Quiz of the Computer Graphics

Question 1

In 3D Cohen-Sutherland, we have 6 regions which are defined by the single bit. In the 6-bit code, the 4th bit represent which plane of the view volume.

Answer 1

Above

Question 2

glScalef(sx, sy, );

Fill in the missing entries

Answer 2

1

Question 3

How many cycles does it theoretically take for a single OpenGL call?

Answer 3

1

Question 4

Consider the following set of statements:
S1: A perspective projection produces realistic views,
S2: A parallel projection preserves realistic dimensions,
S3: A perspective projection preserves realistic dimensions,
S4: A parallel projection gives a realistic representation of 3D objects

Answer 4

S3 and S4

Question 5

The endpoint of a line segment is present inside the boundary plane of view volume in 3D clipping if:

Answer 5

Ax+By+Cz+D < 0

Question 6

.________is called to ensure that all data completely processed & send to display.

Answer 6

glflush()

Question 7

The subcategories of orthographic projection are:

Answer 7

Axonometric, diametric, trimetric

Question 8

Consider the following set of statements:
S1: Random scan monitors draw a picture one line at a time,
S2: The components line of a random scan picture must be refreshed in a particular order,
S3: Raster scan monitors draw a picture one line at a time,
S4: Random scan method is well suited for displaying shadowing and color areas.
Which of the above statement(s) is/are false?

Answer 8

S2, S3, and S4

Question 9

In the mid-point ellipse drawing algorithm, for drawing an ellipse with horizontal and vertical radius as rx and ry, respectively, the initial value of the decision variable (Dinit) for the first region can be calculated using the equation:

Answer 9

Dinit = (ry^2) – ((rx^2)*ry) + ((rx^2)/4)

Question 10

Which function is used to draw OpenGL primitives?

Answer 10

glVertex()

Question 11

What is the need to clear a buffer?

Answer 11

to reset the buffer

Question 12

glOrtho is used to _______

Answer 12

set the extents and behavior of coordinates

Question 13

What is the correct order of operations of the OpenGL graphics pipeline?

Answer 13

model view transformation, projection transformation, divide by w, viewport transform

Question 14

If the logical AND of the endpoint codes is NOT zero, the line can be trivially rejected

Answer 14

true

Question 15

What does a pixel mask mean?

Answer 15

strings of 1’s and 0’s

Question 16

In graphics, the number of vanishing points depends on

Answer 16

A vanishing point is a point on the image plane of a perspective drawing where the two-dimensional perspective projections (or drawings) of mutually parallel lines in three-dimensional space appear to converge

Question 17

about z-buffer algorithm

Answer 17

No limitation on the number of objects

Question 18

Which of the following graphic primitives are considered as the basic building blocks of computer graphics? (a)Points (b)Lines (c)Polylines (d)Polygons Codes :

Answer 18

Points and lines

Question 19

The term Phong associated with

Answer 19

Shading

Question 20

Give the number of principal vanishing point(s) along with their direction for the standard perspective transformation:

Answer 20

only in the K direction

Question 21

Which of the following statements is/are True regarding the solution to the visibility problem in 3D graphics ?
S1 : The Painter’s algorithm sorts polygons by depth and then paints (scan - converts) each Polygon on to the screen starting with the nearest polygon.
S2 : Backface Culling refers to eliminating geometry with back facing normals. Code

Answer 21

S2 only