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Redesigning objects with free form surfaces

In most of the graphics and design systems shape modification of free form surfaces is based on control point adjustment. Although this technique may work well, it is not sufficiently intuitive for a creative designer. Maintaining shape and design constraints can also be difficult. We propose a technique which is suitable to intuitively modify the shape of a parametric B-spline surface by embedding a predefined characteristic curve. Shape modification is performed by using a genetic algorithm. Maintaining smoothness of the resulting surface is discussed and experimental results are presented.