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

# size

The rendered size, in units of the scene’s world coordinate space, of the particle image. Value is the half-extent of the particle’s quad. Defaults to 0.02.

## Declaration

```swift
var size: Float
```