MODEL PAPER

B. Tech (IT) Degree Examination

Third Year - First Semester

COMPUTER GRAPHICS

Effective from the admitted batch of 2004-2005

Time: 3 hrs
Max Marks: 70

First Question is Compulsory

Answer any four from the remaining questions

All Questions carry equal marks

Answer all parts of any question at one place

1. Explain the following:
a) Pixel Addressing
b) Homogeneous Coordinates
c) Graphics Work stations
d) GUI?
e) Antialiasing?
f) View port?
g) Blending functions of Bezier curves?

2. a) Describe the working of a CRT.

b) What are the differences between the raster scan and random scan devices?

3. a) Describe the Bresenham’s line drawing algorithm for all quadrants.

b) Explain how the Bresenham's line drawing algorithm works for the line joining the points (-2, 3) and (5, 6).

4. a) Describe Cohen - Sutherland algorithm for line clipping.

b) Describe the Sutherland - Hodgaman algorithm for polygon clipping.

5. a) Describe the matrix forms of the two dimensional transformations of translation, rotation and scaling.

b) Derive the transformation matrix for finding the reflection of a point with respect to the Line y= mx + c.

6. Describe various graphic input devices explaining their logical functions Describe the methods for character generation.

7. a) Describe the 3D transformations for rotation, scaling and translation.

b) Find the combined matrix transformation of the following:
3D rotation of an object by α degrees around X-axis followed by a 3D rotation of β degrees around Y axis. which in turn is translated with a units along X-axis, b units along Y-axis c units along Z-axis.

8. a) How are surfaces generated in computer graphics ? Explain.

b) Derive the matrix transformation for standard perspective projection.

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