---
title: "simd_act(_:_:)"
framework: simd
role: symbol
role_heading: Function
path: "simd/simd_act(_:_:)-17i5z"
---

# simd_act(_:_:)

## Declaration

```swift
func simd_act(_ q: simd_quath, _ v: simd_half3) -> simd_half3
```

## Discussion

Discussion Rotates the vector v by the quaternion q.