---
title: vortexDirection
framework: realitykit
role: symbol
role_heading: Instance Property
path: realitykit/particleemittercomponent/particleemitter/vortexdirection
---

# vortexDirection

Direction vector of the vortex axis. Defaults to (0, 1, 0).

## Declaration

```swift
var vortexDirection: SIMD3<Float>
```