---
title: emissionAngleRange
framework: spritekit
role: symbol
role_heading: Instance Property
path: spritekit/skemitternode/emissionanglerange
---

# emissionAngleRange

The range of allowed random values for a particle’s initial direction, expressed as an angle in radians.

## Declaration

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

## Discussion

Discussion The default value is 0.0. If non-zero, the emission angle of each particle is randomly determined and may vary by plus or minus half of the range value.

## See Also

### Controlling Particle Velocity and Acceleration

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