The final appearance of a product plays a crucial role everywhere that panes are positioned automatically. Apart from the shape, stability, colour etc., the final appearance is also dependent on the position of the glass in the frame. The pane must be inserted in as centred a position as possible. A laser scanner also detects automatically for the insertion of the glass whether the gap is the same on all sides or not. If differences occur, the pane can still be moved somewhat. The extremely difficult conditions of the different reflection factors of glass and frame (metal, wood, plastic) do not affect the quality of the measured data.