Madras University (UnOM) 2006 B.C.A Computer Application Computer Graphics - Question Paper

Time: 3 hours
Maximum: 100 marks

PART A [10*2 = Marks 20]

ans ALL ques..
All ques. carry equal marks.

1. Write the formula of line segment with the end points (x1,y1) and (x2,y2)

2. describe aspect ratio of video monitor.

3. elaborate homogeneous coordinates?

4. elaborate the attributes of a segment?

5. What is meant by clipping?

6. What is a region code in clipping?

7. Compare parallel projection and perspective projection.

8. Represent perspective transformation in matrix form using 3D homogeneous co-ordinates.

9. Differentiate point source and distributed light source.

10. In RGB color model, describe colors blue, magenta, white and yellow.

PART B - [5*7 = Marks 35]

ans ALL ques..
All ques. carry equal marks.

11. (a) Write the equations to describe the polygon planes and to identify inside and outside points.
Or
(b) With an example, discuss the representation of polygon using polygon table.

12. (a) discuss the transformations translation and scaling. Write the transformed coordinates and provide a suitable diagram for illustration.
Or
(b) elaborate segment files? discuss its organisation for a random scan system.

13. (a) discuss point clipping with an example.
Or
(b) discuss mapping of a point in a window to a viewport.

14. (a) Represent the subsequent 3D object by vertex, edge and polygon surface tables. discuss the representation.
-- DIAGRAM--
Or
(b) discuss 3D clipping.

15. (a) What is phong shading? discuss.
Or
(b) discuss HLS color model.

PART C - [3 * 15 = Marks 45]

ans any 3 ques..
All ques. carry equal marks.

16. Write Bresenham's algorithm. Illustrate drawing a circle. How do you extend it to draw ellipses?

17. discuss how the square shown in fig. (i) can be transformed to shapes in figure (ii), (iii) and (iv). Write the transformation matrix in every case.

-- DIAGRAM--

18. Illustrate line clipping using Cohen and Sutherland algorithm.

19. discuss how (a) translation (b) scaling (c) rotation can be performed on 3D objects. Write their transformation matrix.

20. discuss how halftoning method can be used to furnish intensity variations in a scene. How can this method used to accomplish dithering?

Earning:   Approval pending.