mrdoob/three.js — pull request #3629 by stephomi (2013-07-10 17:15:52+00:00)
Title: Line picking for the raycaster

The raycaster can pick lines.
It's not a color-picking based method... so it works with a 3D threshold.

A pixel-based threshold is possible but it would mean projecting all the lines' vertices on the screen and doing everything on the display space...