Generating control rig blueprint graphs in C++

Development Programming & Scripting C++
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I’m interested in procedurally generating a control rig blueprint from my own file format, but I’m stuck on the process of attaching a custom UControlRigGraph to my blueprint.

My UControlRigBlueprint is being generated by a standard UFactory:


    virtual UObject* FactoryCreateNew(...) override

    {

        ...

        UControlRigBlueprint* ControlRigBlueprint = CastChecked<UControlRigBlueprint>(FKismetEditorUtilities::CreateBlueprint(ParentClass, InParent, Name, BTYPE_Normal, UControlRigBlueprint::StaticClass(), CallingContext;

        UControlRigGraph* RigGraph = NewObject<UControlRigGraph>();

        // Populate the graph with nodes, e.g.

        // RigGraph->AddNode(NewNode);

        ...

        // then somehow attach the RigGraph to the blueprint

        ...

        // profit!

        return ControlRigBlueprint;

    }

There are methods to get existing rig graphs from a blueprint:


TArray<UEdGraph*> Graphs;

ControlRigBlueprint->GetAllGraphs(Graphs);

but when I first create the blueprint it’s treated as data only and thus has no embedded graphs.

So my question is: can I generate a control rig graph myself and attach it to a control rig blueprint?

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2

This turned out to be easier than expected, URigVMController is the way to go for modifying a graph.

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3

A usage example to make things clearer:

URigVMController* Controller = ControlRigBlueprint->Controller;
Controller->AddStructNodeFromStructPath("/Script/ControlRig.RigUnit_BeginExecution", "Execute");
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