The type of drawing that was easier for me was the Ipad. It was perspective drawing because it is 3-D. The most difficult part about creating perspective drawings was figuring out the length and width of the shape/object. A vanishing point is a point at which receding parallel lines viewed in perspective appear to converge. The difference between one-point, two-point, and three-point perspective sketch is the distance. A perspective drawing differ from an isometric drawing of the same object is when is a 3-D drawing and the other one isnt. You would use a isometric drawing when you don´t want to do a 3-D drawing.