---
title: "init(revolutions:localAxis:timingFunction:isAdditive:)"
framework: realitykit
role: symbol
role_heading: Initializer
path: "realitykit/spinaction/init(revolutions:localaxis:timingfunction:isadditive:)"
---

# init(revolutions:localAxis:timingFunction:isAdditive:)

Creates a new spin action.

## Declaration

```swift
init(revolutions: Float, localAxis: SIMD3<Float> = [0, 1, 0], timingFunction: AnimationTimingFunction = .default, isAdditive: Bool = false)
```

## Parameters

- `revolutions`: The number of rotations to complete before stopping.
- `localAxis`: A vector that describes the axis of rotation (in local space).
- `timingFunction`: A timing function that controls the progress of the animation.
- `isAdditive`: A Boolean value that indicates whether the animation system additively blends the action’s output with the base value.