Hi Jonathan. Thanks for your answer. I did an exercise and find this “subdivided cage” aproach does not work in some cases – sure it is a good way to fix distortion but this subdivision ruins some smooth shaded areas. For example if we create 12 edges extruded circle it should looks smooth with smooth shade turned on, but if we subdivide it with some hudge subdiv level (sure with “simple option”) we lost this smooth shade effect due to frequent geometry – so we get flat shaded looking normal map.
