M6 - Introduction to 3D

Question 1

Rendering

Answer 1

Process of creating a 2D image from some type of data

Question 2

With 2D the data is ______-based arrays of _________ colors.

Answer 2

pixel-based arrays of RGB colors

Question 3

With 3D, the data is primarily in the form of 2 things:

Answer 3

Polygon data (shapes)
Vertex Data (points to make those shapes

Question 4

What axis is added in 3D

Answer 4

The Z-axis

Question 5

What is the Z-axis

Answer 5

forward-backward axis
(provides depth, move “into” the scene)

Question 6

What kind of coordinate system do we use for 3D?

Answer 6

Cartesian coordinates, with the addition of the Z-axis

Question 7

3D data has to be converted to _________ data

Answer 7

converted to PIXEL data

Question 8

Everything in 3D is made of __________________.

Answer 8

Polygons

Question 9

How many sides does a polygon need?

Answer 9

3

Question 10

What is the visual building block of 3D?

Answer 10

Polygons

Question 11

Does more polygons mean more detail?

Answer 11

Not always, a square can be formed with 200 polygons or 2, it will have the same quality

Question 12

Generally speaking “less is more” when it comes to number of polygons (EXPLAIN)

Answer 12

You don’t want to use too many polygons because it is computing expensive. But you want to use enough to to accomplish a task. Especially when dealing with animation or deformation.

Question 13

What are common side counts in polygons

Answer 13

3, 4, N (more than 4) typically avoided

Question 14

Ultimately everything is drawn in _____________ in a process called _____________.

Answer 14

triangles
triangulation

Question 15

Triangulation

Answer 15

Converting / Dividing into triangles

Question 16

_________ may be the preferred “work in progress” format or structure

Answer 16

Quads

Question 17

____________ are the “ready to be used” format

Answer 17

Triangles

Question 18

The fundamental building block of 3D

Answer 18

Vertex

Question 19

What are polygons made of ?

Answer 19

Vertex data

Question 20

What does NOT ALL TRIANGULATION IS EQUAL mean?

Answer 20

Modern systems “auto triangulate” however these may result in undesired results. Thus manual triangulation is recommended.

Question 21

What is manual triangulation?

Answer 21

Deciding how the polygons will triangulate opposed to letting the system auto triangulate and get undesired results.

Question 22

Vertex are at a minimum a point. But what else could it contain?

Answer 22

position, color, normals, texture coordinates, etc

Question 23

Graphics primitives

Answer 23

triangles, lines, and points

Question 24

What is hardware optimize for?

Answer 24

Graphic primitives

Question 25

_________________ data is sent to the graphics hardware for rendering. ____________ are the output.

Answer 25

Vertex (point) data Polygons (triangles)

Question 26

Convert 3D data into 2D data using __________________.

Answer 26

Projection

Question 27

Describe Projection

Answer 27

The process of converting 3D data into 2D data. There is an eye and items farther away from the eye(camera) appear to be closer together.

Question 28

Foreshortening

Answer 28

Items far from the eye(camera) appear closer together, and items closer to the camera move apart

Question 29

Rasterization

Answer 29

Convert 2D data into pixel colors. Generating pixel colors from polygon

Question 30

Frame buffer (output)

Answer 30

The storage location of pixels, frame buffers are copied to the displayed device to update the image.

Question 31

Explain the process

Answer 31

Application - This is what the program does (bulk of code) Geometry - Convert 3D data into 2D data using PROJECTION Rasterization - Converts 2D data into pixel colors Frame Buffer - Storage location of pixels to be displayed to update the image

Question 32

What is the camera (virtual eye)

Answer 32

The position from which we view a 3D scene (need at least 1)

Question 33

Camera moves left? The world really moves ___________.

Answer 33

right

Question 34

Camera moves forward? The world moves __________

Answer 34

back

Question 35

Camera position can be fixed, static things, or ______________ positioned

Answer 35

dynamically