This plugin creates a spiral curve on the surface of a sphere. Like the 2D Archimedean spiral, the windings are all an equal distance apart.
Download Spherical Spiral 1.0
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This plugin is accessed from the Draw menu (Draw > Spherical Spiral). This will open a dialog box to enter the parameter values.
The more edges per revolution, the smoother the curve.
When you click OK, the spherical spiral is created as a component, and the component placement tool is activated to position it in the model.
The dialog box remembers the values between SketchUp sessions.