Computer Graphics - Graphics Operations

16:
Find the incorrect statement(s).
 A. A perspective projection produces realistic views. B. A parallel projection gives realistic representation of 3-D objects. C. A perspective projection preserves realistic dimensions. D. Both (b) & (c) Answer Report Discuss Option: D Explanation : Click on Discuss to view users comments. Write your comments here:
17:
Consider the three points, A(3, 6,4); B(2, 5, 5); C(O, 3, 7) and the view point V(l, 4,6).
Choose the correct option(s).
 A. C hides A and B, if viewed from V B. C hides A but not B, if viewed from V C. A hides B but not C, if viewed from V D. B hides A but not C, if viewed from V Answer Report Discuss Option: D Explanation : The equation of the line joining V and A is given by x = t + 3; y = t + 6; z = 4 - t. Since Band C satisfy this, all the four points are collinear. We can find that t = 0 for A, t = -1 for B, t = -2 for V and t = -3 for C. From these values it is clear that these points lie in the order C, V, B, A. Hence  the answer Click on Discuss to view users comments. Write your comments here:
18:
The people of the planet Mars designed a scale for measuring the temperature in which water freezes at 100 units and boils at 250 units. The people of Jupiter designed a scale in which water freezes at 75 units and boils at 300 units.The two scales coincide at
 A. 130 B. 165 C. 150 D. 170 Answer Report Discuss Option: C Explanation : We have to find the temperature that is same in Mars and Jupiter. Put M = J in the equation (M -100) x 225/150 = J -75 and solve to get 150 Click on Discuss to view users comments. Write your comments here:
19:
Which of the following curves are symmetric about the line x = y?
 A. 1 + x + y = 0 B. | x | +  | y | = 9 C. y=x3 D. Both (a) & (b) Answer Report Discuss Option: D Explanation : lf the equation of the curve is unaltered, if x is replaced by y and y by x, then the curve will be symmetric about the line x = y. Click on Discuss to view users comments. Write your comments here:
20:
A line connecting the points (1, 1) and (5,3) is to be drawn, using the DDA algorithm. Find the value of x and y increments.
 A. x-increment = 1 ; y-increment = 1 B. x-increment = 0.5; y-increment = 1 C. x-increment = 1 ; y-increment = 0.5 D. none of the above Answer Report Discuss Option: C Explanation : x - increment =  x2 -x1 / max ((x2 -x1), (y2 - y1)) y - increment = y2 -y1 / max ((x2 -x1), (y2 - yl)) Click on Discuss to view users comments. Write your comments here: