A virtual reality (VR) or augmented reality (AR) system detects through a camera when a user's hand positions match a predefined position and in response thereto renders an overlay including a crown with which the user can interact to lock onto an object or scene. The system then detects and renders a centre indicator of the crown, tracking the user's hands, enables or disables actions depending on the position of the centre indicator relative to a neutral zone, responds to user hand movement to implement actions, and also detects unlock of the object or scene.