Replicated

A variable marked to sync from server to clients. RepNotify variants call a function on the client when the value changes.

EnhancedInputAction — Enhanced Input system action event

K2Node_EnhancedInputAction. ActionValue type depends on InputAction (Bool, Float, Axis2D, Axis3D). Triggers: Started, Ongoing, Triggered, Completed, Canceled.

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.

RetriggerableDelay — delay that resets if triggered again

UKismetSystemLibrary::RetriggerableDelay. Latent.

EnableInput — allow this actor to receive input events

Must call EnableInput(GetPlayerController(0)) before BindAction/BindAxis events fire on the actor.

AddImpulse — apply instant impulse to physics body

One-shot force. bVelChange=true treats Impulse as velocity change.

EventAnyDamage — receive any type of damage

SetText (widget) — update Text block content at runtime

Call on a TextBlock widget variable from your Widget BP. Use 'Format Text' or 'Conv_StringToText' to build the Text value.

Widget data binding: update UI automatically when variable changes

METHOD 1 - Function Binding (auto-updates every frame, easy but has perf cost): In Widget BP: select TextBlock → Details → Content → Text → click 'Bind' → Create Binding → connect your data (e.g. GetPlayerHealth as Text). METHOD 2 - Event-driven (recommended, update only when needed): In owning actor: when data changes → CastTo<WBP_HUD>(HUDWidget) → call custom function 'UpdateHealth(NewHealth)' on widget. In Widget BP: UpdateHealth function → SetText(HealthText, Conv_FloatToString(NewHealth)). KEY: Function bindings run every frame. For frequently-changing data (Tick-speed), use Event-driven approach instead to avoid perf issues.

EventHit — fires when actor is hit by or hits something

Requires Simulation Generates Hit Events on physics body.