Cannot Import mesh into Mechanical

[szilveszter31]

🔍 Before submitting the issue

• I have searched among the existing issues
• I am using a Python virtual environment

🐞 Description of the bug

Dear all,

I could create the composite layer structure on my shell in PyACP but when I'm trying to Import the final mesh with the composite properties into Mechanical it gives me this error:

I have checked my working folder, and everything was sucsessfully exported (.cdb, .h5, .mat). The example I am using is from the website (From title: Import mesh, materials and plies into Mechanical):
https://acp.docs.pyansys.com/version/stable/examples/workflows/06-cdb-to-pymechanical-workflow.html

and my modell is this:

Please let me know if you have any idea how to solve this.

Thanks in advance.

📝 Steps to reproduce

pyacp.mechanical_integration_helpers.import_acp_mesh_from_cdb(
mechanical=mechanical, cdb_path=working_dir_path / cdb_filename
)

💻 Which operating system are you using?

Windows

📀 Which ANSYS version are you using?

24R2

🐍 Which Python version are you using?

3.9

📦 Installed packages

_MultiThreadedRendezvous                  Traceback (most recent call last)
Cell In[19], line 1
----> 1 pyacp.mechanical_integration_helpers.import_acp_mesh_from_cdb(
      2     mechanical=mechanical, cdb_path=working_dir_path / cdb_filename
      3 )

File c:\AppData\Local\Programs\Python\Python312\Lib\site-packages\ansys\acp\core\mechanical_integration_helpers.py:94, in import_acp_mesh_from_cdb(mechanical, cdb_path)
     91     raise ValueError(f"The CDB file extension must be '.cdb', not '{cdb_path.suffix}'.")
     92 cdb_path_str = str(cdb_path)
---> 94 mechanical.run_python_script(
     95     textwrap.dedent(
     96         f"""\
     97         initial_geometry_ids = {{obj.ObjectId for obj in Model.Geometry.Children}}
     98 
     99         model_import = Model.AddGeometryImportGroup().AddModelImport()
    100         model_import.ModelImportSourceFilePath = {cdb_path_str!r}
    101         model_import.ProcessValidBlockedCDBFile = False
    102         model_import.ProcessModelData = False
    103         model_import.Import()
    104 
    105         final_geometry_ids = {{obj.ObjectId for obj in Model.Geometry.Children}}
    106         new_geometry_ids = final_geometry_ids - initial_geometry_ids
    107         if len(new_geometry_ids) != 1:
    108             raise ValueError("Expected 1 new geometry object, but found {{}}.".format(len(new_geometry_ids)))
...
_MultiThreadedRendezvous: <_MultiThreadedRendezvous of RPC that terminated with:
	status = StatusCode.UNKNOWN
	details = "Expected 1 new geometry object, but found 3."
	debug_error_string = "UNKNOWN:Error received from peer  {grpc_message:"Expected 1 new geometry object, but found 3.", grpc_status:2, created_time:"2025-04-16T10:30:26.2652229+00:00"}"

[greschd]

Thanks for the bug report @szilveszter31!

I could reproduce the problem, and developed a tentative fix.

Would you mind installing the version including the fix with the following command, to see if it also covers your case?

pip install 'ansys-acp-core[all]@git+https://github.com/ansys/pyacp@fix/pymechanical_multi_part_import'

[szilveszter31]

Thank for reaching me out @greschd !

I installed the version with your command but unfortunately it didn't work for me.
I got the same error message again.

[greschd]

I got the same error message again.

Is it the exact same error message, or Expected 1 body, but got <..> (note 'body' instead of 'geometry')?

• If it's the exact same, I think something went wrong with installing the feature branch
  • maybe the pip install command was not executed in the same virtual environment that the script was run with?
  • maybe there was an error while installing - could you share the output of the pip install command?
• If it's a different error message: would you be able to share the .cdb file, or a simplified version thereof (either publicly here, or privately to dominik.gresch@ansys.com)?

[szilveszter31]

You were right about installing the feature branch. Let me explain.

First I put your command into my Jupyternotebook and run the whole script then I got the error message: "Expected 1 new geometry object, but found 3." and checked the output of the installation and found this:

I restarted my kernel, also my computer, and it did not change anything.

Now I run the script block by block by hand but the installation command was executed only in the terminal.
The error message is: "Expected 1 body, but got 0."

So I will attach my cdb file also via email.