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Spline

The Spline tool allows you to create organic sketches in space or on other objects.
A spline is drawn from at least 3 interpolated points. The connected geometry is simplified creating a smooth and organic curve between the specified points. Like other drawing tools, splines can be drawn in 3D by snapping to 3D points while drawing.
To specify a distance, start typing a dimension value, and hit OK or press Enter in the Edit Dimension dialog.
Splines can also close on themselves creating a face.