February 2019
Intermediate to advanced
292 pages
6h 55m
English
Content preview from The Ray Tracer Challenge
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Chapter 3Matrices
Hey, look. That shiny red sphere from before has company now. Its friends appear to be a cigar-looking matte blue ovoid, and a squashed green plastic thing that’s tipped toward us, as if curious to see who’s looking.
Would it surprise you to learn that these are all just spheres? They’ve been moved around, scaled, and rotated a bit too, but deep down, they’re all still perfectly spherical. These transformations are all thanks to a little thing called a matrix.
A matrix is a grid of numbers that you can manipulate as a single unit. For example, here’s a 2x2 matrix. It has two rows and two columns.
And here’s a 3x5 matrix, with ...
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