UGC-NET | UGC NET CS 2016 Aug – III | Question 17

In perspective projection (from 3D to 2D), objects behind the centre of projection are projected upside down and backward onto the view-plane. This is known as _____.
(A) Topological distortion
(B) Vanishing point
(C) View confusion
(D) Perspective foreshortening


Answer: (C)

Explanation:

  • In perspective projection (from 3D to 2D), objects behind the centre of projection are projected upside down and backward onto the view-plane. This is known as view confusion.
  • Vanishing point: Where all parallel points appear to meet is called vanishing point.
  • Perspective foreshortening: As we move from centre of projection size of object varies inversely with distance, this is known as perspective foreshortening.
  • Topological Distortion: A line segment joining a point lying in front of the viewer to a point in back of the viewer is projected to a broken line of infinite extent.This is known as topological distortion.

So, option (C) is correct.


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