WebGL - How to use Culling

In this episode, I discuss how to use back-face culling in WebGL and discuss why it's useful.

* Back-face Culling
* Determine whether a polygon is front or back facing. Meaning, triangle drawn clockwise or counterclockwise.
* If culling back-facing polygons (drawn counterclockwise), then it's facing away, and will not drawn.
* Makes rendering faster.

* https://github.com/davidwparker/programmingtil-webgl/tree/master/0096-culling
* https://developer.mozilla.org/en-US/docs/Web/API/WebGLRenderingContext/cullFace
* https://en.wikipedia.org/wiki/Back-face_culling

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