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Architectural Drawing and Representation: Orthographic projection · Principles of Parallel Projection

Explains how orthographic projection turns buildings into measurable flat views: true size, foreshortening, edge views and how views relate.

Architectural Drawing and Representation · 27 questions

Try 3 questions

1. In orthographic projection, how do the projecting lines relate to the drawing plane?

  1. Parallel, and perpendicular to the plane
  2. Parallel, but slanted to the plane
  3. Converging on a single eye point
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Answer: Parallel, and perpendicular to the plane

Orthographic means 'right-angled drawing': every projector is parallel to the others and meets the picture plane at 90°, unlike perspective (converging) or oblique (slanted) projection.

2. Two identical columns stand 5 m and 50 m behind the picture plane. How do they appear in an orthographic elevation?

  1. Exactly the same size
  2. The nearer one appears taller
  3. The farther one appears smaller
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Answer: Exactly the same size

Because projectors are parallel, distance from the plane has no effect on size; only perspective makes far objects shrink.

3. Why can a builder take measurements straight off a scaled elevation but not off a perspective view?

  1. Perspectives leave out hidden construction lines
  2. Elevations are always drawn at full size
  3. Orthographic sizes don't change with depth
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Answer: Orthographic sizes don't change with depth

In an orthographic view every face parallel to the plane keeps one constant scale, so a ruler gives real dimensions; in perspective the scale changes with distance.

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