Add More Dimension to Your World: Two-Point Perspective chapter 7
The diagram clearly indicates that once you determine your eye level, which is the horizon line in your view, all of the vanish-
ing points will fall here.
Whether you are standing in a landscape or in a room, a great technique for always being able to determine your eye level
and horizon line is to cut a length of wood (1" x 1" or 1" x 2") that is the length from the ground to the height of your eyes as
you are standing erect. When your eye-level stick is placed vertically anywhere within your subject, you know where your eye
level and horizon line are.
Vanishing
PointVanishing
PointVanishing
PointViewer or Vantage PointHorizon Line
and Eye LevelTIP
Know Your Eye Level
The eye-level stick (or marker) is especially helpful
when there are hills in a landscape, or buildings or
houses obstructing your view of the horizon line.