looks good to me, one question, but otherwise think this is fine to go into blender after 2.64's out. http://codereview.appspot.com/6347064/diff/1/source/blender/editors/object/ob... File source/blender/editors/object/object_vgroup.c (right): http://codereview.appspot.com/6347064/diff/1/source/blender/editors/object/ob... source/blender/editors/object/object_vgroup.c:468: dmesh_src = mesh_get_derived_deform(scene, ob_src, CD_MASK_BAREMESH | CD_MASK_ORIGINDEX); do you need origindex? (I dont see it being used) - if so best explain why in a comment.