---
title: "slerp(from:to:t:along:)"
framework: Spatial
role: symbol
role_heading: Type Method
platforms: [iOS 17.0+, iPadOS 17.0+, Mac Catalyst, macOS 14.0+, tvOS 17.0+, visionOS, watchOS 10.0+]
path: spatial/rotation3d/4157007-slerp
---

# slerp(from:to:t:along:)

Returns the spherical linear interpolation along either the shortest or the longest arc between two rotations.

## Declaration

```swift
static func slerp(from: Rotation3D, to: Rotation3D, t: Double, along path: Rotation3D.SlerpPath = .shortest) -> Rotation3D
```

## Parameters

- `from`: The starting rotation.
- `to`: The ending rotation.
- `t`: The position along the interpolation that’s between `0` and `1`.
- `path`: An enumeration that specifies whether the interpolation should be along the shortest or the longest path between the two rotations.

## Return Value

A new rotation. When `t = 0.0`, the result is the `from` rotation. When `t = 1.0`, the result is the `to` rotation. For any other value of `t`, the result is a spherical linear interpolation between the two rotations.

## See Also

### Transforming a 3D rotation structure

- [Rotation3D.SlerpPath](slerppath.md)
- [inverse](inverse.md)
- [identity](identity.md)