Mouse click to world: detect clicked actor or ground position

On Left Mouse Button pressed → GetHitResultUnderCursorByChannel(TraceChannel=Visibility) → Branch(ReturnValue=true) → BreakHitResult → Check HitActor: IsValid(HitActor) → Branch → True: interact with HitActor. Check ground: use ImpactPoint as the world position clicked. GetHitResultUnderCursorByChannel is on PlayerController. Inputs: 'TraceChannel' (ETraceTypeQuery) and 'bTraceComplex' (bool). Output: 'HitResult' (struct) and 'ReturnValue' (bool). Use BreakHitResult to get ImpactPoint, HitActor, etc.

GetMousePosition — get current mouse screen position

PlayerController

Routes human input to the possessed Pawn. Owns mouse cursor, viewport access, and input mapping.

Smooth zoom with mouse wheel on spring arm camera

Pattern: Variables TargetArmLength(float), MinZoom(float)=200, MaxZoom(float)=2000, ZoomStep(float)=50, ZoomSpeed(float)=5. InputAxis MouseWheel: TargetArmLength = FClamp(TargetArmLength - AxisValue*ZoomStep, MinZoom, MaxZoom). Tick: SpringArm.TargetArmLength = FInterpTo(Current, TargetArmLength, DeltaSeconds, ZoomSpeed). FInterpTo provides smooth easing.

SetShowMouseCursor — show or hide the mouse cursor

SetShowMouseCursor — show or hide the mouse cursor

APlayerController property. Usually paired with SetInputModeUIOnly.

GetHitResultUnderCursorByChannel — trace under mouse cursor

APlayerController method. Great for click-to-interact games.

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

string

string

WASD character movement using AddMovementInput with input axis events

Pattern: InputAxis MoveForward → Multiply_FloatFloat(A=AxisValue, B=1.0) → AddMovementInput(WorldDirection=GetActorForwardVector, ScaleValue=Product). Repeat for MoveRight with GetActorRightVector. Key pins: AddMovementInput inputs: 'WorldDirection' (Vector) and 'ScaleValue' (float). Input Axis event output pin is named 'Axis Value' (float).