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Learning Processing, 2nd Edition by Daniel Shiffman

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14

Translation and Rotation (in 3D!)

What is the Matrix?

—Neo

In this chapter:

 2D and 3D translation

 Using P3D and P2D renderers

 Vertex shapes

 2D and 3D rotation

 Saving and restoring the transformation state: pushMatrix() and popMatrix()

14-1 The z-axis

As you have seen throughout this book, pixels in a two-dimensional window are described using Cartesian coordinates: an x (horizontal) and a y (vertical) position. This concept dates all the way back to Chapter 1, when I discussed thinking of the screen as a digital piece of graph paper.

In three-dimensional space (such as the actual, real-world space where you’re reading this book), a third axis (commonly referred to as the z-axis) refers to the depth of any given point. In a Processing sketch’s ...

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