I hope someone know the solution to my problem.
I use extracted nurbs curves as basis for creating cutting paths for CNC-cutters. The path must be 2D so I convert the nurbs to polygons. This is ok for flat surfaces, but for arcs and circles the polygon consists of hundreds or thousands of lines.
I would like to convert the nurbs curve to a polyline, witch would keep arc and circles intact. But there is no convert-to-polyline command.