Perspective Terminology (concept drawing)

Defining perspective from the viewing position: Following Scott Robertson's words, "When drawing, it's best to maximize the space on the page and not draw objects that are too distorted." (Robertson 23). A person's view is in a cone, to put it the simple way, and the farther back the person is from the object in focus, the wider their angle of sight is making said cone bigger. Take Robertson's advice about these angles for each perspective of drawing. "1-point perspective is very prone to distortions. to avoid them altogether stay within a 50 degree cone of vision" (Robertson 23) For lower point perspective drawings, the angle should be lower, increasing as the number of points goes up to decrease distortions around the edges of a drawing. for two and three point drawings a 60 degree cone of vision keeps distortion minimal. and for 5 and above there can be larger angles all the way up to 180 degrees because at that point the drawing becomes similar to a wide angle lens or a fish eye photo. 

Created in gravit designer

            When it comes to perspective drawing, there are three types of ways to draw. One-point perspective has a general shape (red with the blue dots) with the black lines converging towards one point. Two-point perspective utilizes two points on a horizontal axis, the general shape now converges towards point 2 and the sides outlined in black go towards point 1 (the same point as in one-point perspective). This creates the ability to rotate the viewing point from left to right. Three point perspective has the same points as two point perspective, but with a third point somewhere above or below the other two points to give a viewing point that can be tilted up and down. See examples of these drawing techniques below.

 Question: Can a fourth point of drawing exist logically? How and why? keep in mind that the fourth point would be another point on the horizontal axis, making the top and bottom of the shape visible.