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How to Create Custom Blueprint Node:

For anyone interested. Creating custom nodes is different than simply exposing functions, but gives you much more options.

Here is another example of how to create a custom node with wild-card pins: https://github.com/EpicGames/UnrealEngine/commit/f4e55cf9d98267183ba2cfe8b25fb76e3623e370

It’s the commit of the ‘Ease’ node that has been added in 4.5