FredoSpline is an extension for Sketchup 2017 and above.
It creates various curves based on control points, which can be further edited:
- Bezier and Nurbs
- Fit Spline
- Polycorner (corners can be shaped with arcs, bezier, chamfer, dog-bone, T-bone junctions)
- Polyline with optional division patterns
FredoSpline is a full rework of my old BezierSpline extension.
It is published at Sketchucation: https://sketchucation.com/forums/viewtopic.php?f=323&t=72402