COMPUTER GRAPHICS

PART A
 
     

S. No.    Questions    Marks - 10    
1    Explain projection and differentiate parallel and perspective projections.

    
2     Explain Depth-Buffer Method in detail. Solve by www.solvezone.in contact for more detail.

     
        
3     Write steps required to draw a line from point (x,y) to (x’,y’) using Bresenham’s line drawing algorithm.

        
4    How do I perform basic viewing in 3D?      

5    How do I rotate a 2D point?

        
6    How do I do a hidden surface test (backface culling) with 2D points?

8    Give difference between Vector scan display and Raster scan display method.    
Answer:

PART B
Case Detail:  

1.    Develop the transformation for finding the reflection point w.r.t. the line ax+by+c=0

2.    Explain with examples the operation of segments.

3.    The pyramid is defined by the coordinates A(0,0,0), B(1,0,0),C(0,1,0) and D(0,0,1) is rotated 90 degrees about the line L that has direction vector V= i +j +k and passing through the origin. Find the co-ordinates of rotated figure

PART C
 
Question No: 1       
Which kind of models are made up only of quad polygons?       
           
 
multidimensional surface       
extrovert surface       
subdivision surface       
introvert surface     
           
           
Question No: 2       
A spline is a type of:       
           
 
line       
angle       
curve       
all of the above     
           
           
Question No: 3       
Which kind of models are made up of points, lines and faces?       
           
 
geometry surface       
polygonal       
introvert surface       
subdivision surface     
           
           
Question No: 4       
A transparency map is used to:       
           
 
to get bush out of office       
cover the object so you can't see it       
All of the above       
None of the above     
           
           
Question No: 5       
Output, which is made up of pictures, sounds, and video, is called.       
           
 
COM       
Hard copy       
Graphics       
Multimedia     
           
           
Question No: 6       
In “Utah” graphics, lights are simplified in order to approximate light/matter interaction with a minimum amount of work.  Which of the following is NOT true about the simplifications made in “Utah” graphics lights?       
           
 
Light intensity and color are folded into one value.       
Lights are assumed to have zero size       
Spotlights can not be handled       
Soft shadows can not be handled     
           
           
Question No: 7       
The Phong reflection model simplifies light-matter interactions into (essentially) 4 vectors and a number of constants.  Each piece of the Phong model uses different vectors and constants.  Which portion does NOT include taking a dot product?       
           
 
Ambient       
Diffuse       
Specular       
All of the above     
           
           
Question No: 8       
The Phong reflection model simplifies light-matter interactions into (essentially) 4 vectors and a number of constants.  Which piece of the Phong model is responsible for giving spheres their bright white spots?       
           
 
Ambient       
Diffuse       
Specular       
All of the above     
           
           
Question No: 9       
The Phong reflection model simplifies light-matter interactions into (essentially) 4 vectors and a number of constants.  Which of the following is NOT a vector needed for the Phong reflection model?       
           
 
Surface Normal       
Direction to Viewer       
Direction to Material Center       
Direction to Light     
           
           
Question No: 10       
In the Phong Reflection model, ambient light is the same everywhere.       
           
 
true       
false       
All of the above       
None of the above     
           
           
Question No: 11       
Answer all questions.
Tick mark (√) the most appropriate answer
 
                             Which of the following is NOT true about quaternions?
 
        
           
 
They are made up of 4 numbers       
They should alw
ys be normalized to length 1       
They can be used to represent all affine transforms       
They can be used to define the rotation of an object.     
           
           
Question No: 12       
 Which of the following does NOT figure into the Field of View of a pinhole camera?       
           
 
The direction of projection       
The distance from the center of projection to the projection plane       
The size of the projection plane       
All of the above     
           
           
Question No: 13       
 This projection technique has the direction of projection perpendicular to the viewing plane, but the viewing direction is NOT perpendicular to one of the principle faces.       
           
 
Orthographic Parallel Projection       
Axonometric Parallel Projection       
Oblique Parallel Projection       
All of the above     
           
           
Question No: 14       
This projection technique does NOT have the direction of projection perpendicular to the viewing plane.       
           
 
Orthographic Parallel Projection       
Axonometric Parallel Projection       
Oblique Parallel Projection       
All of the above     
           
           
Question No: 15       
This projection technique has the direction of projection perpendicular to the viewing plane, and the viewing direction is perpendicular to one of the principle faces.       
           
