In 3š· Graphics, which of the following statements about perspective andā¦
2018
InĀ 3š·Ā Graphics, which of the following statements about perspective and parallel projection is/are true?
P : In a perspective projection, the farthest an object is from the center of projection, the smaller it appears
Q : Parallel projection is equivalent to a perspective projection where the viewer is standing infinitely far away
R : Perspective projections do not preserve straight lines.
Answer: A. P and Q only ā Correct answer: Statements P and Q are true; statement R is false. P is true: In perspective projection, objects farther from the center of projection appearā¦
- A.
P and Q only
- B.
P and R only
- C.
Q and R only
- D.
P, Q and R
Attempted by 75 students.
Show answer & explanation
Correct answer: A
Correct answer: Statements P and Q are true; statement R is false.
P is true: In perspective projection, objects farther from the center of projection appear smaller due to perspective foreshortening; image size decreases with distance from the viewpoint.
Q is true: Parallel projection is the limiting case of perspective projection when the viewer is infinitely far away; the projection rays become parallel and do not converge to a finite center.
R is false: Perspective projections preserve straight lines ā a straight line in space projects to a straight line (or a degenerate point) in the image, so perspective does not break straightness.
Therefore the correct selection is the combination that includes P and Q only.