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Computer Graphics Question Paper
Computer Graphics
Course:Bachelor Of Science In Information Technology
Institution: Kca University question papers
Exam Year:2010
UNIVERSITY EXAMINATIONS: 2010/2011
FIRST YEAR STAGE EXAMINATION FOR THE DEGREE OF BACHELOR
OF SCIENCE IN INFORMATION TECHNOLOGY
BIT 2304: COMPUTER GRAPHICS
DATE: DECEMBER 2010 TIME: 2 HOURS
INSTRUCTIONS: Answer question ONE and any other TWO questions
QUESTION ONE (30 MARKS)
There are a number of ways that 2D data can be structured in a computer. Among these techniques are:
Topological data structure, Whole polygon structure, point and polygon structure and spaghetti
structure.
The figure below shows a representation made up of 3 polygon structures (A, B, and C), 15 linear
structures (l1, l2 , l3, ………….. l15 ) , and nodes (a, b, c ……….n).
Using figures and lists, illustrate the representation using each of the mentioned types of data
structures.
A B C
l1 l2
l3
l4
l6 l5
l7 l8 l9
l10
l14 l15
l11
l12
l13
a b c
d
g f e
h
i j
k
l
m n
2
(30 Marks)
QUESTION TWO (20 MARKS)
Consider a mesh as shown in the figure below. There are 8 nodes and 12 edges, 5 interior polygons and
6 interior (shared) edges. Each vertex has a location vi = (xi yi zi).
i. By putting the geometry in an array, use pointers from the vertices to derive a vertex list that
clearly illustrate the distinction between the representation topology and geometry. (15 Marks)
ii. Derive an edge list without using the polygons in the representation. (5 Marks)
QUESTION THREE (20 MARKS)
a) Describe four classical geometrical planar projections in computer graphics. (5 Marks)
b) Given the View Reference Point VRP = (0,0,0), View Plane Normal VPN = (0,0,1), View Up
vector VUP = (0,1,0), Projection Reference Point PRP = (1,1,1), (umin, vmin) = (2, 4), and (umax, vmax) =
(6,8).
i. Calculate the direction of projection (DOP). (10 Marks)
ii. Approximately draw the parallel projection view volume. Explain your answer.(5 Marks)
QUESTION FOUR (20 MARKS)
i. Consider a raster system with the resolution of 1024 x 768 pixels and the color palette calls for
65,536 colors. What is the minimum amount of video RAM that the computer must have to
support the above-mentioned resolution and number of colors? (10 Marks)
v1
v2
v7
v6
v8
v5
v4
v3
e1
e8
e3
e2
e11
e6
e7
e10
e5
e4
e9
e12
3
ii. Consider three different raster systems with resolutions of 640 x 480, 1280 x 1024, and 2560 x
2048. What size is frame buffer (in bytes) for each of these systems to store 12 bits per pixel?
(5 Marks)
iii. Consider two raster systems with the resolutions of 640 x 480 and 1280 x 1024. How many
pixels could be accessed per second in each of these systems by a display controller that
refreshes the screen at a rate of 60 frames per second? (5 Marks)
QUESTION FIVE (20 MARKS)
a) Distinguish between the terms “Shading”, “texture mapping” and “shadows” as used in computer
graphics. (5 Marks)
b) Describe in depth, each of the components making up a computer graphic process as outlined in the
figure below.
(15 Marks)
Lighting
Rendering
Texturing
Image storage
& display
3D object
models
3D animation
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