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Creates a curve by selecting its control points, similar to the related 2D function (see Splines and Bezier Curves), but you can place line segments anywhere in 3D space. The curve passes through the points (unlike a spline, which uses control points as a guide).

1. Select the control points in the desired order.
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2. After selecting the last point, select Finish from the local menu or press Alt+F. You can also double-click the last point.
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3. If you want to close the spline, choose Close from the local menu instead of Finish. In this case, the spline will no longer touch the first and last control points.
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   Once created, you can use the Edit Tool to change the shape of a spline and add knots. See Editing Splines and Bezier Curves.