mrdoob/three.js — pull request #5525 by titansoftime (2014-10-28 00:00:43+00:00)
Title: Bringing back functionality from GeometryUtils.merge

This change splits merge into two functions: mergeGeometry which takes THREE.Geometry as its first param and mergeMesh which emulates the old behavior of the THREE.GeomertryUtils.merge() function which allowed a THREE.Mesh object to be passed. Geometry.merge() remains for BC.