Create and edit values in child BP through python

Development Pipeline & Plugins Editor Scripting
1

Good Day,
I am trying to create a child of a BP through python, searching the documentation and not seeing anything for creation of blueprints or making a child of one. After making it i want it then edit some of the values within it.

2

I just got this working, still hardcoded values right now, but it works to generate child bps based on any blueprint class. If you’re basing off a C++ class its a bit easier.

The root class string is achieved from right-clicking the asset and copying reference.




import unreal as ue

# New Asset Name
asset_name = "AwesomeNewAsset"

# Save Path
package_path = "/Game/Lush"

# Derive a Class from a string path
root_class = '/Game/Lush/Blueprints/Placables/Prop_Base.Prop_Base'
root_class_generated = root_class + "_C"
root_class_loaded = ue.EditorAssetLibrary.load_asset(root_class)

# Derive a BlueprintGeneratedClass from a UBlueprint
# If you have a C++ class, you can replace all this with just ue.CPPCLASSNAMEHERE
parent_class = ue.get_default_object(ue.load_object(None, root_class_generated)).get_class()

# Factory Setup
factory = ue.BlueprintFactory()
factory.set_editor_property("ParentClass", parent_class)

# Get Asset Tools
asset_tools = ue.AssetToolsHelpers.get_asset_tools()

# Create Asset
childBP = asset_tools.create_asset(asset_name, package_path, root_class_loaded.static_class(), factory)
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3

Just an extra line of code to above which is helpful. After you have your childBP ref (UBlueprint) you can make it more usable with:
bp_gc = ue.EditorAssetLibrary.load_blueprint_class(childBP.get_path_name())
Which will give you the BlueprintGeneratedClass

Then if you wanted to change data on it, you can get the cdo by:
bp_cdo = ue.get_default_object(bp_gc)

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