mrdoob/three.js — pull request #3165 by mrspeaker (2013-03-06 13:07:10+00:00)
Title: Add a lookAwayFrom function

I'm not sure you want to go adding a bunch of helper methods to Object3d - but I've needed this one a few times: "lookAwayFrom" - look in the opposite direction of lookTo.

It just gets the vector between the origin and you, translates that point away from you, and calls lookAt to that point.