How to undo applied subsurf? I applied the subdivision modifier a while ago.
But Blender can't take it anymore I really need to undo it!
I already start over a bit with the project but I really do not feel like making the wings all over again and the hair....can someone help me?
There is an option that could help you to "undo" an applied subdivision surface modifier, although the best options are already said in comments (ie: a real undo before closing the file or keeping an unapplied copy of the object):



here is how it works on a simple cube