mrdoob/three.js — pull request #4890 by gero3 (2014-06-06 09:04:36+00:00)
Title: Make visibility useful in hierarchy.

This makes it possible to hide the parent and all children based on the parents.visiblitlity.
We could also add a property on the scene object to switch between the 2 systems if it would be nessecary.