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# SCNParticleOrientationMode.billboardYAligned

The y-axis direction of each particle is always fixed with respect to the point of view camera.

```
case billboardYAligned
```

## Discussion

Use this mode to allow each particle to rotate freely about its y-axis (as determined by the [`particleAngle`](/documentation/SceneKit/SCNParticleSystem/particleAngle) and [`particleAngularVelocity`](/documentation/SceneKit/SCNParticleSystem/particleAngularVelocity) properties or the [`angle`](/documentation/SceneKit/SCNParticleSystem/ParticleProperty/angle) key), but prevent it from rotating around any other axis.

---

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