Question

In the ___________ method, the points on the perspective are obtained by projecting the top view with either the front view or the side view of the visual rays.

(a) vector

(b) concurrent

(c) visual ray

(d) straight line

I had been asked this question in an interview for internship.

This interesting question is from Perspective Projection in section Development of Surfaces, Isometric Projections, Perspective Projections & Transformation of Projections of Civil Engineering Drawing

Answer 1

Correct choice is (c) visual ray

Explanation: In the visual ray method,  the points on the perspective are obtained by project ting the top view with either the front view or the side view of the visual rays. The method of drawing the perspective by visual ray method is illustrated by the problem below:

Problem

A hexagonal lamina of 45 mm edge lies on the ground.  The corner which is nearest to PPP is 25 mm behind it and an  edge containing that corner is making 50° to PP. The station point is 50 mm in front of  PPP. 60 mm above Ground plane and lines in a central plane which is  80 mm to the left of the corner nearest to PPP. Draw the perspective view of the lamina by visual ray method.

Solution: The solution to the problem is illustrated in figure below:-