WebGL - 3d Orthographic Near and Far

In this episode, I discuss the near and far values in the orthographic projection matrix.

Concepts:
* Projection matrix
* Orthographic projection

Resources:
* https://github.com/davidwparker/programmingtil-webgl/tree/master/0057-3d-orthographic-near-far
* https://en.wikipedia.org/wiki/3D_projection
* https://en.wikipedia.org/wiki/Orthographic_projection
* http://gamedev.stackexchange.com/questions/56201/opengl-understanding-the-relationship-between-model-view-and-world-matrix

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