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Genetic algorithm in removing local NURBS surface irregularities using highlight lines

Highlight lines are well known surface smoothness evaluation tools. This paper explains a method with which the designer is enabled to smooth surfaces, by adjusting its highlight lines. The adjustment of highlight lines is performed by replacing the defective parts with replacement curves of designer's will. The modified control points of the surface, which produces the desired replacement curves, are determined using a genetic algorithm. The method's advantages are represented by using better replacement curves and an algorithm which, no matter how complex the replacement curve is, can find modified control points in the absence of algebraic relations.