The returned value sets what the property will be at the START of the particle's life, on emit.
| name | type | arguments | description |
|---|---|---|---|
| particle | Phaser.GameObjects.Particles.Particle | <optional> |
The particle. |
| key | string | <optional> |
The name of the property. |
| value | number | <optional> |
The current value of the property. |
The new value of the property.