Countdown timer with UI update using SetTimerByFunctionName

Pattern: Variables: TimeRemaining (float), TimerHandle (TimerHandle). Start: EventBeginPlay → SetTimerByFunctionName(Object=self, FunctionName='OnTick', Time=1.0, bLooping=true). OnTick custom function: Subtract_FloatFloat(A=TimeRemaining, B=1.0) → SetVariable(TimeRemaining) → Branch(TimeRemaining <= 0) → True: ClearAndInvalidateTimerByHandle(Handle=TimerHandle) → OnTimerExpired. UI: GetHUD → CastTo<WBP_HUD> → SetTimerText(Conv_FloatToString(TimeRemaining)). Key: SetTimerByFunctionName output 'ReturnValue' is TimerHandle — save it to clear later.

Delay — wait for Duration seconds then continue

Exec output is 'Completed' (NOT 'then'). Does not block — execution continues after Delay node fires.

DoN — execute N times then stop

SetTimerByEvent — set timer that fires a custom event delegate

K2_SetTimerDelegate. Safer than FunctionName version. Create delegate from custom event.

RetriggerableDelay — delay that resets if triggered again

UKismetSystemLibrary::RetriggerableDelay. Latent.

StopMontage — stop a currently playing AnimMontage

Elevator or moving platform with timeline and trigger

Pattern: Variables StartLocation(Vector), EndLocation(Vector). BeginPlay: SET StartLocation=GetActorLocation. Timeline MoveTimeline(Alpha 0→1 over Duration). Trigger overlap/button press → Play Timeline. Timeline Update: VLerp(StartLocation, EndLocation, Alpha) → SetActorLocation(Self, Result, bSweep=true). Finished: Delay → Reverse Timeline.

SetTimerByFunctionName — set timer that calls a function

K2_SetTimer. Prefer SetTimerByEvent for type safety.

Event Tick — fires every frame with DeltaSeconds

Respawn system: death → delay → respawn at PlayerStart

In Character BP: OnDied (custom event) → SetActorHiddenInGame(true) → SetActorEnableCollision(false) → Disable input: GetController → DisableInput → Delay(Duration=3.0) → GetGameMode → CastTo<BP_GameMode> → RestartPlayer(GetController) → SetActorHiddenInGame(false) → SetActorEnableCollision(true) → EnableInput. In GameMode RestartPlayer: Gets nearest PlayerStart → SetActorLocation to PlayerStart → calls OnPossess. OR manual: GetAllActorsOfClass(PlayerStart) → Random select → SetActorLocationAndRotation(PlayerStart.Location, PlayerStart.Rotation).