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The best tutorial to implement a node based editor

I had lost all hope to find a good tutorial on creating a node based editor in Unity for my dialogs. Something like Mecanim, with squares and connections. So, it waslike a shoot in the dark when I made the same search again a week ago. And guess what, I found this.

I spend the friday night following it and got a small prototype working. Not just that, I also know how to customize it and add stuff. The bad news are that I forgot most of the little I knew about old Unity UI system.

This is the best tutorial I have found about this: simple and effective.
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