timingFunction: AnimationTimingFunction`](/documentation/RealityKit/BillboardAction/Transition/timingFunction)

The rate of change at the beginning and end of the transition.

## Relationships

### Conforms To

[`Decodable`](/documentation/Swift/Decodable)

[`Encodable`](/documentation/Swift/Encodable)

---

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