mrdoob/three.js — pull request #4608 by eric79 (2014-03-25 22:32:12+00:00)
Title: Differentiate between heightfields and normalmaps and treat each appropriately

Right now the code assumes that any `bump` property is a normal map, which might not be a good assumption (it turns out not to be for some of our models). This change reads the attribute from the collada model and reacts appropriately (treating it as a height field or normal map).

@BrettASwift, thank you for your help with this fix.