Unreal Engine - ExtendedStateTreeComponent

A quick extension of the Unreal Engine State Tree plugin with support for dynamically changing State Trees at runtime. Supports Blueprints as well as C++.

Epic will likely add this feature themselves in a future release, but we're 4 versions deep without support yet, so here we are!

How to set up in your project

1. Copy the ExtendedStateTree.h and ExtendedStateTree.cpp files into your project source directory
2. In the .h file, update YOURPROJECT_API to the appropriate value for your project
3. Update your .uproject or .uplugin file with the GameplayStateTree plugin dependency if you haven't already
4. Add the necessary public module dependencies to your .Build.cs file
5. Generate Visual Studio project files and build
6. Replace existing uses of the StateTreeComponent with the ExtendedStateTreeComponent

Once you're using the ExtendedStateTreeComponent, you'll have access to the GetStateTree and SetStateTree methods.

Note: If SetStateTree is called on a running tree, the tree will be stopped, swapped, and restarted.
If the tree is not running, it will not be started automatically, and you'll need to call StartLogic() manually in either Blueprints or C++.

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I may end up adding additional features and configuring this as a proper plugin. As of now, I don't believe there's enough here to justify creating an external dependency just to set state trees dynamically.