Class A surfaces are external surfaces of industrial objects, to which aesthetic appeal is attributed. Their design involves beyond functional criteria also subjective ones related to style and appearance. The design criteria include appropriate highlight line structures of the surfaces. Correction of highlight lines is usually performed interactively by the designer, which is time consuming, tedious and inaccurate.In the current paper an algorithmic method is suggested to automatically improve the quality of the highlight line structure. Application of the method is demonstrated by the correction of highlight line structure of industrial surfaces.