LDraw-like edges

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@gkjohnson
The loader is great job!

And yeah, I had the same thought about to move “discarding” to vertex shader.
So, here is two slightly different options with this approach:

  1. Uses an attribute with exact point that the last point of a line moves to:
    https://codepen.io/prisoner849/pen/BajOVgw

  2. Coordinates of the last point of a line compute in vertex shader, based on direction and distance (another attribute):
    https://codepen.io/prisoner849/pen/oNbPMzL

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