def demo_FixedSplines_addByNurbsCurve(sketch: adsk.fusion.Sketch): # Define three points and create an arc along those points pointOne = adsk.core.Point3D.create(0,0,0) pointTwo = adsk.core.Point3D.create(6,9,0) pointThree = adsk.core.Point3D.create(15,12,0) arc3D = adsk.core.Arc3D.createByThreePoints(pointOne, pointTwo, pointThree) nurbsCurve = arc3D.asNurbsCurve # Create the spline using the 3D curve splines = sketch.sketchCurves.sketchFixedSplines fixedSpline = splines.addByNurbsCurve(nurbsCurve)