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# Emitter Modes

These constants specify the possible emitter modes. They are used by the [`emitterMode`](/documentation/QuartzCore/CAEmitterLayer/emitterMode) property.

## Topics

### Constants

[`points`](/documentation/QuartzCore/CAEmitterLayerEmitterMode/points)

Particles are emitted from points on the particle emitter.

[`outline`](/documentation/QuartzCore/CAEmitterLayerEmitterMode/outline)

Particles are emitted from the outline of the particle emitter.

[`surface`](/documentation/QuartzCore/CAEmitterLayerEmitterMode/surface)

Particles are emitted from the surface of the particle emitter.

[`volume`](/documentation/QuartzCore/CAEmitterLayerEmitterMode/volume)

Particles are emitted from the a position within the particle emitter.


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