### Exam Year

Tribhuvan University

Institute of Science and Technology

Model Set I

Bachelor Level / third-semester / Science

Computer Science and Information Technology( CSC209 )

Computer Graphics

Full Marks: 60 + 20 + 20

Pass Marks: 24 + 8 + 8

Time: 3 Hours

Candidates are required to give their answers in their own words as far as practicable.

The figures in the margin indicate full marks.

Group A

Attempts any two questions

1

Why normal equation of circle is not used to compute circle? Write algorithm for bersenham’s line drawing technique. derive mid-point circle algorithm.

2

Describe the architecture of raster and random scan display. How scaling method is used in hidden surface removal.

3

Find viewport coordinates of quadrilateral (1,1),(1,2),(2,2)and(3,4) in a window with diagonal  endpoints (1,1),and (4,4) to view port with diagonal end points (3,2),and (6,6).

Group B

Attempts any EIGHT questions

4

Explain software standards in computer graphics.

5

explain scanline polygonal filling technique .

6

What are the advantage of a homogeneous coordinate system? Explain and derive 2D shear about a base line y=yref

7

What is a window to viewport transformation, Deduce window to viewport transformation with appropriate mathematical expression .

8

Clip a line using cohen sutherland algorithm with end points (10,10) and (60,30) in a window (15,15) and (25,25).

9

Reflect a traingle (2,4),(4,6),(2,6) about a line y=1/2(x +4)

10

Derive oblique projection matrix. what is the difference between cabiliar and cabinet projection?

11

What is specular reflection model of phong? Explain shadows and intensity attenuation in illumination modelling?

12