When you select a parametric surface, a Surface Twists dialog box appears for you to select the twist vectors for the surface. The surface will be recalculated with the new twist vectors.
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Surfaces use Twist vectors to describe the curvature within a surface patch. SURFCAM represents surfaces by drawing their patch boundaries (the U and V splines) and the Twist vectors do not affect the patch boundaries. SURFCAM will automatically recommend the correct twist vectors for all methods of surface construction.