PyPrimeMesh fails on STEP files

[ThomasAuzinger]

🔍 Before submitting the issue

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

🐞 Description of the bug

I am using PyPrimeMesh (i.e., from ansys.meshing import prime) in a Python script to mesh CAD models.

For an extremely simple model (i.e., a cube), this import works for an x_t file but does not for the corresponding STEP file.

While the x_t import happens rather quickly in a few seconds, the STEP import hangs for >1min and finally reports ansys.meshing.prime.internals.error_handling.PrimeRuntimeError: CAD import failed.

Note that the server, which I start with "%AWP_ROOT251%\meshing\Prime\runPrime.bat" server -np 1 --ip 127.0.0.1 --port 50057 is functional the whole time and does not crash. After the failed STEP import, I can still successfully import an x_t file without having to restart the server.

Could you perhaps send me a basic Python script that shows how to import a trivial cube model from a STEP file?

📝 Steps to reproduce

script-and-data.zip

1. Add the Trivial_Slab.step and Trivial_Slab.x_t files into a ./data directory.
2. Add the meshing_test.py file into a ./src dirctory.
3. Run the script and see that it successfully import the .x_t CAD model but fails on the subsequent import of the 'identical' .step model.

💻 Which operating system are you using?

Windows

📀 Which ANSYS version are you using?

2025 R1

🐍 Which Python version are you using?

