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UGC-NET | UGC NET CS 2016 July – III | Question 16

In perspective projection, if a line segment joining a point which lies 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 _______.
(A) View confusion
(B) Vanishing point
(C) Topological distortion
(D) Perspective foreshortening

Explanation:

• In perspective projection, if a line segment joining a point which lies 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.
• 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.

So, option (C) is correct.

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