---
title: emissionDirection
framework: realitykit
role: symbol
role_heading: Instance Property
path: realitykit/particleemittercomponent/emissiondirection
---

# emissionDirection

The direction particles are emitted when birthDirection is set to World or Local. Defaults to (0.0, 1.0, 0.0).

## Declaration

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