3D Math - Quaternion code part 1

In this episode, I discuss code for quaternions. Notation, identity, negation, and rotation about an axis.

Concepts:
* Notation
* Axis-Angle Pair
* Negation
* Identity

Resources:
* Code / Slides: https://github.com/davidwparker/programmingtil-3d-math/tree/master/0049-code-quat-1
* Slides JS: https://github.com/hakimel/reveal.js/
* Math JS: https://www.mathjax.org/

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