Let me see if I can help. Perspective relies on a vanishing point. the vanishing point is that spot on the horizon where all horizontal lines converge.
If you look along a straight road, the parallel sides of the road appear meet at a point in the distance. This point is called the vanishing point.
To draw in perspective, draw a horizon line and draw a vanishing point anywhere on the horizon. Lines which are parallel in real life are drawn to intersect at the vanishing point.
Distant figures appear smaller but have the same shape and proportions as they would close up. In geometry, we would say that the figures are similar.
In order for a drawing to have a realistic effect it needs 2 vanishing points. This is called two-point perspective drawing. There are three types of lines: lines that converge to the left at a point (called the Vanishing Point Left), lines that converge to the right at a point (called the Vanishing Point Right), and vertical lines. Sometimes the vertical lines have a vanishing point as well making the drawing a three-point perspective drawing, say if you are really close to a building looking up, but for the most part two-point perspective drawing is the norm.
When drawing in perspective, you can vary your
point of view by altering the position of the vanishing points.
For more information on how to draw in a two-point perspective check out this page.
http://mathforum.org/workshops/sum98...DrawPersp.html
For more information on how to draw in a one-point perspective check out this page.
http://mathforum.org/workshops/sum98.../1ptPersp.html
I hope this helps.
Christopher the Garden Gnome