---
title: "GLKQuaternionAxis(_:)"
framework: GLKit
role: symbol
role_heading: Function
platforms: [iOS 5.0+, iPadOS 5.0+, macOS 10.8+, tvOS 9.0+]
path: "glkit/glkquaternionaxis(_:)"
---

# GLKQuaternionAxis(_:)

Returns the axis of rotation of a quaternion.

## Declaration

```swift
func GLKQuaternionAxis(_ quaternion: GLKQuaternion) -> GLKVector3
```

## Parameters

- `quaternion`: A quaternion.

## Return Value

Return Value The axis of rotation.

## See Also

### Retrieving Information About a Quaternion

- [GLKQuaternionLength(_:)](glkit/glkquaternionlength(_:).md)
- [GLKQuaternionAngle(_:)](glkit/glkquaternionangle(_:).md)