Unreal bAutoComputeLODScreenSize in Python

mesh_asset.get_editor_property("bAutoComputeLODScreenSize")
# LogPython: Error: Exception: StaticMesh: Property 'bAutoComputeLODScreenSize' for attribute 'bAutoComputeLODScreenSize' on 'StaticMesh' is protected and cannot be read

The var bAutoComputeLODScreenSize seems to be public in the Unreal C++ source code in Engine\Source\Runtime\Engine\Classes\Engine\StaticMesh.h

#if WITH_EDITORONLY_DATA
...
public:

    int32 GetLightmapUVVersion() const
    {
        WaitUntilAsyncPropertyReleased(EStaticMeshAsyncProperties::LightmapUVVersion);
        PRAGMA_DISABLE_DEPRECATION_WARNINGS
        return LightmapUVVersion;
        PRAGMA_ENABLE_DEPRECATION_WARNINGS
    }

    /** If true, the screen sizes at which LODs swap are computed automatically. */
    UPROPERTY()
    uint8 bAutoComputeLODScreenSize : 1;

The reason you were getting the “protected and cannot be read” error is because Python reflection in Unreal Engine respects the C++ access modifiers and preprocessor directives. Since bAutoComputeLODScreenSize is within #if WITH_EDITORONLY_DATA, it’s not exposed to the Python API directly, even though it appears to be in a public: section.

But there’s a blueprint callable

#if WITH_EDITOR
    UFUNCTION(BlueprintCallable, Category = StaticMesh)
    bool IsLODScreenSizeAutoComputed() const
    {
        return bAutoComputeLODScreenSize;
    }
#endif

in Unreal Python it can be accessed with

mesh_asset.is_lod_screen_size_auto_computed()  # False

TODO hack¶

An approach that might give us access to protected vars: LLM recommend a custom C++ Unreal editor tool - untested