the present invention relates to a method of shaping a glass sheet in one dimension , by roll forming in a manner to selectively minimize / eliminate undesired curvature from the glass sheet . such shaping is achieved by the selective location in first and second , shaping zones , of shaping rolls having first and second shaping configurations and , optionally , by varying the velocity of the glass sheet as it moves through the shaping zones , thus varying the time portions of the glass sheet are in contact with certain shaping rolls .