Edit an Edge
Move, lengthen, or shorten an edge to modify the shape of a PolyNURBS object.
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Click Edit, or double-click a PolyNURBS object to enter
editing mode.
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Choose from the following options:
To Do this Note Move an edge freely Drag the edge. Move a selected edge within a plane When you select an edge, arrows appear at the center of the edge. Lengthen or shorten a selected edge When you select an edge, arrows appear at both ends of the edge. Hold down Ctrl while dragging to lengthen or shorten both ends of the edge symmetrically.