2D Closed
Use this function to create a closed 2D cubic parametric spline, which lies within a plane and with specified node locations and tangencies at its end points. When creating a 2D-closed spline, keep the following in mind:
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The 2D cubic parametric spline, which appears as an unbroken loop, starts and ends at the first position selected.
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The slope and curvature are continuous at all points on the spline.
Using the Function:
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Click Create>Spline>2D Closed.
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Indicate a series of node points for the new spline.
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Click ACCEPT/OK when you complete positioning nodes.
The figure below is an example of a spline created with the 2D Closed function. The points shown were selected in a clockwise direction from the start point.