 
Orthographic Parallel Projection       
Axonometric Parallel Projection       
Oblique Parallel Projection       
All of the above     
           
           
Question No: 16       
 When transforming a random Axis-Aligned Bounding Box defined by the points (nearx, neary, nearz) and (farx, fary, farz) to the standard orthographic viewing box, which affine transforms are used?       
           
 
shear and translation       
rotation and scale       
scale and shear       
translation and scale     
           
           
Question No: 17       
In class, we discussed how the image of the Double Eagle Tanker was obtained for the large poster in the main hall of Sitterson.  It required rendering several perspective images using OpenGL.  Which of the following was NOT a step required in that process?       
           
 
handling projection planes non-orthogonal to the viewing direction       
cutting a single projection plane into many separate projection planes       
rotating the viewing direction to be the same as the –z direction       
handling several different centers of projection     
           
           
Question No: 18       
In OpenGL, there are several different matrices.  We have discussed two of them in class.  Which one of the below would be used in conjunction with a glRotatef function call?       
           
 
GL_MODELVIEW       
GL_PROJECTION       
All of the above       
None of the above     
           
           
Question No: 19       
In OpenGL, there are several different matrices.  We have discussed two of them in class.  Which one of the below would be used in conjunction with glFrustum?       
           
 
GL_MODELVIEW       
GL_PROJECTION       
All of the above       
None of the above     
           
           
Question No: 20       
Which of the following is the order that geometry operations are performed in OpenGL (where we read the order from left to right)?       
           
 
GL_PROJECTION ? GL_MODELVIEW ? Perspective division       
GL_MODELVIEW ? GL_PROJECTION ? Perspective division       
Perspective division ? GL_PROJECTION ? GL_MODELVIEW       
GL_MODELVIEW ? Perspective division ? GL_PROJECTION     
           
           
Question No: 21       
 Bitmap graphics is--       
           
 
Resolution independent       
Graphical dependent       
Resolution dependent       
Graphical independent     
           
           
Question No: 22       
What is another name for bitmap graphics?              
           
 
Bitmap graphics       
Raster graphics       
Jpeg graphics       
png graphics     
           
           
Question No: 23       
What is another name for vector graphics?       
           
 
Spline       
Splines       
Raster       
Vector     
           
           
Question No: 24       
Vector graphics are--       
           
 
Jpeg       
Bitmap       
Resolution dependent       
Resolution independent     
           
           
Question No: 25       
Which of the following is a common size for digital video?       
           
 
720 pixels x 480 pixels       
800 pixels x 600 pixels       
1020 pixels x 480 pixels       
400 pixels x 300 pixels     
           
           
Question No: 26       
What is the RGB equivalent of the color red?       
           
 
0, 255, 0       
255, 0, 0       
255, 255, 0       
0, 0, 0     
           
           
Question No: 27       
An alpha channel determines:           
           
 
the viability of a bitmap image       
the transparency of a bitmap image       
the opacity of a bitmap image       
none of the above     
           
           
Question No: 28       
Standard 35mm film runs at what frame rate?       
           
 
24 fps       
35 fps       
29 fps       
12 fps     
           
           
Question No: 29       
After Effects, position, rotation, opacity and scale are examples of what?       
           
 
keyframe channel       
rotation channels       
animation channels       
opacity channels     
           
           
Question No: 30       
Which is an example of rendering?               
           
 
rendering       
taking all of the changes and showing them in a visible image       
taking all of the calculations from a program to make an image       
all of the above     
           
           
Question No: 31       
Which of the following is a method of compressing a movie?       
           
 
MPEG       
MOV       
encoding       
compressing     
           
           
Question No: 32       
Which kind of models are resolution independent?       
           
 
z-axis       
NURBS       
polygonal       
tesselation     
           
           
Question No: 33       
The 3D Cartesian coordinate system adds which axis to the 2D axes?       
           
 
z-axis       
y-axis       
x-axis       
c-axis     
           
           
Question No: 34       
The 3D Cartesian coordinate system adds which axis to the 2D axes?       
           
 
z-axis       
y-axis       
x-axis       
c-axis     
           
           
Question No: 35       
Where do all three axes meet?         
           
 
side       
bottom       
top       
origin     
           
           
Question No: 36       
In the Phong reflection model, there are 3 constants (a, b, c) which are used to
     describe the qualities of which of the following phenomena?       
           
 
The material reaction to ambient, diffuse and specular light (respectively)       
The amount to perturb reflection vectors as they are mirrored across the normal       
The size (in each dimension) which the light is assumed to have       
The attenuation of a point light source with distance     
           
           
Question No: 37       
when obtaining normals for a triangle, which of the following mathematical constructs is NOT used?       
           
 
Point-Point subtraction       
Vector dot products       
Vector cross products       
Vector normalization     
           
           
Question No: 38       
A touch screen is recommended for       
           
 
pressure-sensitive drawing and painting       
projects that track users       
program involving public input and simple tasks       
day-to-day computer work     
           
           
Question No: 39       
The transformation wherein the object is first rotated about x-axis and then about y-axis is       
           
 
instant       
rotation       
shearing       
tilting     
           
           
Question No: 40       
The sizes of graphics files for use on the web are reduced using       
           
 
Compression       
Depression       
mpression       
Compilation