Three-point towers
This drawing depicts three-point perspective,
useful for representing steep views looking up
or down tall structures. (Turn the book around
to see a view looking up.) By comparing this
drawing to Piranesi's example of two-point
perspective on p.75, you will see how, by adding
a third point you can achieve a sense of incline.
Three-point curves
Here, three vanishing points are evenly spaced
along a horizon line. An array of curved lines
(drawn freehand) link the two lateral points.
I used these lines as a guide to draw the
curvature of boxes and panels flying through
space. Giving curvature, and therefore tension,
to straight lines can amplify drama in a picture.Three-point checkered floor
This drawing shows how to draw a checkered
floor. I started with two parallel lines. I marked the
top line with three evenly spaced points and the
bottom line with seven. I then drew three fanned
groups of lines connecting each of the three
points above to the seven points below. Where
the lines cross, they mark the corners of the floor
tiles. Finally, I added horizontal lines to define the
tiles. Note that altering the distance between the
three dots above will tilt the level of the floor