Download AKTU B-Tech 5th Sem 2015-2016 Computer Graphics Ecs 504 Question Paper

Printed Pages : 4

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ECS-504

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Following Paper ID and Roll No. to be filled in your Answer Book)

Paper ID: 110514

Roll No.

B.Tech.

(SEM. V) THEORY EXAMINATION, 2015-16

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COMPUTER GRAPHICS

[Time: 3 hours]

[MaximumMarks : 100]

Note: Attempt questions from all Sections as per directions.

Section-A

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Attempt all parts of this section. Answer in brief. (2×10=20)

1. (a) Give window to viewport transformation matrix.
2. (b) We require large refresh rate mainly due to short persistence of phosphor. Why not use a long persistence of phosphor instead to reduce the frame rate?
3. (c) What is resolution?
4. (d) Define computer graphics.

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5. (e) Define polygon.
6. (f) What is transformation?
7. (g) What is translation?
8. (h) Define clipping.
9. (i) Define B-Spline curve

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10. (j) What is a spline?

Section-B

Attempt any five questions from this section. (10×5=50)

2. Rotate a triangle at A (0, 0), B (1, 1), C (5, 2) by 45° about: (i) Origin (0, 0) (ii) Point P (-1, -1). Find new coordinates of the rotated figure.
3. Write Liang-Barsky algorithm for line clipping. Use Liang-Barsky line clipping algorithm to clip the line P1 (-15, -30); to P2 (30, 60) against the Window having diagonally opposite corners as (0, 0) and (15, 15).

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4. What is the importance of hidden line and surface removal algorithm? Discuss the mechanism of Z-buffer surface removal algorithm and differentiate it with A-buffer surface removal algorithm.
5. Show that the uniform scaling and rotation make commutative pairs but in general scaling and rotation are not commutative.
6. Implement a back-face detection procedure using an orthographic parallel projection to view visible faces of a convex polyhedron. Assume that all parts of the object are in front of the view plane and provide a mapping onto a screen viewport for display.
7. Show that the composition of two rotations is additive by concatenating the matrix representations for R (?1) and R (?2) to obtain R (?1) *R (?2)=: R (?1+?2)
8. Explain with example - Warnock algorithm for hidden surface removal. Also draw the window tree structure for the same example.

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9. Design a parallel version of Bresenham's algorithm for straight lines of any slope.

Section-C

Attempt any two questions form this section. (15×2=30)

10. (a) Write and explain with example Weiler and Atherton polygon clipping algorithm.
    (b) Explain the working of color CRT by using delta shadow mask method.

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11. Write short notes on any two of the following:
    1. 3-D transformation
    2. 3-D projection
    3. 3-D clipping
12. (a) Write an algorithm to draw Bezier curves.
    

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    (b) What are the various back face detection algorithms? Explain any one of them.

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