---
title: particleZPositionSpeed
framework: spritekit
role: symbol
role_heading: Instance Property
path: spritekit/skemitternode/particlezpositionspeed
---

# particleZPositionSpeed

The speed at which the particle’s depth changes.

## Declaration

```swift
var particleZPositionSpeed: CGFloat { get set }
```

## Discussion

Discussion The default value is 0.0.

## See Also

### Controlling Particle Velocity and Acceleration

- [particleSpeed](spritekit/skemitternode/particlespeed.md)
- [particleSpeedRange](spritekit/skemitternode/particlespeedrange.md)
- [emissionAngle](spritekit/skemitternode/emissionangle.md)
- [emissionAngleRange](spritekit/skemitternode/emissionanglerange.md)
- [xAcceleration](spritekit/skemitternode/xacceleration.md)
- [yAcceleration](spritekit/skemitternode/yacceleration.md)