Well if you want the laser to produce better images then one needs to use the dark art of cam design. As it turns out, simply determining cam geometry necessary to go through all those points is not enough, one must also take into account the velocity, acceleration, and even jerk profiles(the derivative of acceleration). If one does not take these into account the follower being driven can't spring back fast enough and the follower does not follow the intended profile. Most automobile cams must be produced to very high tolerances in order to achieve low vibration. The fact that CNC machine tools move in discretized distances can cause problems in some cases.