WebGL - How to do specular lighting

In this episode, I discuss how to compute specular lighting in WebGL.

* Specular Lighting

Resources:
* https://github.com/davidwparker/programmingtil-webgl/tree/master/0095-specular-lighting
* https://en.wikipedia.org/wiki/Specular_highlight
* http://ogldev.atspace.co.uk/www/tutorial19/tutorial19.html

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