Lifetime by Emitter Speed

This module controls the initial lifetime of each particle based on the speed of the emitter when the particle spawns. It multiplies the start lifetime of particles by a value that depends on the speed of the object that spawned them. For most Particle SystemsA component that simulates fluid entities such as liquids, clouds and flames by generating and animating large numbers of small 2D images in the scene. More info
See in Glossary, this is the GameObjectThe fundamental object in Unity scenes, which can represent characters, props, scenery, cameras, waypoints, and more. A GameObject’s functionality is defined by the Components attached to it. More info
See in Glossary velocity, but for sub-emitters, the velocity comes from the parent particle that the sub-emitter particle originated from.

Properties

Property	Function
Multiplier	The multiplier to apply to the particle’s initial lifetime. The module uses this value differently depending on the curve mode you set. The curve modes are: • Constant: Uses the constant multiplier value you set for this property. Using this curve mode ignores the Speed Range property. • Curve: Takes the emitter’s speed, maps it to a value between 0 and 1 based on the Speed Range, then uses the normalized value to sample the curve. • Random Between Two Constants: Sets a random multiplier for each particle between the two values you set for this property. Using this curve mode ignores the Speed Range property. • Random Between Two Curves: Takes the emitter’s speed, maps it to a value between 0 and 1 based on the Speed Range, then uses the normalized value to sample each curve. For each particle, the module sets the multiplier to a random value between the two samples.
Speed Range	The minimum and maximum emitter speeds the Particle System maps to a value along the Multiplier curve. If the emitter’s speed is equal to the first value, the multiplier is the value at the start of the curve. If the emitter’s speed is equal to the second value, the multiplier is the value at the end of the curve. This property is only relevant if the curve mode for Multiplier is set to Curve or Random Between Two Curves.

Property

Function

Multiplier

The multiplier to apply to the particle’s initial lifetime. The module uses this value differently depending on the curve mode you set. The curve modes are:
• Constant: Uses the constant multiplier value you set for this property. Using this curve mode ignores the Speed Range property.
• Curve: Takes the emitter’s speed, maps it to a value between 0 and 1 based on the Speed Range, then uses the normalized value to sample the curve.
• Random Between Two Constants: Sets a random multiplier for each particle between the two values you set for this property. Using this curve mode ignores the Speed Range property.
• Random Between Two Curves: Takes the emitter’s speed, maps it to a value between 0 and 1 based on the Speed Range, then uses the normalized value to sample each curve. For each particle, the module sets the multiplier to a random value between the two samples.

Speed Range

The minimum and maximum emitter speeds the Particle System maps to a value along the Multiplier curve. If the emitter’s speed is equal to the first value, the multiplier is the value at the start of the curve. If the emitter’s speed is equal to the second value, the multiplier is the value at the end of the curve.
This property is only relevant if the curve mode for Multiplier is set to Curve or Random Between Two Curves.

Inherit Velocity module

Force Over Lifetime module

Unity Manual

Lifetime by Emitter Speed

Properties