WebGL - Picking an object in 3d part 3

In this episode, I discuss how to pick an object in 3d in WebGL (yet again). This time, I dynamically send an attribute over which has the picking color.

Concepts:
* Picking an object in 3d in WebGL

Resources:
* https://github.com/davidwparker/programmingtil-webgl/tree/master/0066-picking-3

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