In this paper author describes the result of an experiment which illustrates the effect of laser beam incident angle on laser cutting quality. The experiemnt shows the possibility to get a satisfying cutting quality with the non vertical laser beam to work piece surface. This is quite different from the traditional ideas which the laser beam must be vertical to work piece surface for laser cutting. In three dimensional laser cutting author gives the way to obtain good cutting quality when the laser beam is not vertical to work piece surface.