To draw a simple shape using constructions can drive you mad if you rotate it at an angle different from isometric projection. Eventually, you come to realize that you should forget this kind of skill and draw as your brain and eyes suggest. Otherwise, it’s just too complicated with all these auxiliary lines. Besides, I already made a mistake with the upper part, I outlined the wrong area.
Did you have descriptive geometry in school?
Hi, I'm Rauf Aliev. 