M6 - Introduction to 3D Flashcards
2 Lectures - Introduction to 3D & Intro to 3D Storage
Rendering
Process of creating a 2D image from some type of data
With 2D the data is ______-based arrays of _________ colors.
pixel-based arrays of RGB colors
With 3D, the data is primarily in the form of 2 things:
Polygon data (shapes)
Vertex Data (points to make those shapes
What axis is added in 3D
The Z-axis
What is the Z-axis
forward-backward axis
(provides depth, move “into” the scene)
What kind of coordinate system do we use for 3D?
Cartesian coordinates, with the addition of the Z-axis
3D data has to be converted to _________ data
converted to PIXEL data
Everything in 3D is made of __________________.
Polygons
How many sides does a polygon need?
3
What is the visual building block of 3D?
Polygons
Does more polygons mean more detail?
Not always, a square can be formed with 200 polygons or 2, it will have the same quality
Generally speaking “less is more” when it comes to number of polygons (EXPLAIN)
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.
What are common side counts in polygons
3, 4, N (more than 4) typically avoided
Ultimately everything is drawn in _____________ in a process called _____________.
triangles
triangulation
Triangulation
Converting / Dividing into triangles
Vertex are at a minimum a point. But what else could it contain?
position, color, normals, texture coordinates, etc
Explain the process
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
