Refactored upload screen preview JS code based on https://code.google.com/p/jsc3d/issues/detail?can=2&start=0&num=100&q=&colspec=ID%20Type%20Status%20Priority%20Milestone%20Owner%20Summary&groupby=&sort=&id=44 feedback, however ghosting issue when loading > 1 STL file remains.
Fixed JSC3D geometry problem with multiple models.