Tribhuwan University

Institute of Science and Technology

2081

Bachelor Level / Third Year / Fifth Semester / Science

Bachelors in Information Technology (BIT304)

(Computer Graphics)

Full Marks: 60

Pass Marks: 24

Time: 3 Hours

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

The figures in the margin indicate full marks.

Section A

Long Answers Questions

Attempt any TWO questions.
[2*10=20]
1.
Describe z-buffer method for visible surface detection. State its limitations and how these limitations can be reduced. [10]
2.
What is the role of clipping? Plot the line with end points (20, 10) and (30, 18) using DDA. [10]
3.
List the rotation matrix in clockwise direction with respect to x-axis, y-axis and z-axis. Rotate the object (0, 0, 0), (2, 3, 0), (5, 4, 0) about the rotation axis y = 4. [10]
Section B

Short Answers Questions

Attempt any Eight questions.
[8*5=40]
4.
Write procedure to render the polygon surface by using Phong shading model. [5]
5.
Explain about parametric cubic curve with its properties. [5]
6.
Digitize circle with center (0, 0) and radius = 6. [5]
7.
Explain the use of polygon tables for boundary representations. [5]
8.
Differentiate between raster scan and random scan display systems. [5]
9.
What is intensity attenuation? Describe the various types of projection. [5]
10.
Explain about openGL and call back functions. [5]
11.
How the geometric and attribute information of a 3D objects are stored for the object representations? Explain with suitable example. [5]
12.
Write short notes on: a) Ambient light b) Diffuse reflection [5]