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University of Madras (UoM)

University of Madras (UoM)

Syllabus

Test Papers

Permission for writing BE/BTech/BArch/ME Exams

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Computer Graphics
Computer Graphics
OCTOBER 2003
U/IC 14658/NCE

Time: Three hours
Maximum: 100 marks

PART A - (10 x 2 = 20 marks)

Answer ALL questions.
All questions carry equal marks.

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

2. Define aspect ratio of video monitor.

3. What are homogeneous coordinates?

4. What are 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, define colors blue, magenta, white and yellow.

PART B - (5 x 7 = 35 marks)

Answer ALL questions.
All questions carry equal marks.

11. (a) Write the equations to define the polygon planes and to identify inside and outside points.

Or

(b) With an example, explain the representation of polygon using polygon table.

12. (a) Explain the transformations translation and scaling. Write the transformed coordinates and give a suitable diagram for illustration.

Or

(b) What are segment files? Explain its organisation for a random scan system.

13. (a) Explain point clipping with an example.

Or

(b) Explain mapping of a point in a window to a viewport.

14. (a) Represent the following 3D object by vertex, edge and polygon surface tables. Explain the representation.

-- DIAGRAM--

Or

(b) Explain 3D clipping.

15. (a) What is phong shading? Explain.

Or

(b) Explain HLS color model.

PART C - (3 x 15 = 45 marks)

Answer any THREE questions.
All questions carry equal marks.

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

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

-- DIAGRAM--

18. Illustrate line clipping using Cohen and Sutherland algorithm.

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

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