Why doesn't my Stateless emitter Spawn Burst trigger conditionally?

Stateless uses BurstList with bool gates per entry. Legacy SpawnRateScale and conditional Spawn Per Second don't apply. Configure list with bool flags.

Array of bursts; each has Time, Count, Bool gate. Stateless evaluates gates each tick. Use User parameter bool to drive.

Per-particle conditional?

Stateless particles can't carry per-particle state. Conditional spawning at system level only.

Fix: Niagara Stateless Emitter Spawn Burst Conditional

Quick answer: Stateless: BurstList with bool gates. Drive gate via User parameter from BP.

Stateless emitter should burst only when gate is true. SpawnRateScale ignored.

The Fix

Stateless Emitter:
  User Parameter:    User.bShouldBurst (Bool)
  Spawn Stage:
    BurstList:
      [0] Time: 0, Count: 20, Gate: User.bShouldBurst

BP:
  Set Niagara Variable Bool(NiagaraComp, "User.bShouldBurst", true)
  Niagara System: Activate(true)

Bool gate drives the burst. Set true and Activate triggers; false stays silent.

Verifying

Set bool true: 20 particles burst. False: nothing.

“BurstList + bool gate. Conditional.”

Related Issues

For Stateless spawn rate, see spawn rate. For NDC fixed emitter, see NDC fixed.

Bool gate. Burst conditional.