Here's a PDF with all the perspective notes I collected. These cover 1-point, 2-point, 3-point, cylindrical ("4-point"), hemispherical ("5-point"), spherical ("6-point") perspective, with reflections and shadows too. These are just notes, not a well written book, so pardon the shoddy presentation. https://drive.google.com/file/d/1gYdbx6hebAVjoahw78pCrMLAnJ3hMc7L/view?usp=sharing