SDL2 Library Error while running PyChrono
Nnamdi Chikere
Bocheng Zou
Hi Nnamdi,
Thank you for reaching out. I'm Bocheng and I'm a UW-Madison student responsible for PyChrono distributions. Could you please clarify the specific way you install the PyChrono? We currently support three ways of installation on Windows.
A. Build from scratch using cmake (ref: https://api.projectchrono.org/tutorial_install_chrono.html)
B. Precompiled binaries for Windows (ref: https://projectchrono.org/download/)
C. PyChrono through Conda (ref: https://api.projectchrono.org/pychrono_installation.html)
Could you please specify the way you install the chrono? This will be helpful for us to investigate the issue further.
Best,
Bocheng Zou
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Nnamdi Chikere
Bocheng Zou
Hi Nnamdi,
Thank you for providing the information. The Windows conda build for PyChrono is having know issues recently. We are aware of that and it's expected to be fixed within the week. If you are in urgent need of PyChrono, I suggest you build from scratch using cmake (Method A) or use PyChrono's conda distribution on Linux.
I will keep you posted once the issue in the Windows conda distribution is fixed.
Best,
Bocheng Zou
To view this discussion visit https://groups.google.com/d/msgid/projectchrono/8b5c5803-6308-461f-a84b-24188f960344n%40googlegroups.com.
Bocheng Zou
Hi Nnamdi,
conda create -n chrono_test python=3.12 -c conda-forge
conda install pychrono -c projectchrono -c dlr-sc -c conda-forge
Bocheng Zou
Nnamdi Chikere
I have the data path correctly specified at the top of my code using the chrono.SetChronoDataPath()
Bocheng Zou
Hi Nnamdi,
Thank you for the follow up. Yes, on Apr 27, 2025, we renamed SetPlane to SetReferenceFrame. The details can be found at https://github.com/projectchrono/chrono/commit/59e3cb4ba24dbb258aa1543a971507a7d0bf2689
For the "Cannot open colormap data file C:/Users/chike/Box/TurtleRobotExperiments/Sea_Turtle_Robot_AI_Powered_Simulations_Project/NnamdiFiles/mujocotest1/chrono/data../data/colormaps/jet-table-float-0512.csv" issue, did you put a "/" character at the end of your "chrono.SetChronoDataPath()" call? For example, you need to use chrono.SetChronoDataPath("C:/Users/chike/Box/TurtleRobotExperiments/Sea_Turtle_Robot_AI_Powered_Simulations_Project/NnamdiFiles/mujocotest1/chrono/data/") instead of chrono.SetChronoDataPath("C:/Users/chike/Box/TurtleRobotExperiments/Sea_Turtle_Robot_AI_Powered_Simulations_Project/NnamdiFiles/mujocotest1/chrono/data")
Once you applied that fix, could you please update on if the window crash issue gets resolved?
Thank you very much!
Best,
Bocheng Zou
To view this discussion visit https://groups.google.com/d/msgid/projectchrono/75f5b824-28fe-44ae-95eb-8d765a9262d0n%40googlegroups.com.
Nnamdi Chikere
Dan Negrut
That functionality for running granular problems from python: see pyDEME, https://github.com/projectchrono/DEM-Engine.
We’ll probably have one integrated way to install everything (chrono & DEM support) coming up in the very near future – next three months, most likely. That’ll be through conda forge, a one line command, hopefully.
Dan
---------------------------------------------
Bernard A. and Frances M. Weideman Professor
NVIDIA CUDA Fellow
Department of Mechanical Engineering
Department of Computer Science
University of Wisconsin - Madison
4150ME, 1513 University Avenue
Madison, WI 53706-1572
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Bocheng Zou
Hi Dan and Nnamdi,
To add up, since the FSI and VSG support is not yet merged into the main branch, if you want to use the PyChrono with FSI / VSG to simulate granular terrain in addition to DEME, you need to use our special FSI version rather than the regular version I posted in previous email. The special FSI version can be installed via the following command in a NEW environment:
conda create -n chrono_test "python<3.13" -c conda-forge
conda install bochengzou::pychrono -c bochengzou -c nvidia -c
dlr-sc -c conda-forge
Best,
Bocheng
Nnamdi Chikere
Channels:
- conda-forge
- defaults
Platform: win-64
Collecting package metadata (repodata.json): done
Solving environment: done
cmake conda-forge/win-64::cmake-4.0.3-hff78f93_0
libuv conda-forge/win-64::libuv-1.51.0-hfd05255_1
Proceed ([y]/n)? y
Downloading and Extracting Packages:
Preparing transaction: done
Verifying transaction: done
Executing transaction: done
(chrono_test2) pip3 install DEME
Collecting DEME
Using cached deme-2.1.2.tar.gz (6.9 MB)
Installing build dependencies ... done
Getting requirements to build wheel ... error
error: subprocess-exited-with-error
× Getting requirements to build wheel did not run successfully.
