WebGL - Intro to 3d

In this episode, I introduce 3d in WebGL. We start by using the lookAt function.

* lookAt -
// out, eye, center, up
// out = output matrix
// eye = position of the "camera", or eyes, while "looking at" the center
// center = the focal point, where we're looking
// up = the "vertical" up direction from the center

* https://github.com/davidwparker/programmingtil-webgl/tree/master/0053-intro-3d-lookat

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