"ImportError: No module named util"

[RCBurrito]

I've been having this issue and I'm unsure on how to resolve it. I'm not the most experienced with python, so I'm sure this issue is pretty simple.

I'm trying to import a camera from blender to UE4.
I get this error when copying and pasting the import script from blender to UE4:

LogPython: Error: Traceback (most recent call last):
LogPython: Error: File "C:/Users/xxx/Downloads/ExportedFbx/ImportSequencerScript.py", line 8, in
LogPython: Error: import importlib.util
LogPython: Error: ImportError: No module named util

Not sure what information is needed but:

python version 3.13.1
UE4 version 4.25.4
Blender version 3.1.0
Blender Plugin version: "unrealengine_assets_exporter_4.3.10-blender_4.2"

[xavier150]

Thanks for the report, I will check this issue soon.

[xavier150]

Hey @RCBurrito thanks for the report sadly I don't know how fix that issue in Unreal Engine 4.25

Unreal Engine use Python 2.7.x and my addon use importlib.util included in Python 3.1

Unreal Engine Version	Python Version
4.25	Python 2.7.x
4.26 - 4.27	Python 3.7.x
5.0 - 5.2	Python 3.9.x
5.4 - 5.5	Python 3.11.x

The import script of my addon load and run bfu_import_module using importlib.util.

I read it possible to have the same result using imp but the loaded module don't import all sub modules in the file __init__.py like bpl.

LogPython: Error: Traceback (most recent call last):
LogPython: Error:   File "P:/GitHubBlenderAddon/Blender-For-UnrealEngine-Addons/docs/Examples/ExportedFbx/ImportAssetScript.py", line 61, in <module>
LogPython: Error:     RunImportScriptWithJsonData()
LogPython: Error:   File "P:/GitHubBlenderAddon/Blender-For-UnrealEngine-Addons/docs/Examples/ExportedFbx/ImportAssetScript.py", line 56, in RunImportScriptWithJsonData
LogPython: Error:     module.run_from_asset_import_script(import_file_path)
LogPython: Error:   File "C:\Users\BleuRaven\AppData\Roaming\Blender Foundation\Blender\4.3\extensions\user_default\unrealengine_assets_exporter\run_unreal_import_script.py", line 61, in run_from_asset_import_script
LogPython: Error:     module = import_unreal_module()
LogPython: Error:   File "C:\Users\BleuRaven\AppData\Roaming\Blender Foundation\Blender\4.3\extensions\user_default\unrealengine_assets_exporter\run_unreal_import_script.py", line 50, in import_unreal_module
LogPython: Error:     module = imp.load_module(module_name, file, module_file, ('.py', 'r', imp.PY_SOURCE))
LogPython: Error:   File "C:\Users\BleuRaven\AppData\Roaming\Blender Foundation\Blender\4.3\extensions\user_default\unrealengine_assets_exporter\bfu_import_module\__init__.py", line 21, in <module>
LogPython: Error:     from . import bpl
LogPython: Error: ValueError: Attempted relative import in non-package

Here are my tests if anyone has any ideas.

asset_import_script.py

def RunImportScriptWithJsonData():
    # Path to the JSON data file
    json_data_file = 'ImportAssetData.json'
    dir_path = os.path.dirname(os.path.realpath(__file__))
    import_file_path = os.path.join(dir_path, json_data_file)
    
    # Load JSON data
    assets_data = JsonLoadFile(import_file_path)
    file_path = os.path.join(assets_data["info"]["addon_path"],'run_unreal_import_script.py')

    if sys.version_info >= (3, 1):
        import importlib.util
        spec = importlib.util.spec_from_file_location("__import_assets__", file_path)
        module = importlib.util.module_from_spec(spec)
        spec.loader.exec_module(module)
    else:
        # Dynamically load the script using imp
        import imp
        module_name = "__import_assets__"
        with open(file_path, 'r') as file:
            module = imp.load_module(module_name, file, file_path, ('.py', 'r', imp.PY_SOURCE))
        
    # Run script module function
    module.run_from_asset_import_script(import_file_path)

run_unreal_import_script.py

def import_unreal_module():
    # Get the script directory
    script_dir = os.path.dirname(os.path.abspath(__file__))
    module_name = "bfu_import_module"
    module_file = os.path.join(script_dir, module_name, "__init__.py")

    if sys.version_info >= (3, 1):
        import importlib.util
        spec = importlib.util.spec_from_file_location(module_name, module_file)
        module = importlib.util.module_from_spec(spec)
        sys.modules[module_name] = module
        spec.loader.exec_module(module)
    else:
        # Dynamically load the script using imp
        import imp
        with open(module_file, 'r') as file:
            module = imp.load_module(module_name, file, module_file, ('.py', 'r', imp.PY_SOURCE))
        main_module.__name__ = original_name

    # Return the imported module
    return module