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# SCNParticleModifierStage

Stages of SceneKit’s particle simulation process into which you can insert modifier blocks, used by the [`addModifier(forProperties:at:modifier:)`](/documentation/SceneKit/SCNParticleSystem/addModifier(forProperties:at:modifier:)) method.

```
enum SCNParticleModifierStage
```

## Topics

### Constants

[`SCNParticleModifierStagePreDynamics`](/documentation/SceneKit/SCNParticleModifierStage/preDynamics)

The stage before SceneKit simulates the motion of particles.

[`SCNParticleModifierStagePostDynamics`](/documentation/SceneKit/SCNParticleModifierStage/postDynamics)

The stage after SceneKit simulates the motion of particles.

[`SCNParticleModifierStagePreCollision`](/documentation/SceneKit/SCNParticleModifierStage/preCollision)

The stage before SceneKit simulates the results of collisions between particles and scene geometry.

[`SCNParticleModifierStagePostCollision`](/documentation/SceneKit/SCNParticleModifierStage/postCollision)

The stage after SceneKit simulates the results of collisions between particles and scene geometry.

## Relationships

### Conforms To

[`BitwiseCopyable`](/documentation/Swift/BitwiseCopyable)

[`SendableMetatype`](/documentation/Swift/SendableMetatype)

[`Sendable`](/documentation/Swift/Sendable)

[`RawRepresentable`](/documentation/Swift/RawRepresentable)

[`Hashable`](/documentation/Swift/Hashable)

[`Equatable`](/documentation/Swift/Equatable)

---

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