3.12

📦 Installed packages

aiohappyeyeballs==2.6.1
aiohttp==3.11.16
aiosignal==1.3.2
annotated-types==0.7.0
ansys-acp-core==0.1.0
ansys-additive-core==0.19.1
ansys-additive-widgets==0.2.1
ansys-api-acp==0.2.0
ansys-api-additive==2.2.1
ansys-api-dbu==0.3.13
ansys-api-dyna==0.4.2
ansys-api-edb==1.0.10
ansys-api-fluent==0.3.35
ansys-api-geometry==0.4.42
ansys-api-mapdl==0.5.2
ansys-api-mechanical==0.1.2
ansys-api-meshing-prime==0.1.4
ansys-api-modelcenter==0.3.1
ansys-api-platform-instancemanagement==1.1.2
ansys-api-pyensight==0.4.7
ansys-api-sherlock==0.1.35
ansys-api-systemcoupling==0.2.0
ansys-api-tools-filetransfer==0.1.1
ansys-api-workbench==0.2.0
ansys-conceptev-core==0.8
ansys-dpf-composites==0.6.2
ansys-dpf-core==0.13.4
ansys-dpf-post==0.9.2
ansys-dyna-core==0.7.1
ansys-dynamicreporting-core==0.9.0
ansys-edb-core==0.1.9
ansys-engineeringworkflow-api==0.1.0
ansys-fluent-core==0.29.0
ansys-geometry-core==0.9.1
ansys-grantami-bomanalytics==2.2.0
ansys-grantami-bomanalytics-openapi==3.1.0
ansys-grantami-jobqueue==1.1.0
ansys-grantami-recordlists==1.3.0
ansys-grantami-serverapi-openapi==4.0.0
ansys-hps-client==0.9.1
ansys-mapdl-core==0.68.6
ansys-mapdl-reader==0.54.2
ansys-math-core==0.2.2
ansys-mechanical-core==0.11.13
ansys-mechanical-env==0.1.9
ansys-mechanical-stubs==0.1.6
ansys-meshing-prime==0.7.0
ansys-modelcenter-workflow==0.1.1
ansys-motorcad-core==0.7.0
ansys-openapi-common==2.2.2
ansys-optislang-core==0.9.4
ansys-platform-instancemanagement==1.1.2
ansys-pyensight-core==0.9.10
ansys-pythonnet==3.1.0rc6
ansys-rocky-core==0.3.2
ansys-seascape==0.2.0
ansys-sherlock-core==0.8.2
ansys-simai-core==0.2.6
ansys-sound-core==0.1.3
ansys-systemcoupling-core==0.8.0
ansys-tools-filetransfer==0.1.1
ansys-tools-local-product-launcher==0.1.1
ansys-tools-path==0.7.1
ansys-tools-visualization-interface==0.8.3
ansys-turbogrid-api==0.4.4
ansys-turbogrid-core==0.4.1
ansys-units==0.4.0
ansys-workbench-core==0.8.0
anyio==4.9.0
appdirs==1.4.4
asgiref==3.8.1
asttokens==3.0.0
attrs==24.2.0
backoff==2.2.1
bcrypt==4.3.0
beartype==0.19.0
bleach==6.2.0
bokeh==3.4.3
build==1.2.2.post1
cachetools==5.5.2
certifi==2025.1.31
cffi==1.17.1
charset-normalizer==3.4.1
click==8.1.8
clr_loader==0.2.7.post0
colorama==0.4.6
contourpy==1.3.1
cryptography==44.0.2
cycler==0.12.1
dataclasses-json==0.6.7
decorator==5.2.1
defusedxml==0.7.1
Deprecated==1.2.18
dill==0.3.9
Django==4.2.20
django-guardian==2.4.0
djangorestframework==3.16.0
docker==7.1.0
elementpath==4.8.0
executing==2.2.0
fabric==3.2.2
filelock==3.18.0
flexcache==0.3
flexparser==0.4
fonttools==4.57.0
fpdf2==2.8.2
frozenlist==1.5.0
geomdl==5.3.1
google-api-core==2.24.2
google-api-python-client==2.166.0
google-auth==2.38.0
google-auth-httplib2==0.2.0
googleapis-common-protos==1.69.2
grpcio==1.67.1
grpcio-health-checking==1.62.3
grpcio-status==1.62.3
h11==0.14.0
hollerith==0.6.0
httpcore==1.0.7
httplib2==0.22.0
httpx==0.28.1
idna==3.10
importlib_metadata==8.6.1
invoke==2.2.0
ipython==9.0.2
ipython_pygments_lexers==1.1.1
jedi==0.19.2
Jinja2==3.1.6
joblib==1.4.2
jsonschema==4.23.0
jsonschema-specifications==2024.10.1
kiwisolver==1.4.8
linkify-it-py==2.0.3
lxml==5.3.1
Markdown==3.7
markdown-it-py==3.0.0
MarkupSafe==3.0.2
marshmallow==3.26.1
marshmallow-oneofschema==3.1.1
matplotlib==3.10.1
matplotlib-inline==0.1.7
mdit-py-plugins==0.4.2
mdurl==0.1.2
more-itertools==10.6.0
msal==1.32.0
msal-extensions==1.3.1
msgpack==1.1.0
multidict==6.2.0
mypy-extensions==1.0.0
networkx==3.4.2
nltk==3.9.1
numpy==2.2.4
overrides==7.7.0
packaging==24.2
pandas==2.2.3
panel==1.4.4
param==2.2.0
paramiko==3.5.1
parso==0.8.4
patsy==1.0.1
pillow==11.1.0
Pint==0.24.4
platformdirs==4.3.7
plumbum==1.9.0
pooch==1.8.2
prompt_toolkit==3.0.50
propcache==0.3.1
proto-plus==1.26.1
protobuf==4.25.6
psutil==7.0.0
pure_eval==0.2.3
pyaedt==0.15.0
pyansys==2025.1.3
pyansys-tools-report==0.8.2
pyansys-tools-variableinterop==0.1.1
pyansys-tools-versioning==0.6.0
pyasn1==0.6.1
pyasn1_modules==0.4.2
pycparser==2.22
pydantic==2.10.6
pydantic_core==2.27.2
pyedb==0.37.0
pygltflib==1.16.3
Pygments==2.19.1
pygranta==2025.1.0
pyiges==0.3.1
PyJWT==2.10.1
PyNaCl==1.5.0
pyparsing==3.2.3
pypiwin32==223
pypng==0.20220715.0
pyproject_hooks==1.2.0
Pyro5==5.15
pyspnego==0.11.2
python-dateutil==2.9.0.post0
python-dotenv==1.1.0
python-pptx==0.6.19
pytwin==0.7.0
pytz==2025.2
pyvista==0.44.2
pyviz_comms==3.0.4
pywin32==310
PyYAML==6.0.2
referencing==0.35.1
regex==2024.11.6
requests==2.32.3
requests-negotiate-sspi==0.5.2
requests-toolbelt==1.0.0
requests_ntlm==1.3.0
rpds-py==0.24.0
rpyc==6.0.1
rsa==4.9
rtree==1.4.0
scikit-rf==1.6.2
scipy==1.15.2
scooby==0.10.0
semver==3.0.4
serpent==1.41
setuptools==78.1.0
six==1.17.0
sniffio==1.3.1
sqlparse==0.5.3
sseclient-py==1.8.0
sspilib==0.2.0
stack-data==0.6.3
statsmodels==0.14.4
tabulate==0.9.0
toml==0.10.2
tomli==2.2.1
tomli_w==1.2.0
tornado==6.4.2
tqdm==4.67.1
traitlets==5.14.3
trame==3.8.1
trame-client==3.6.1
trame-server==3.4.0
trame-vtk==2.8.15
trame-vuetify==2.9.0
transformations==2025.1.1
truststore==0.10.1
typing-inspect==0.9.0
typing_extensions==4.13.1
tzdata==2025.2
tzlocal==5.3.1
uc-micro-py==1.0.3
uritemplate==4.1.1
urllib3==2.3.0
usd-core==24.8
vtk==9.3.1
wakepy==0.10.1
wcwidth==0.2.13
webencodings==0.5.1
websockets==15.0.1
wheel==0.45.1
WMI==1.5.1
wrapt==1.17.2
wslink==2.3.3
XlsxWriter==3.2.2
xmlschema==3.4.5
xyzservices==2025.1.0
yarl==1.18.3
zipp==3.21.0

[waltersma]

Hi @ThomasAuzinger,

I am not able to reproduce the error on my machine and your script works ok. I think this is related to your specific installation and system setup. Can you review your installation and see if there are any problems. Look at the cad configuration you have done for and see if the cad reader routes are working correctly in the native applications as expected. Check you can load the file as expected in the applications you wish to use.

(Cc @ansutremel, @prajaktmahajan )