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VfxLifetimeStateBehavior

15.23 Interface

Inheritance 3 descendants

Class Documentation

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The state machine of a VfxLifetimeComponent, stored in its LifetimeBehavior slot. It moves the emitter through its phases, decides when emission is on, gives each new particle its lifetime and decides when the emitter is finished.

Phases

Phase What happens Ends when
Start delay No emission. startDelay seconds have passed. A delay of 0 or less skips the phase.
Emitting The spawn behaviour emits, see VfxSpawnBehavior. EmitterDuration seconds have passed.
Loop delay No emission. The next emitting phase follows. Only LoopingIntroOutro has this phase. LoopDelay seconds have passed.
Outro No emission. The live particles keep updating and expire by their own lifetime. OutroDuration seconds have passed, or no particle is alive.
Finished The emitter is done. -

The emitting phase is the only phase in which the emitter spawns particles.

Evaluation. startDelay, EmitterDuration and LoopDelay are evaluated once, when the emitter is created. OutroDuration is evaluated when the outro starts. particleLifetime is evaluated once for each new particle. Each value is a driver value in seconds.

Carry-over time. The state machine advances once per simulation step, before the emitter updates. When a phase ends inside a step, the rest of that step is carried into the next phase, so phase lengths do not round to the step length. A phase that is not longer than the carried time ends in the same step, and the machine moves on to the phase after it. The step that ends the emitting phase still spawns particles for the part of the step that was inside the phase.

Finished. The emitter counts as finished when the outro has ended, or during the outro when no particle is alive. While the emitter is finished, the client removes every remaining particle in one pass. OutroDuration is therefore the longest time that particles outlive emission. It is not a fade. With an OutroDuration of 0, every particle is removed in the step in which emission ends.

Stopping. When the particle system is stopped, an emitter in its start delay, emitting or loop delay phase enters the outro at once.

Particle lifetime. A particle is removed when its age reaches the lifetime that it received at spawn. A negative lifetime means the particle never expires; it is removed only when the emitter is finished.

Intro. The behaviours with an IntroDuration also track an intro, see that property. The intro does not delay or gate emission.

Referenced by 1 class · 1 property