WebGL - 3d Orthographic Projection

In this episode, I discuss the projection matrix, and I introduce orthographic projections.

Concepts:
* Projection matrix
* Orthographic projection

Resources:
https://github.com/davidwparker/programmingtil-webgl/tree/master/0056-3d-projection-orthographic
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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