Thank you so much for your replies.
@Bocheng, I created an environment following the steps
you outlined and from the GitHub page to install the
Py-DEME I followed these steps
conda install cmake
pip3 install DEME
I got these errors.
(chrono_test2) conda install cmake
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.
Are there separate steps for installing on Windows?
Best regards,
Nnamdi
On Monday, August 4, 2025 at 2:45:09 PM UTC-4
[email protected] wrote:
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
On 8/4/25 18:24, 'Dan Negrut' via ProjectChrono wrote:
That functionality for running granular problems
from python: see pyDEME,
https://github.com/projectchrono/DEM-Engine
<https://urldefense.com/v3/__https://github.com/projectchrono/DEM-Engine__;!!Mak6IKo!PkKSZCuBiSh-FgdG1GZVwOgPEWrn62SHqzHo482EL_A5V21Isb_oAn9S5AMaFqcONBr_5uh8rK27fuyFYz0y7JL9Uuc2CA$>.
We’ll probably have one integrated way to install
everything (chrono & DEM support) coming up in the
very near future – next three months, most likely.
That’ll be through conda forge, a one line command,
hopefully.
Dan
---------------------------------------------
Bernard A. and Frances M. Weideman Professor
NVIDIA CUDA Fellow
Department of Mechanical Engineering
Department of Computer Science
University of Wisconsin - Madison
4150ME, 1513 University Avenue
Madison, WI 53706-1572
608 772 0914 <tel:(608)%20772-0914>
http://sbel.wisc.edu/ <http://sbel.wisc.edu/>
http://projectchrono.org/
<https://urldefense.com/v3/__http://projectchrono.org/__;!!Mak6IKo!PkKSZCuBiSh-FgdG1GZVwOgPEWrn62SHqzHo482EL_A5V21Isb_oAn9S5AMaFqcONBr_5uh8rK27fuyFYz0y7JLqDzYZVw$>
---------------------------------------------
*From:*'Nnamdi Chikere' via ProjectChrono
<[email protected]>
*Sent:* Monday, August 4, 2025 1:14 PM
*To:* ProjectChrono <[email protected]>
*Subject:* Re: [chrono] SDL2 Library Error while
running PyChrono
Thank you very much. Adding the "/" character
resolved the issue. Does this version include the
capability to simulate granular systems on Windows
using Python?
Best regards,
Nnamdi
On Monday, August 4, 2025 at 2:07:48 PM UTC-4
[email protected] wrote:
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
<https://urldefense.com/v3/__https:/github.com/projectchrono/chrono/commit/59e3cb4ba24dbb258aa1543a971507a7d0bf2689__;!!Mak6IKo!NTQLCak0Iwl-Hfht85Jhg4qWkG-A7VWM6pEEbrx0f8_cvW7ySAQlRFoQ1N0NTjfNyeBXHkTouURQJFrnTRiy0LLg6XM$>
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
On 8/4/25 17:58, 'Nnamdi Chikere' via
ProjectChrono wrote:
Hi Bocheng,
It now works, but it broke certain parts of
my code. Seems some of the API and syntax
have changed in this version. I noticed
changes in the SCM
terrain =veh.SCMTerrain(sys)
/# rotate plane/
terrain.SetReferenceFrame(chrono.ChCoordsysd(
chrono.ChVector3d(0, scm_plane_y, 0),
chrono.QuatFromAngleX(-math.pi /2)
))
/# Previous version used:/
terrain.SetPlane(chrono.ChCoordsysd(
chrono.ChVector3d(0, scm_plane_y, 0),
chrono.QuatFromAngleX(-math.pi /2))
)
Upon updating to the new version, I am now
faced with a new error when running the
deformable soil ...
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
I have the data path correctly specified at
the top of my code using the
chrono.SetChronoDataPath()
And upon contact with the ground, the
window crashes. Do you happen to have any
fixes for this? Also, are there any other
changes to the syntax?
Best regards,
Nnamdi
On Friday, August 1, 2025 at 10:17:21 PM
UTC-4 [email protected] wrote:
Hi Nnamdi,
I hope you're doing well.
We're excited to share that we've
refactored the Conda build pipeline and
released updated distributions of
PyChrono with improved cross-platform
compatibility, which is likely to
resolve the issue you encountered.
To try out the latest release, please
create a new environment and run the
following commands (note that the
installation command on the website is
now oudated):
conda create -n chrono_test python=3.12
-c conda-forge
conda install pychrono -c projectchrono
-c dlr-sc -c conda-forge
Please let us know if there are any
remaining issues.
Best,
Bocheng Zou
On 7/31/25 00:48, Bocheng Zou wrote:
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
On 7/31/25 00:45, 'Nnamdi Chikere'
via ProjectChrono wrote:
Hello Bocheng,
Thank you for reply.
I installed PyChrono via method
C. PyChrono through Conda (ref:
https://api.projectchrono.org/pychrono_installation.html
<https://urldefense.com/v3/__https:/api.projectchrono.org/pychrono_installation.html__;!!Mak6IKo!MLRxot5akRpE7PKpP5V6eTs6EVAmfOwIgWN8nnv81XgdLQUax6qVtwZPINjM2zrnQxAA_GMxqAg8ScgcDXtHvaj1guZPig$>)
For the last step I installed
via conda install
pychrono-9.0.1-py310_5372.tar.bz2
Best regards,
Nnamdi
On Wednesday, July 30, 2025 at
12:18:25 PM UTC-4
[email protected] wrote:
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
<https://urldefense.com/v3/__https:/api.projectchrono.org/tutorial_install_chrono.html__;!!Mak6IKo!MLRxot5akRpE7PKpP5V6eTs6EVAmfOwIgWN8nnv81XgdLQUax6qVtwZPINjM2zrnQxAA_GMxqAg8ScgcDXtHvahYwqyiWQ$>)
B. Precompiled binaries for
Windows (ref:
https://projectchrono.org/download/
<https://urldefense.com/v3/__https:/projectchrono.org/download/__;!!Mak6IKo!MLRxot5akRpE7PKpP5V6eTs6EVAmfOwIgWN8nnv81XgdLQUax6qVtwZPINjM2zrnQxAA_GMxqAg8ScgcDXtHvahDjDCVhA$>)
C. PyChrono through Conda
(ref:
https://api.projectchrono.org/pychrono_installation.html
<https://urldefense.com/v3/__https:/api.projectchrono.org/pychrono_installation.html__;!!Mak6IKo!MLRxot5akRpE7PKpP5V6eTs6EVAmfOwIgWN8nnv81XgdLQUax6qVtwZPINjM2zrnQxAA_GMxqAg8ScgcDXtHvaj1guZPig$>)
Could you please specify
the way you install the
chrono? This will be
helpful for us to
investigate the issue further.
Best,
Bocheng Zou
On 7/28/25 21:22, 'Nnamdi
Chikere' via ProjectChrono
wrote:
Hello,
I have recently been
faced with an error
whenever I try to run
any Python programs in
PyChrono. Has anyone
encountered this
before? I use Visual
Studio Code and
Pychrono 9.0.1 on a
Windows PC. I followed
all the steps for
installing Pychrono in
a virtual environment.
I have tried
uninstalling and
reinstalling, but it
hasn't helped.
Everything worked fine
in the same env, this
error just appeared
suddenly. Please, I
would like some advice
on this.
Best regards
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