mrdoob/three.js — pull request #4987 by okready (2014-06-25 18:48:41+00:00)
Title: Support for separate alpha map textures.

Added support for using a separate alpha map with MeshBasicMaterial, MeshLambertMaterial, and MeshPhongMaterial, and updated the OBJ converter to set materials as transparent if an alpha map is defined.