SPPU Information Technology (Semester 4)
Computer Graphics
December 2015
Total marks: --
Total time: --
INSTRUCTIONS
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary


Solve any one question from Q1 and Q2
1 (a) List the method for character generation. Explain any two character generation methods briefly.
6 M
1 (b) Derive the equation for decision parameter of midpoint circle algorithm.
6 M

2 (a) Explain Scan-Line Polygon filling algorithm.
6 M
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 M

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 M
3 (b) Explain ways of projecting 3D objects onto 2D screen in detail.
6 M

4 (a) Explain display file structure. Why is display file interpreter used? Which are the commands used in display file interpreter?
6 M
4 (b) Explain the different types of polygons. Also explain the various methods for testing a pixel inside a polygon.
6 M

Solve any one question from Q5 and Q6
5 (a) Explain HSV color model and also compare it with RGB color model.
6 M
5 (b) Explain Gourand shading and Phong Shading methods.
7 M

6 (a) What is Animation? Explain the basic rules required for Animation.
6 M
6 (b) How is Polygon shading different from polygon filling? Explain Phong shading briefly.
7 M

Solve any one question from Q7 and Q8
7 (a) Explain the technique of smoothing of curves using B-Spline.
6 M
7 (b) Give the set of equations of Bezier curve. Write the algorithm for drawing a Bezier curve section using four points.
7 M

8 (a) Explain features of any graphics tool that you had studied.
6 M
8 (b) How are fractals used to generate fractal surface? Give two examples of fractal surface.
7 M



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