def display(self):
        """
        Add the panels and the badge
        """
        if self.need_interface:
            if self.right_panel:
                self.right_panel.add_display_region(DisplayRegionPosition.right)
            if self.mid_panel:
                self.mid_panel.add_display_region(DisplayRegionPosition.mid)
            if self.left_panel:
                self.left_panel.add_display_region(DisplayRegionPosition.left)

            self.arrow.reparentTo(self.engine.aspect2d)
            self.contact_result_render.reparentTo(self.engine.aspect2d)

        Add the panels and the badge
        
metadrive/engine/interface.py