[SOLVED] Questions regarding the installation of SofaPython3 plugin

[Mathieu]

Hello,

I managed to install sofa (v20.12, gcc7.5.0) on my Ubuntu 18.04 VM and it works properly. I want now to add the SofaPython3 plugin and I need some help. Here are questions that I have:

1) Should I use the in-tree build or the out-out-tree build ? Which method do you suggest for me as a beginner with unix system?
2) Following these instructions https://github.com/sofa-framework/SofaPython3/, I should clone the repo in CMAKE_EXTERNAL_DIRECTORIES. What does it mean exactly ? Should I clone it in the sofa-plugins($HOME/sofa-plugins) directory (where I already have SoftRobots and STLIB)?
3) Do I need to build SOFA again after having added the SofaPython3 plugin? I set SOFA_EXTERNAL_DIRECTORIES to $HOME/sofa-plugins/SoftRobots when I built SOFA.

Thank you for your precious help,
Best,
Mathieu

[Hugo]

Hi @mdubied

Sorry I was away these last days!
When you say that you installed SOFA:
– which version did you install? v20.12.00 or v20.12.01? Make sure you use the latter
– is it the sources which you compiled? or the binaries?

Best

Hugo

[Mathieu]

Hi @Hugo

As I followed the instructions of this webpage https://www.sofa-framework.org/community/doc/getting-started/build/linux/ and used ninja to build SOFA, I compiled the sources (if I understand the difference between sources and binaries correctly – I am new to unix systems). For the version, I am not really sure, as I cannot find the exact information, but I cloned the v20.12 branch of the github repository (https://github.com/sofa-framework/sofa/tree/v20.12) in $HOME/sofa/srcfile.

I hope I answered the questions. Please let me know if you need more precision.

Best,
Mathieu

[Hugo]

Yes perfect @mdubied
In the sources of SOFA ($HOME/sofa/src), could you launch: git log and share with us the output?

Best

Hugo

[Mathieu]

Here is the output:

(base) srl@ubuntu:~/sofa/src$ git log
commit c65c75e1cf1016138626f71f6938d62c6cf18726 (HEAD -> v20.12, tag: v20.12.01, origin/v20.12)
Author: Guillaume Paran <guillaume.paran@sofa-framework.org>
Date:   Fri Feb 26 16:16:31 2021 +0100

    [CMake] Bump version to v20.12.01

commit 44a50cee733a0a897dde4c0bc6017ede6a7ce470
Author: Guillaume Paran <guillaume.paran@sofa-framework.org>
Date:   Fri Feb 26 16:16:14 2021 +0100

    [Changelog] Update for v20.12.01

commit 95403c300f9142bdb31bfa36a7a528a455326a8e
Author: Damien Marchal <damien.marchal@univ-lille1.fr>
Date:   Tue Feb 23 23:30:33 2021 +0100

    [all] Fix invalid Memory access in MechanicalObject and Compliant_test (#1849)
    
    * [Compliant_test] Add scope to WriteAccessor.
    
    A write accessor is holding a pointer to the data. If the pointed data is de:

[Hugo]

Hi @mdubied
Ok so you are well using the v20.12.01 (latest release) of SOFA. Great!

1) both work well! it is really up to you!
2) Compilation guidance are available here: https://github.com/sofa-framework/SofaPython3/blob/2bbdb9b937be9926b74d4cbd88c2c93b6dfcc115/docs/sphinx/source/menu/Compilation.rst
(and this will soon be directly available in the SofaPython3 doc)

Best wishes,

Hugo

[Mathieu]

Thank you for the answers!

It seems that the export part (out-of-tree build as described in 2)) does not work for me.

I executed the installation with cmake --install .

but the next steps give me the following:

(base) srl@ubuntu:~/sofa/build/v20.12$ export SOFA_ROOT="/home/srl/sofa/build/v20.12/install"
(base) srl@ubuntu:~/sofa/build/v20.12$ SOFA_ROOT/lib/cmake/SofaFramework/SofaFrameworkTargets.cmake
bash: SOFA_ROOT/lib/cmake/SofaFramework/SofaFrameworkTargets.cmake: No such file or directory

Do you have an idea of how I should process now ?

Best,
Mathieu

[Mathieu]

EDIT:

After some iterations, I solved the problem by building SOFA (v20.12.01) again, and adding the SofaPython3 plugin path to the entry CMAKE_EXTERNAL_DIRECTORIES (just setting CMAKE_EXTERNAL_DIRECTORIES=/home/srl/sofa-plugins, as sofa-plugins include all plugins I currently use: STLIB, SoftRobots, Sofa Python3 ), after cloning the plugin as described here : https://github.com/sofa-framework/SofaPython3

Thank you for your help,

Best,
Mathieu

[vac]

Hi Hugo,

I am also new to sofa, and thanks for your instruction for the compilation at here, i finished successfully the in-tree build but still can’t import SofaRuntime in python3.8, could you give a hint which part i have missed?

My Sofa Version is v20.12.01,
Python version is 3.8.5, the default python for ubuntu 20.04.02

Best,
vac

[Hugo]

Dear @kexinwei

Welcome to SOFA then!
To run SOFA from a Python environment you should have the following variable defined:

export SOFA_ROOT=/path/to/SOFA-build
export PYTHONPATH=/path/to/SOFA/SofaPython3-build/lib/python3/site-packages
export QT_PLUGIN_PATH=$SOFA_ROOT/bin

I think it is what is missing in your case. Let me know if this helps.

Best wishes,

Hugo

[xiaochaosui]

Hi Hugo,
I figured the environment.But,I hava a problem when I import SofaRuntime.

>>> import SofaRuntime
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/root/my-sofa/build/plugins/SofaPython3/lib/python3/site-packages/SofaRuntime/__init__.py", line 7, in <module>
    from .SofaRuntime import *
ModuleNotFoundError: No module named 'SofaRuntime.SofaRuntime'

Best,
xiaochaosui

[xiaochaosui]

Hi Hugo,
I figured the environment.But,I hava a problem when I import SofaRuntime.

>>> import SofaRuntime
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/root/my-sofa/build/plugins/SofaPython3/lib/python3/site-packages/SofaRuntime/__init__.py", line 7, in <module>
    from .SofaRuntime import *
ModuleNotFoundError: No module named 'SofaRuntime.SofaRuntime'

Best,
xiaochaosui

[jnbrunet]

Hey xiaochaosui,

Could you create your own forum discussion with your issue since it doesn’t look related to the initial issue?

I will mark this thread as solved since I think @mdubied successfully made it work.

Thanks a lot

[Author]

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