Smooth camera follow with spring arm using RInterpTo

Pattern in PlayerController or Character: EventTick → GetControlRotation → RInterpTo(Current=CurrentCameraRot, Target=ControlRotation, DeltaTime=DeltaSeconds, InterpSpeed=10.0) → SetControlRotation(NewRotation=InterpResult). OR: use SpringArmComponent with CameraLagSpeed and bEnableCameraLag=true for physics-based follow. RInterpTo: 'Current' and 'Target' are Rotators. DeltaTime from Tick's 'DeltaSeconds' output.