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Simple multi-point spline approximating the shape of the catenary curve (the shape formed by a hanging rope). Allows for driving the point positions by scene objects, controlling the slack by absolute sag amount or relative to the length of the line between points, randomization of the slack and other options:
Technically you can probably call it a rounded isosceles trapezoid but it will be more useful as a base for path of bicycle chains or pulley belts. When both radii are the same and spline set to renderable, it could also be used as a simple chain link.
With this useful and funny script, you can isolate in a ListBox, the category object in Geometry, Shape, Light, Helper, Camera and Space Warp in the viewport. We can select, rename and count the items in the scene. Useful in many work situation.