Set No: Code No: 320501. III B.Tech. II-Semester Supplementary Examinations, November 2003

COMPUTER GRAPHICS

1

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( Common to Computer Science and Engineering, Computer Science and Information Technology, Computer Science and Systems Engineering ) Time: 3 hours Max.Marks:80 Answer any FIVE questions All questions carry equal marks --Explain the item relation table briefly.

2. a) b)

Explain the role of display interpreter in graphical display with a block diagram. What is meant by normalized device co-ordinate system? What are its advantage?

3.

Explain the following: a) Shear transformations b) Image transformations.

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1.

Derive viewing transformation matrix. Write a procedure for delete-all-segments.

5.

Explain the following: Generalised clipping. Multiple windoing.

a) b) 6. a) b)

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4. a) b)

Write 3 Dimentional homogeneous matrix to rotate by  degrees about the line passing through the point (0,0,0) and (1,0,1) Write a note on smooth shading.

Write about the following: a) 3D clipping. b) Shading algorithms.

8.

Explain the process of generating curves and surfaces using a) Hermite method b) B-spline method.

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Set No: Code No: 320501. III B.Tech. II-Semester Supplementary Examinations, November 2003

COMPUTER GRAPHICS

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( Common to Computer Science and Engineering, Computer Science and Information Technology, Computer Science and Systems Engineering ) Time: 3 hours Max.Marks:80 Answer any FIVE questions All questions carry equal marks --Explain the display file without symbols.

2.

Explain the scan-line algorithm for polygon filling.

3. a) b)

Show that 2-D scales and rotations do not commute in general. What are image transformations? Explain.

4.

Write procedures for creating and closing segments.

5.

Explain line clipping algorithm with suitable examples.

6. a)

Write the transformation matrix to rotate a point (x,y,z) about Z axis through an angle  in the clockwise direction. Explain about different projection in 3-D space.

Write about the following: a) Generation of curves and surfaces. b) Sweeping method of interpolation.

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8.

Outline the z-buffer algorithm. List the advantages and disadvantages of the zbuffer algorithm.

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b)

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2

Set No: Code No: 320501. III B.Tech. II-Semester Supplementary Examinations, November 2003

COMPUTER GRAPHICS

3

Explain the following terms a) Object coordinate space. b) Instance transformation. c) Instance with respect to graphics.

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2. 3.

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( Common to Computer Science and Engineering, Computer Science and Information Technology, Computer Science and Systems Engineering ) Time: 3 hours Max.Marks:80 Answer any FIVE questions All questions carry equal marks ---

Write an algorithm for interpreting the display file.

Give the homogeneous co-ordinate transformation matrices for the following transformations: a) Entire picture three times as large. b) Counter clock-wise rotation about the origin, by 90 degrees.

Find the normalization transformation N that uses the rectangle A (1,1), B (5,3), C (4,5) and D (0,3) as a window and the normalized device screen as a viewport.

5.

Explain polygon clipping algorithm with a suitable example.

6. a)

Derive the transformation that rotates an object point  degree about the X-axis. Write the matrix representation for this rotation. Write a short note on parallel projections.

b)

Explain the following: a) Painter’s algorithm. b) Warnock’s algorithm.

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4.

Explain display processor system. Write about B-splines.

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8. a) b)

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Set No: Code No: 320501. III B.Tech. II-Semester Supplementary Examinations, November 2003

COMPUTER GRAPHICS

4

b) 3. a) b) 4. a) b)

What is meant by homogeneous co-ordinate system for transformations? What are its advantages? What is meant by composite transformations? How does it achieved? What is the utility of segments? Explain the use of segment table for organizing information about the segments. What are the various data structures that are used for storing segments? Comment on their relative merits and demerits.

Explain the following: a) Cohen-Sutherland line clipping. b) Multiple windowing.

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5.

What is an inside test? Mention and explain various methods with a suitable example. Explain about display file and display interpreter.

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2. a)

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( Common to Computer Science and Engineering, Computer Science and Information Technology, Computer Science and Systems Engineering ) Time: 3 hours Max.Marks:80 Answer any FIVE questions All questions carry equal marks --1. Explain the different coordinate systems used in computer graphics.

Write about 3D viewing transformations. Write the 3D homogeneous transformation matrix for each of the following transformation. i) Shift 0.5 in X, 2.0 in Y and -0.2 in Z ii) Rotate by /4 about X axis.

7.

Describe, in detail, Gouraud shading.Using Gouraud shading, if pixels A,B,C and D have the intensities A: 0.3 B: 0.11 C: 0.5 D: 0.2 What intensities should be assigned to pixels E and F?

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8.

A E

C

B F

D

Explain the following: a) Simple raster display system. a) Sweeping method of Interpolation.

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COMPUTER GRAPHICS Set No:

Information Technology, Computer Science and Systems Engineering ) · Time: 3 hours · Max.Marks:80 ... Outline the z-buffer algorithm. List the advantages and ...
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