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$>.
We’ll probably have one integrated way to install everything (chrono &
DEM support) coming up in the very near future – next three months,
most likely. That’ll be through conda forge, a one line command,
hopefully.
Dan
---------------------------------------------
Bernard A. and Frances M. Weideman Professor
NVIDIA CUDA Fellow
Department of Mechanical Engineering
Department of Computer Science
University of Wisconsin - Madison
4150ME, 1513 University Avenue
Madison, WI 53706-1572
608 772 0914
http://sbel.wisc.edu/ <http://sbel.wisc.edu/>
http://projectchrono.org/
<https://urldefense.com/v3/__http://projectchrono.org/__;!!Mak6IKo!PkKSZCuBiSh-FgdG1GZVwOgPEWrn62SHqzHo482EL_A5V21Isb_oAn9S5AMaFqcONBr_5uh8rK27fuyFYz0y7JLqDzYZVw$>
---------------------------------------------
*From:*'Nnamdi Chikere' via ProjectChrono
<projectchrono@googlegroups.com>
*Sent:* Monday, August 4, 2025 1:14 PM
*To:* ProjectChrono <projectchrono@googlegroups.com>
*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 bzo...@wisc.edu 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 bzo...@wisc.edu
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
bzo...@wisc.edu 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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