3D Math - How to scale in any direction in 3d math

In this episode, I discuss scaling, and how to compute the matrices needed to scale in an arbitrary direction.

Concepts:
* 3d Scaling
* 2d Scaling
* scaling in an arbitrary direction

Resources:
* https://github.com/davidwparker/programmingtil-3d-math/tree/master/0013-matrix-transformations
* Slides JS: https://github.com/hakimel/reveal.js/
* Math JS: https://www.mathjax.org/

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