Enhanced Input setup: add mapping context and bind actions in UE5

SETUP (once per project): 1. Create Input Mapping Context (IMC_Default) in content browser. 2. Create Input Actions (IA_Move, IA_Jump, IA_Look) — set Value Type. 3. In IMC_Default, map keys to each IA. IN CHARACTER EventBeginPlay: GetController → CastTo<PlayerController> → GetSubsystem(UEnhancedInputLocalPlayerSubsystem) → AddMappingContext(IMC_Default, Priority=0). IN EVENT GRAPH: Right-click → search IA_Move → 'IA_Move (EnhancedInputAction)' node appears with Triggered/Started/Completed exec outputs and 'Action Value' data output. For 2D movement: IA_Move → GetAxis2D(ActionValue) → X to AddMovementInput(GetActorRightVector, ScaleValue=X), Y to AddMovementInput(GetActorForwardVector, ScaleValue=Y).

Enhanced Input system setup with Input Actions and Mapping Context

Setup: Create InputAction assets (IA_Move Axis2D, IA_Jump Digital). Create InputMappingContext (IMC_Default) mapping keys to IAs. BeginPlay: GetPlayerController → GetEnhancedInputLocalPlayerSubsystem → AddMappingContext(IMC_Default, 0). Bind: EnhancedInputAction IA_Move → Triggered pin → ActionValue → BreakVector2D → AddMovementInput.

BeginPlay

Fires once on actor spawn (after construction). Use for setup that needs other actors in the world to exist.

Power — raise base to exponent power

Internal function name is MultiplyMultiply_FloatFloat (operator **).

Create widget and add to viewport for HUD

Pattern: BeginPlay → CreateWidget(WidgetClass, GetPlayerController(0)) → store as variable → AddToViewport(Widget, ZOrder=0). Remove: RemoveFromParent(Widget). Toggle: SetVisibility(Collapsed/Visible). Create once, toggle visibility — never recreate every frame. For interaction: SetInputModeUIOnly + SetShowMouseCursor.

SetWorldLocation on component — set component world position

K2_SetWorldLocation. USceneComponent method.

Create widget, add to viewport, and store reference

Pattern: EventBeginPlay → CreateWidget(OwningPlayer=GetPlayerController, WidgetType=WBP_MyWidget) → SetVariable(HUDWidget=ReturnValue) → CastTo<WBP_MyWidget>(HUDWidget) → Cast Succeeded → AddToViewport(ZOrder=0). Always store widget reference in a variable. CreateWidget inputs: 'OwningPlayer' (PlayerController) and 'WidgetType' (class). Exec in='execute', exec out='then'.

Create a Blueprint for a car turntable that auto-rotates and allows mouse drag to manually rotate the car

SpawnSystemAtLocation — spawn Niagara particle system at location

UNiagaraFunctionLibrary::SpawnSystemAtLocation.

SetSimulatePhysics — enable or disable physics simulation on component

UPrimitiveComponent method. Target must have collision.