Hi Radu,
Thanks for reply! The default glibc version for Ubuntu20.04 is 2.31.
However instead of installing pychrono from source, now I install it from
conda and I met the error as following and my GCC version is 9.4. Any way
to solve it and I think upgrading glibc version is likely to break os?
Python 3.9.21 | packaged by conda-forge | (main, Dec 5 2024, 13:51:40)
[GCC 13.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import pychrono
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File
"/home/tong/miniconda3/envs/chrono/lib/python3.9/site-packages/pychrono/__init__.py",
line 54, in <module>
from .core import *
File
"/home/tong/miniconda3/envs/chrono/lib/python3.9/site-packages/pychrono/core.py",
line 10, in <module>
from . import _core
ImportError: cannot import name '_core' from partially initialized module
'pychrono' (most likely due to a circular import)
(/home/tong/miniconda3/envs/chrono/lib/python3.9/site-packages/pychrono/__init__.py)
>>> import _core
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ImportError: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.32' not
found (required by
/home/tong/miniconda3/envs/chrono/lib/python3.9/site-packages/_core.so)
On Sunday, January 19, 2025 at 5:06:12 AM UTC-5 Radu Serban wrote:
> Hi Tong,
>
>
>
> The reason for vehicles “floating” in certain areas is most likely due to
> the fact that they are actually interacting with the virtual SCM grid from
> a nearby deformable terrain patch. See the following discussion for
> details: https://groups.google.com/g/projectchrono/c/KfVffIkvfRs. As I
> mentioned there, I intend to provide support in Chrono for the type of
> mixed terrain you are interested in, but that may not be available for a
> while (I don’t have the bandwidth to work on this right now). In the
> meantime, I pushed an *intermediate fix* which allows the user to
> restrict the computational domain of an SCM terrain patch. See the new
> function SCMTerrain::SetBoundary
> <https://github.com/projectchrono/chrono/blob/75fb6835587d33fa1e2956f5ae40d50d5688b965/src/chrono_vehicle/terrain/SCMTerrain.h#L158>
>
> and, as an illustration of its use, uncomment line 260 in
> demo_VEH_SCMTerrain_WheeledVehicle
> <https://github.com/projectchrono/chrono/blob/75fb6835587d33fa1e2956f5ae40d50d5688b965/src/demos/vehicle/terrain/demo_VEH_SCMTerrain_WheeledVehicle.cpp#L260>
>
> .
>
>
>
> Of course, to use this new feature, you would need to start using the
> *latest* Chrono code.
>
> Note that there is no direct limitation based on the Ubuntu distro
> version. All that matters is the *version of the compiler*. Assuming you
> use GCC, the version included with Ubuntu 20.04 is GCC v. 9.3. That should
> be good enough to build the latest Chrono code and, and if it is not, it’s
> possible to upgrade your compiler version in Ubuntu 20.04.
>
>
>
> Regardless, I strongly encourage you to start using a newer version of
> Chrono (ideally, the latest in the ‘main’ git branch) as there were quite a
> few changes, improvements, and bug fixes since Chrono v. 8.
>
>
>
> --Radu
>
>
>
>
>
> *From:* [email protected] <[email protected]> *On
> Behalf Of *Tong Xu
> *Sent:* Sunday, January 19, 2025 7:22 AM
> *To:* ProjectChrono <[email protected]>
> *Subject:* [chrono] Re: Why vehicle floating in the sky?
>
>
>
> Sry, I don't test now. It seems that provided conda packages version 8.0
> or 9.0 are working on Ubuntu22.04. I only have Ubuntu20.04 now.
>
> On Sunday, January 19, 2025 at 1:17:55 AM UTC-5 [email protected]
> wrote:
>
> Does this problem persist with the current version of chrono?
>
>
>
> [email protected] schrieb am Sonntag, 19. Januar 2025 um 03:56:00 UTC+1:
>
> Thanks for asking. When I am only using one deformable terrain or
> different combined rigid terrain, it will be ok. If I combine several
> different types of deformable textures or deformable textures with rigid
> textures by multiple patches, It will definately floating in the sky. I
> doubt that it because of the AddMovingPatch() function? And I compile by
> this source code from gym-chrono repo:
> https://github.com/zzhou292/chrono/tree/feature/robot_model
> <https://urldefense.com/v3/__https:/github.com/zzhou292/chrono/tree/feature/robot_model__;!!Mak6IKo!JQOB56IhuZEWUtXi3tIvmTtskNlqVJnMGzRFovgVeyOh2nI98Y38oRfv-jFi174vozUOciDP3W0UyE0$>.
>
> Thanks a lot.
>
>
>
> Best regards,
>
> Tong
>
> On Saturday, January 18, 2025 at 1:34:17 PM UTC-5 [email protected]
> wrote:
>
> Hello,
>
>
>
> Does your vehicle still float in the sky if you use only one type of
> terrain? Either rigid or deformable?
>
>
>
> Also, what you mean by "sometimes vehicle floats in the sky"? Does that
> mean it drives fine for a while, then it floats? Or it means, you
> initialize the problem differently, sometimes it drives fine on the ground,
> but sometimes it floats?
>
>
>
> Thank you,
>
> Luning
>
> On Wednesday, January 15, 2025 at 11:47:41 PM UTC-6 [email protected]
> wrote:
>
> Hello, I have compiled chrono version 8 from source code by Ubuntu20.04. I
> also created terrain which consisted by rigid and deformable terrain
> according to multiple concatenating patches. But why sometimes vehicle
> floats in the sky. Is this because of the chrono code?
>
> Thanks a lot
>
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> <https://urldefense.com/v3/__https:/groups.google.com/d/msgid/projectchrono/ff32ad72-ed96-45f7-b338-13ecb8fca36en*40googlegroups.com?utm_medium=email&utm_source=footer__;JQ!!Mak6IKo!JQOB56IhuZEWUtXi3tIvmTtskNlqVJnMGzRFovgVeyOh2nI98Y38oRfv-jFi174vozUOciDP_s4d7uM$>
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