Simply drawing accurate perspective

Описание

How to easily and accurately put windows in perspective on the side of a building. Roger starts by drawing a horizon line and a building, using a vanishing point to create two-point perspective then divides the space into five equal parts to represent five windows then draw sdiagonal lines from each point to the vanishing point. Intersecting these lines with a diagonal line going from corner to corner determines the accurate perspective for each window. The size of the windows can vary as long as the lines still go to the vanishing point. The process is repeated on the other side of the building. This method helps create the appropriate spacing between windows.

Here's a link to another similar but slightly different take on the subject.
https://www.youtube.com/watch?v=npWYLktl9Pk