SetVisibility widget — show or hide widget

ESlateVisibility: Visible, Collapsed, Hidden, HitTestInvisible, SelfHitTestInvisible.

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.

SetVisibility — show or hide a scene component

SetVisibility on component — show or hide a scene component

SetColorAndOpacity — change widget color and transparency

Image

Displays a Texture2D or Material in UMG. Set Brush.Tint to colorize.

SetColorAndOpacity on widget — change widget color and transparency

Line trace from camera to detect what player is looking at

Pattern: GetPlayerController → GetPlayerViewPoint(outputs Location,Rotation) → GetForwardVector(Rotation) → Multiply_VectorFloat(A=Forward, B=TraceDistance) → Add_VectorVector(A=CameraLocation, B=Offset) → LineTraceByChannel(Start=CameraLocation, End=TraceEnd). GetPlayerViewPoint exec in='execute', exec out='then', outputs: 'Location' (Vector) and 'Rotation' (Rotator).

Camera

Defines a viewpoint into the world. The active PlayerController's view comes from one camera at a time.

AddToViewport — add widget to the game viewport

UUserWidget::AddToViewport.