Computer Graphics - Dec 2015

Information Technology Engineering (Semester 4)

TOTAL MARKS: 100
TOTAL TIME: 3 HOURS (1) Question 1 is compulsory.
(2) Attempt any four from the remaining questions.
(3) Assume data wherever required.
(4) Figures to the right indicate full marks.

Solve any one question from Q1 and Q2

1 (a) List the method for character generation. Explain any two character generation methods briefly.(6 marks) 1 (b) Derive the equation for decision parameter of midpoint circle algorithm.(6 marks) 2 (a) Explain Scan-Line Polygon filling algorithm.(6 marks) 2 (b) Write matrix representation for the following 3D transformations:
i) Reflection about XY-plane.
ii) Rotation about X-axis
iii) Translation in X, Y and Z-directions
iv) Scaling.(6 marks)

Solve any one question from Q3 and Q4

3 (a) Let ABCD be the rectangular window with A(20, 20), B(90, 20), C(90, 70) and D(20, 70). Find the region codes for endpoints and use Cohen-Sutherland algorithm to clop the lines P₁-P₂ with P₁(10, 30) and P₂(80, 90) and Q₁-Q₂ with Q₁(10, 10) and Q₂ (70, 60).(6 marks) 3 (b) Explain ways of projecting 3D objects onto 2D screen in detail.(6 marks) 4 (a) Explain display file structure. Why is display file interpreter used? Which are the commands used in display file interpreter?(6 marks) 4 (b) Explain the different types of polygons. Also explain the various methods for testing a pixel inside a polygon.(6 marks)

Solve any one question from Q5 and Q6

5 (a) Explain HSV color model and also compare it with RGB color model.(6 marks) 5 (b) Explain Gourand shading and Phong Shading methods.(7 marks) 6 (a) What is Animation? Explain the basic rules required for Animation.(6 marks) 6 (b) How is Polygon shading different from polygon filling? Explain Phong shading briefly.(7 marks)

Solve any one question from Q7 and Q8

7 (a) Explain the technique of smoothing of curves using B-Spline.(6 marks) 7 (b) Give the set of equations of Bezier curve. Write the algorithm for drawing a Bezier curve section using four points.(7 marks) 8 (a) Explain features of any graphics tool that you had studied.(6 marks) 8 (b) How are fractals used to generate fractal surface? Give two examples of fractal surface.(7 marks)