Box rigging with empty groups does not work I'm trying to create an animation of folding a box. I have a model of unfolded box and armature. But when set parrent with empty groups, trere are vertex groups for only two bones of twelve. There are no doubles on model. Model is in one mesh. 
When I make my own vertex groups for every bone (with bone names), it does not work too.
What am I doing wrong?
Try using automatic weights instead. That will create the groups for you.