Adding components and modifying properties of UBlueprint asset?

[HateDread]

@kamrann;380918

It sounds like you just need the functionality provided by the Blueprint/Add Script button that shows up in the details panel for a selected actor, but to control programmatically which actors to apply it to?

You can invoke this very easily through FCreateBlueprintFromActorDialog, but presumably you won’t want a dialog popping up for each actor. You can see though in CreateBlueprintFromActorDialog.cpp that it is basically just calling FKismetEditorUtilities::CreateBlueprintFromActor(). If you need more control over the blueprint, this class provides some other useful functions, such as AddComponentsToBlueprint().

Hi Kamrann!

I’ve actually already gone down this path - I’m using my own version of FCreateBlueprintFromActorDialog so I can put in my own delegates and handle things where I wish. The last part I’m having trouble with is adding components to my blueprint asset.

My static mesh components don’t come through when using CreateBlueprintFromActor, presumably because they’re added dynamically rather than via AddDefaultSubobject. When I invoke FKismetEditorUtilities::AddComponentsToBlueprint and pass in the mesh components I grab from the C++ actor that the blueprint is based off, they’re all added, but the pre-existing root component is ignored, and a new one is created that has no transform. I’ve tried manually adding the C++ actor’s root USceneComponent again via AddComponentsToBlueprint, and this works better (the root component is no longer made one of the static mesh components), but it’s still not ‘right’ (there is no way to move the root component, and it has no transform).

Is there a way to add components to the blueprint while respecting the pre-existing root component?

EDIT: There are also no visible components until I recompile the asset manually. When I do that, I’m spammed with one of these per component added:

[2015.09.18-00.19.28:471][765]LogBlueprint:Warning: USimpleConstructionScript::FixupRootNodeParentReferences() - Couldn't find native parent component 'SceneComponent' for 'StaticMeshComponent_534' in BlueprintGeneratedClass 'REINST_MyBlueprintName_Blueprint_C_41' (it may have been removed)

And this at some point:

[2015.09.18-00.19.28:481][765]LogActor:Warning: MyBlueprintName_Blueprint_C /Engine/Transient.World_2:PersistentLevel.MyBlueprintName_Blueprint_C_1 has natively added scene component(s), but none of them were set as the actor's RootComponent - picking one arbitrarily
[2015.09.18-00.19.28:507][765]PIE:Warning: Warning AttachTo: '/Engine/Transient.World_2:PersistentLevel.MyBlueprintName_Blueprint_C_1.SceneComponent' cannot be attached to itself. Aborting.