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I made an editor extension that encapsulates a lot of the craziness you are experiencing here. It has support for duplicating and editing blend...
$25 bucks spent on solving a huge workflow issue with blend trees and animator controllers is hardly a waste of money... Either way your proposed...
I created an editor that works with the animator window that has the ability to duplicate blend trees. It can also be used to re-structure blend...
I created an editor that works with the animator window to do exactly what you are looking for. It has drag and drop support for re-structuring...
Streamline the Mecanim Animator workflow! Drastically simplify the process of building animator state machines and blend trees. Anim Tree Editor...