---
title: "spline(leftEndpoint:from:to:rightEndpoint:t:)"
framework: spatial
role: symbol
role_heading: Type Method
path: "spatial/rotation3dfloat/spline(leftendpoint:from:to:rightendpoint:t:)"
---

# spline(leftEndpoint:from:to:rightEndpoint:t:)

Returns an interpolated value between two rotations along a spherical cubic spline.

## Declaration

```swift
static func spline(leftEndpoint r0: Rotation3DFloat, from r1: Rotation3DFloat, to r2: Rotation3DFloat, rightEndpoint r3: Rotation3DFloat, t: Float) -> Rotation3DFloat
```

## Return Value

Return Value A new rotation that’s the interpolated value between the two rotations along a spherical cubic spline.

## Discussion

Discussion Use this function to smoothly interpolate between a sequence of rotations.