Vanishing Point

Pixelxy
Origin
Vanishing Point
Eye Level 
  
Height
Delta x, Δx
Iterations
Thickness

If you are viewing an infinitely long fence, the location of each fence post is proportional to:

x / (1 + x)

where:

x is the distance along the fence from the first fence post.

P.S. This web page runs only on Microsoft's Internet Explorer because it uses their proprietary VML, Vector Markup Language.