Vanishing point is a concept used in art to figure out how to render a 3d image in 2d with the appearance of 3d.
http://mathworld.wolfram.com/VanishingPoint.htmlTheoretical vanishing point is at infinity, most use the edge of the paper. Your buildings will look slightly lopsided, better if you tape a second sheet of paper on and use a focal point farther away. Best is infinity.
An ant would see as far as an ant eye lens would view or until blocked by a closer object. A person would get the same view if he put his eye on the floor at the same spot. An ant eye at the same height as a person's eye would see the same view. Ditto them looking at a rendering that used perspective.
Imagine train tracks straight down a valley with a mountain at the and of it. The tracks get closer and closer in the distance, and disappear. That is not vanishing point, that is when they are so distant their image is narrower than the arc of a rod/cone in your eye. Just as a digital video camera or your screen can't depict something smaller than a pixel. The mountain is visible not because it is higher, but because it is bigger. We are used to thinking higher = see farther because the closer to the ground, the more obstacles.
Does it delight you that I answered this way? Do you honestly think altitude has something to do with how far you can see other than raising you higher above the horizon, as in RE explanation? Are you trolling me? Do you think vanishing point and perspective explain things on RE? Do you understand the RE meaning of these words, because many FErs do not understand the RE meaning. It is possible to disagree of disprove an RE explanation only if you understand it. Many FErs give wrong explanations of these things, and I suspect they do it on purpose. Odd way to enjoy life. I would like to explain this stuff to someone who doesn't know it. Do you understand sextant and equatorial mount on RE? I find them more amazing than the atmolayer.
I have never found a FEr who could explain how a sextant or equatorial mount work even if he didn't believe it. Many FErs present themselves as educated and intellectually skilled, but I don't think any of them are smart enough to understand sextant /north star/ latitude or equatorial mount. They lack the ability to understand these things, just not able.