A method and control apparatus for generating control data for controlling a tool on a machine tool for machining a clamped-in workpiece, the machine tool having a control apparatus and a tool for controlling the tool, comprising: generating a path program using a setpoint geometry of generated setpoint parameters, the path program describing a path having supporting points and line elements; controlling the machine tool according to the generated path program; detecting actual parameters by a feedback loop; iteratively optimizing the path program using the detected actual parameters for generating a new path program with a new path, the new path program being dynamically supplied in real time and the new path program dynamically changing and/or dynamically replacing the previous path program; providing CAM functionality for changing an order of the supporting points; and embodying both the path program and the new path program as a CNC program.