For some years I have been working on what I call "The Unified Field", a way to work out any angle of one-, two-, or three-point perspective with a consistent cone of vision on a single piece of paper. In the past this has involved me drawing a large chart mapping out every possible vanishing point on multiple horizons, with lines between them making hyperbolic tracks in the sky, or a complicated Escher-type globe on which the corners of multiply tilted cubes can be plotted, both of which involve a staggering amount of visual information. This time I have not a chart, but a method to accurately place vanishing points that I believe will work in all cases.
While this may seem like advanced stuff, my hope is that this will simplify three-point perspective by turning it from a construction that must be drawn from scratch each time, to something that can be naturally built on top of an existing one- or two-point diagram. It is only embarrassing to me that I made this discovery so late, after already having written two books on the subject.