Requires a StaticMeshEditorSubsystem

Development Programming & Scripting
1

I’m not sure why I’m getting this error:

LogPython: Error: TypeError: descriptor 'get_number_materials' requires a 'StaticMeshEditorSubsystem' object but received a 'StaticMesh'

in documentation mentioned that Editor Scripting Utilities Plugin is deprecated and suggesting to use Static Mesh Editor Subsystem

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Link

and looking at StaticMeshEditorSubsystem documentation. it has same requirements.

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Link

but then it throw an error that I should pass StaticMeshEditorSubsystem?
Any idea what is StaticMeshEditorSubsystem?

here is my python code: (Also I’m running this in UE5)

import unreal

editor_util = unreal.EditorUtilityLibrary()
selected_assets = editor_util.get_selected_assets()

for asset in selected_assets:
    # # deprecated
    # result = unreal.EditorStaticMeshLibrary.get_number_materials(asset)

    # new class
    result = unreal.StaticMeshEditorSubsystem.get_number_materials(asset)
2

yeah, i’m curious as well

3

Still no answer? I too am getting this warning in UE5 when using EditorStaticMeshLibrary:

LogPython: Warning: <string>:1: DeprecationWarning: EditorStaticMeshLibrary: Function 'get_lod_build_settings' on 'EditorStaticMeshLibrary' is deprecated: The Editor Scripting Utilities Plugin is deprecated - Use the function in Static Mesh Editor Subsystem

When I switch over to use StaticMeshEditorSubsystem I get this error:

Error: TypeError: descriptor 'get_lod_build_settings' requires a 'StaticMeshEditorSubsystem' object but received a 'StaticMesh'

The unreal.StaticMeshEditorSubsystem documentation says the first argument should be a StaticMesh, which I am passing it.

4

You can try this:
default_object = unreal.StaticMeshEditorSubsystem.get_default_object()
default_object.get_lod_build_settings

1 Like
5

Thank you for that tip! I got this to work:

selected_assets = unreal.EditorUtilityLibrary.get_selected_assets()
asset = selected_assets[0]
# After switching from deprecated EditorStaticMeshLibrary to StaticMeshEditorSubsystem,
# we have to get the default static mesh object first and get_lod_build_settings from it
default_staticmesh_object = unreal.StaticMeshEditorSubsystem.get_default_object()
lod_build_settings = default_staticmesh_object.get_lod_build_settings(asset, 0)
# make a change to one of its properties
lod_build_settings.set_editor_property('generate_lightmap_u_vs', False)
# now write the lod_build_settings back to the asset
default_staticmesh_object.set_lod_build_settings(asset, 0, lod_build_settings)
1 Like
6

Ouch, that is really bad that we have to use CDO of an object to use its functions in Commandlet mode.
Epic, please fix that!