3D Math - Matrix code 7- reflection and orthographic

In this episode, I discuss reflection and orthographic projection code (projection meaning its formal definition of dimension reducing function).

Concepts:
* Orthographic projection
* Reflection

Resources:
* Code / Slides: https://github.com/davidwparker/programmingtil-3d-math/tree/master/0048-code-matrix-7
* Slides JS: https://github.com/hakimel/reveal.js/
* Math JS: https://www.mathjax.org/
* https://en.wikipedia.org/wiki/Orthographic_projection
* https://en.wikipedia.org/wiki/Transformation_matrix
* https://en.wikipedia.org/wiki/3D_projection

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