Computer Graphics 2018 Question Paper — Government College of Enginee…

The 2018 Computer Graphics previous year question paper (Government College of Engineering and Technology, Jammu), with every question and its marks.

Instructions

Attempt five questions in all, selecting at least two questions from each section.

Q1(a). (a) What do you mean by Interlacing ? What is its importance ? How is flicker reduced by interlaced scanning ? [5 marks]
Q1(b). (b) Discuss the important characteristics of video display devices. [5 marks]
Q1(c). (c) Differentiate between bitmap and stroke method of character generation. Give their advantages and limitations. [5 marks]
Q1(d). (d) List the advantages and disadvantages of DVST. [5 marks]
Q2(a). (a) Derive Bresenham's line generation algorithm. Use Bresenham's line generation algorithm to rasterize the line from $(0, 0)$ to $(6, 7)$. [10 marks]
Q2(b). (b) Describe boundary fill algorithm for filling the polygon with a suitable example. [10 marks]
Q3(a). (a) Explain Bresenham's circle algorithm. Determine the various pixel locations that would be plotted in an octant if circle of radius $10$ units is centered at $(30, 30)$ using Bresenham's algorithm. [14 marks]
Q3(b). (b) Briefly discuss the term "Viewing Transformation". Support your discussion with a suitable diagram and related mathematical equations. [6 marks]
Q4(a). (a) Consider the line $L$ and triangle $ABC$. The equation of line $L$ is $y = 1/2 (x + 4)$ and $A(2, 4)$, $B(4, 6)$, $C(2, 6)$. Reflect the triangle about $L$. [10 marks]
Q4(b). (b) Perform counterclockwise $60$ degree rotation for triangle $A(2, 3)$, $B(5, 5)$, $C(4, 3)$ and about point $(1, 1)$. [10 marks]

Q5(a). (a) Given the clipping window $A(20, 20)$, $B(60, 20)$, $C(60, 40)$, $D(20, 40)$. Using Sutherland Cohen algorithm find the visible portion of line segment joining the points $P(40, 80)$, $Q(120, 30)$. [10 marks]
Q5(b). (b) Draw the flowchart illustrating the logic of Sutherland Hodgman polygon clipping algorithm. What are its limitations ? [10 marks]
Q6(a). (a) Derive the matrix for mirror reflection with respect to the plane passing through the origin and having a normal vector whose direction is $N = I + J + K$. [10 marks]
Q6(b). (b) The pyramid defined by the coordinate $A(0, 0, 0)$, $B(1, 0, 0)$, $C(0, 1, 0)$ and $D(0, 0, 1)$ is rotated $45$ degree about line $L$ that has the direction $V = J + K$ and passing through the point $C(0, 1, 0)$. Find the coordinate of the rotated figure. [10 marks]
Q7(a). (a) Discuss any two interpolation shading methods. [10 marks]
Q7(b). (b) Explain the different anomalies which may occur in perspective projection of an object. [10 marks]
Q8. Derive the transformation for cavalier projection with $\theta = 45^\circ$ and cabinet projection with $\theta = 30^\circ$. Draw the projection of the unit cube for each transformation. [20 marks]