Module 1

Question 1

To draw an image, what do we start with?

Answer 1

Geometry

Question 2

Conversion of a 3D scene to s 2D image

Answer 2

Rendering

Question 3

Compute color of geometry

Answer 3

Shading

Question 4

Project geometry

Answer 4

Projection

Question 5

Clip geometry

Answer 5

Clipping

Question 6

Generate fragments from geometry

Answer 6

Rasterization

Question 7

Computer pixel colors from fragments

Answer 7

Fragment processing

Question 8

The process by which color is assigned to geometry

Answer 8

Shading

Question 9

Cut a polygon into multiple parts, such that each is entirely inside or outside the display area

Answer 9

Clip

Question 10

The process of converting a vector image (shapes) to a
raster image (dots)

Answer 10

Rasterization

Question 11

Why do we rasterize?

Answer 11

Dots are the only things modern displays can

understand

Question 12

A real value between 0.0 and 1.0, which can be used to fix the length of a line, the speed of an action, or perhaps the size of a picture

Answer 12

Valuator

Question 13

A coordinate pair (x, y) which enables the -user to point to a position on the display

Answer 13

Locator

Question 14

Identifies a portion of a picture for further processing

Answer 14

Pick

Question 15

T/F Some graphics packages allow a picture to be
defined in terms of segments, which are groups of
related graphics primitives

Answer 15

T

Question 16

What type of device is a joystick?

Answer 16

Locate

Question 17

What type of device is a trackball?

Answer 17

Valuator

Question 18

What is an example of a pick device

Answer 18

POS (Point of Sale system)

Question 19

What can give you strings of characters?

Answer 19

Keyboard

Question 20

What changes in position?

Answer 20

Mouse

Question 21

What action is the mouse most often used to perform?

Answer 21

Locate

Question 22

Provides an area on which the user can slide a stylus

Answer 22

Tablet

Question 23

What does the frame buffer store?

Answer 23

Array of pixels

Question 24

What is resolution?

Answer 24

Number of pixels

Question 25

What is depth?

Answer 25

Number of bits per pixel

Question 26

Graphics displays are either ____ devices or

____ displays

Answer 26

line-drawing, raster

Question 27

What are two examples of line drawing devices?

Answer 27

Pen plotter

Vector video device

Question 28

What is an advantage of vector displays?

Answer 28

Requires very little memory
Conceptually very simple
No aliasing on lines/curves
Refresh rate can be very high

Question 29

What are the disadvantages of vector displays?

Answer 29

Can only draw line segments

Question 30

T/F Virtually all displays used today are raster

displays

Answer 30

T

Question 31

What are the advantages of raster displays?

Answer 31

Refresh rate is not dependent on the amount of

pixels drawn

Question 32

What are the disadvantages of raster displays?

Answer 32

Need a fairly large amount of memory

Draws the whole screen at once

Need a frame buffer that can hold the information for a whole image

Aliasing

Question 33

What causes jaggies?

Answer 33

Aliasing

Question 34

T/F Aliasing is a signal processing problem

Answer 34

T

Question 35

A ____ uses a strip of photographic film, exposed by the electron beam as it sweeps over it (once) in a raster pattern

Answer 35

Film recorder