Particle Lifetime is a technical term that is extremely important in game graphics rendering and optimization (technical art). An explanation of the most basic property of effect control, which defines the lifetime (in seconds) of each individual particle from its creation to its disappearance.
Real-world analogy: Sparkler's ``time limit (lifespan) until the gunpowder burns out''
Particle Lifetime is ``the ``heart timer (survival limit number of seconds)'' of each spark released''. A timer (e.g. 2.5 seconds) starts the moment it occurs and counts down every second. While this timer is running, the particles fly around in space, change color, and shrink in size, but at the moment the timer reaches 0, the particles reach the end of their lifespan and disappear from the screen (despawn), and are also released from GPU memory. Depending on the length of this lifespan, the sharpness of the explosion and the feeling of lingering fog are produced.
Figure: Infographic that clearly illustrates the basic processing flow and mechanism of Particle Lifetime in Japanese.
Detailed mechanism and operating principle
Set an appropriate constant or random range (Random Between Two Constants) to the Lifetime property of Particle System or VFX Graph to appropriately control the number of seconds a particle lives.