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Curvature and variation of curvature are the essential factors in determining the fairness of a surface. Unfortunately, most of the traditional surface representation schemes do not provide users with direct manipulation techniques of these quantities. Streamline modeling, a recently proposed free-form surface design methodology, is aimed at overcoming this shortcoming by allowing a user to control...
A new method to scale a trimmed NURBS surface while holding the shape and size of specific features (trimming curves) unchanged is presented. The new method is fix-and-stretch based: the new surface is formed by fixing selected regions of the given trimmed NURBS surface that contain the trimming curves and stretching the remaining part of the surface to reach certain boundary conditions. The stretching...
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