Send to UE: unsupported operand type(s) for +: 'set' and 'str'

[DanMcLaughlin]

Doing an export, looks like a formatting problem for error reporting, trying to figure what the original issue is that caused this. Also looks to be something related to the new export method.

• Addon: Send to Unreal
• Steps to Reproduce the Problem: Pipeline > Export > Send to Unreal
• Error Log:

  Error: Python: Traceback (most recent call last):
  File "C:\Users\Dan\AppData\Roaming\Blender Foundation\Blender\3.4\scripts\addons\send2ue\operators.py", line 71, in modal
  raise error
  File "C:\Users\Dan\AppData\Roaming\Blender Foundation\Blender\3.4\scripts\addons\send2ue\operators.py", line 61, in modal
  function(*args, **kwargs)
  File "C:\Users\Dan\AppData\Roaming\Blender Foundation\Blender\3.4\scripts\addons\send2ue\core\export.py", line 222, in export_mesh
  export_file(properties, lod)
  File "C:\Users\Dan\AppData\Roaming\Blender Foundation\Blender\3.4\scripts\addons\send2ue\core\export.py", line 164, in export_file
  export_fbx_file(file_path, export_settings)
  File "C:\Users\Dan\AppData\Roaming\Blender Foundation\Blender\3.4\scripts\addons\send2ue\core\export.py", line 83, in export_fbx_file
  io.fbx.export(
  File "C:\Users\Dan\AppData\Roaming\Blender Foundation\Blender\3.4\scripts\addons\send2ue\core\io\fbx.py", line 522, in export
  export_fbx_bin.save(self, bpy.context, **keywords)
  File "C:\Program Files\WindowsApps\BlenderFoundation.Blender_3.4.1.0_x64__ppwjx1n5r4v9t\Blender\3.4\scripts\addons\io_scene_fbx\export_fbx_bin.py", line 3240, in save
  ret = save_single(operator, context.scene, depsgraph, filepath, **kwargs_mod)
  File "C:\Program Files\WindowsApps\BlenderFoundation.Blender_3.4.1.0_x64__ppwjx1n5r4v9t\Blender\3.4\scripts\addons\io_scene_fbx\export_fbx_bin.py", line 3131, in save_single
  fbx_objects_elements(root, scene_data)
  File "C:\Program Files\WindowsApps\BlenderFoundation.Blender_3.4.1.0_x64__ppwjx1n5r4v9t\Blender\3.4\scripts\addons\io_scene_fbx\export_fbx_bin.py", line 2929, in fbx_objects_elements
  fbx_data_mesh_elements(objects, me_obj, scene_data, done_meshes)
  File "C:\Program Files\WindowsApps\BlenderFoundation.Blender_3.4.1.0_x64__ppwjx1n5r4v9t\Blender\3.4\scripts\addons\io_scene_fbx\export_fbx_bin.py", line 1069, in fbx_data_mesh_elements
  scene_data.settings.report(
  File "C:\Users\Dan\AppData\Roaming\Blender Foundation\Blender\3.4\scripts\addons\send2ue\core\utilities.py", line 1128, in report_error
  raise RuntimeError(message + details)
  TypeError: unsupported operand type(s) for +: 'set' and 'str'

• OS: Windows
• Addon Version: 2.3
• Blender Version: Blender 3.4
• Unreal Version: Unreal 5.1

[DanMcLaughlin]

What do you think @james-baber, any ideas? I'm not seeing it on my side.

[DanMcLaughlin]

OK, looks like it's trying to send out a warning - I've gotten this warning before with the previous plugin, I think it's coming from the Tangent Space export setting - yes unsetting that and it exports properly.

So this looks like a bug with the Blender code, it's trying to warn by errors out, James do you want to submit a patch to Blender on this or how should we proceed?

[DanMcLaughlin]

For others having trouble, best solution is to throw a triangulate operator on there

[james-baber]

Hmm ok gotcha, yea the report method was monkey patched with the one in the utilities to trick the fbx module into thinking it is still an operator to minimize having to copy over all the fbx code, so that I only had to modify the functions that needed to be modified. But looks like I was missing this usage of the report method. https://github.com/EpicGames/BlenderTools/blob/8e58fff215925710762c279e87702fa82ac2cc04/send2ue/core/io/fbx.py#L516

I think the solution would be to just check if message == {'WARNING'} and print it out but don't raise an error?

https://github.com/EpicGames/BlenderTools/blob/8e58fff215925710762c279e87702fa82ac2cc04/send2ue/core/utilities.py#L1119

[DanMcLaughlin]

Oh OK, I see, yeah seems reasonable I think, easy to test just export ngon tangent space

[james-baber]

This was fixed in the latest release. Re-open if you are still experiencing issues