# SpeedByLife Module
# Overview
SpeedByLife (speed change module), used to set the speed change in the life cycle of the particle.
If the attribute type is Curve or TwoCurves, you can click on the curve and drag the Particle Curve at the bottom of the inspector upwards, and the curve editor will appear. You can right-click to increase the key frame and adjust the curve change.
# Property description
| Property | Function | Type |
|---|---|---|
| x | Speed on the X axis. | engine.Particle.AdvancedProperty.ConstantProperty engine.Particle.AdvancedProperty.TwoConstantsProperty engine.Particle.AdvancedProperty.CurveProperty engine.Particle.AdvancedProperty.TwoCurvesProperty |
| y | The speed on the Y axis. | engine.Particle.AdvancedProperty.ConstantProperty engine.Particle.AdvancedProperty.TwoConstantsProperty engine.Particle.AdvancedProperty.CurveProperty engine.Particle.AdvancedProperty.TwoCurvesProperty |
| z | Speed on the Z axis. | engine.Particle.AdvancedProperty.ConstantProperty engine.Particle.AdvancedProperty.TwoConstantsProperty engine.Particle.AdvancedProperty.CurveProperty engine.Particle.AdvancedProperty.TwoCurvesProperty |