│ exit code: 1
╰─> [33 lines of output]
Traceback (most recent call last):
File "C:\Users\chike\anaconda3\envs\chrono_test2\Lib\site-packages\pip\_vendor\pyproject_hooks\_in_process\_in_process.py", line 389, in <module>
main()
File "C:\Users\chike\anaconda3\envs\chrono_test2\Lib\site-packages\pip\_vendor\pyproject_hooks\_in_process\_in_process.py", line 373, in main
json_out["return_val"] = hook(**hook_input["kwargs"])
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\chike\anaconda3\envs\chrono_test2\Lib\site-packages\pip\_vendor\pyproject_hooks\_in_process\_in_process.py", line 137, in get_requires_for_build_wheel
backend = _build_backend()
^^^^^^^^^^^^^^^^
File "C:\Users\chike\anaconda3\envs\chrono_test2\Lib\site-packages\pip\_vendor\pyproject_hooks\_in_process\_in_process.py", line 70, in _build_backend
obj = import_module(mod_path)
^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\chike\anaconda3\envs\chrono_test2\Lib\importlib\__init__.py", line 90, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "<frozen importlib._bootstrap>", line 1387, in _gcd_import
File "<frozen importlib._bootstrap>", line 1360, in _find_and_load
File "<frozen importlib._bootstrap>", line 1310, in _find_and_load_unlocked
File "<frozen importlib._bootstrap>", line 488, in _call_with_frames_removed
File "<frozen importlib._bootstrap>", line 1387, in _gcd_import
File "<frozen importlib._bootstrap>", line 1360, in _find_and_load
File "<frozen importlib._bootstrap>", line 1331, in _find_and_load_unlocked
File "<frozen importlib._bootstrap>", line 935, in _load_unlocked
File "<frozen importlib._bootstrap_external>", line 999, in exec_module
File "<frozen importlib._bootstrap>", line 488, in _call_with_frames_removed
File "C:\Users\chike\AppData\Local\Temp\pip-build-env-pw8idr9h\overlay\Lib\site-packages\setuptools\__init__.py", line 17, in <module>
import setuptools.version
File "C:\Users\chike\AppData\Local\Temp\pip-build-env-pw8idr9h\overlay\Lib\site-packages\setuptools\version.py", line 1, in <module>
import pkg_resources
File "C:\Users\chike\AppData\Local\Temp\pip-build-env-pw8idr9h\overlay\Lib\site-packages\pkg_resources\__init__.py", line 2163, in <module>
register_finder(pkgutil.ImpImporter, find_on_path)
^^^^^^^^^^^^^^^^^^^
AttributeError: module 'pkgutil' has no attribute 'ImpImporter'. Did you mean: 'zipimporter'?
[end of output]
note: This error originates from a subprocess, and is likely not a problem with pip.
error: subprocess-exited-with-error
× Getting requirements to build wheel did not run successfully.
│ exit code: 1
╰─> See above for output.
note: This error originates from a subprocess, and is likely not a problem with pip.
Bocheng Zou
Hi Nnamdi,
Thank you for bringing that issue to our attention. The Py-DEME's building pipeline is not stable on Windows at this moment. We suggest you try to build from source or use WSL .
We will likely to bring up a conda package for PyDEME for Windows to make this process much easier this week.
If you intend to reproduce the results that you asked Harry for in another email chain, https://groups.google.com/g/projectchrono/c/fWYnvZKkT4g , Py-DEME is not required and you can just follow the instruction in Harry's github.
I will keep you posted on Py-DEME's Windows conda package.
Best,
Bocheng Zou
To view this discussion visit https://groups.google.com/d/msgid/projectchrono/8e4d2b37-ac26-40ef-9809-8001e50478e4n%40googlegroups.com.
Nnamdi Chikere
Bocheng Zou
Hi Nnamdi,
Sorry for the long delay. We have released the test version of PyDEME through conda . Please try installing the PyDEME through the following command in a NEW environment created using "conda create -n tutorial "python<3.13" -c conda-forge".
conda install bochengzou::pydeme -c bochengzou -c nvidia -c dlr-sc -c conda-forge
Let me know if you encounter any issues.
Best,
Bocheng Zou
To view this discussion visit https://groups.google.com/d/msgid/projectchrono/71da2e9a-2f84-4b75-801c-e6fbcbc5e7cbn%40googlegroups.com.
Nnamdi Chikere
To view this discussion visit https://groups.google.com/d/msgid/projectchrono/00e98387-ec34-405a-a35f-07b23a4553fb%40wisc.edu.
Nnamdi Chikere
Bocheng Zou
Hi Nnamdi,
You can run this command along with the pychrono installation command I sent to you previously in the same environment. The order doesn't matter. You can also install it in your original pychrono environment (given that the environment is clean and doesn't contain pip installed DEME package).
Please note that due to a VSG upstream issue on conda-forge, you might not be able to install pychrono in the new environment today since it requires pulling packages from conda-forge.
Best,
Bocheng Zou