Problem when running SoftRobots python script (SOFA v18.12 on Ubuntu 16.04)

[nicklj]

Hi,

Appriciate if anyone can help on the problem. I’ve already successfully compiled SOFA with SoftRobots and STLIB. Now I’m trying to run the tutorial cases. No matter which one I use, there is always similar error and showing the messages as:

[ERROR] [PythonScript] RuntimeError: Unable to create ‘OglSceneFrame’ of type ‘OglSceneFrame’ in node ‘root’. Object type OglSceneFrame<> was not created
The object is not in the factory.

File “cablegripper.pyscn”, line 8, in createScene
MainHeader(rootNode, gravity=[0.0, -981.0, 0.0], plugins=[“SoftRobots”])
File “/opt/sofa/v18.12/lib/python2.7/site-packages/stlib/scene/mainheader.py”, line 55, in MainHeader
node.createObject(‘OglSceneFrame’, style=”Arrows”, alignment=”TopRight”)

Thank you very mcuh.

[Bruno Marques]

Hi @nicklj,

Could you tell us more about your build setting?

– Which OS are you on?
– Did you manually activate / deactivate any option in cmake besides PLUGIN_SOFAPYTHON, SOFA_BUILD_METIS?
– Could you dump the whole output of runSofa on the problematic scene?

[Wong]

Hello @bmarques

That issue is unrelated to the OS because the component OglSceneFrame has been removed from Sofa since v18.12. To avoid this issue, a simple way is to comment out the line
#node.createObject('OglSceneFrame', style="Arrows", alignment="TopRight")
at mainheader.py in Plugin STLIB. But that is not a fundamental solution.

Moreover, I have another problem that the component SparseLDLSolver always outputs the message “Failed to factorize, D(k,k) is zero”. I do not know why.

Wong

[nicklj]

@outtt Works like a charm! Thank you very much

@bmarques Thank you all the same for your kind and prompt reply.

[Damien Marchal]

Hi all,

You are totally right, thank you for opening an issue on this topic.

We will discuss the removal of the deprecated component in this PR https://github.com/sofa-framework/sofa/pull/905

The change proposed by Wong is also one option (Wong could you make a PR for that ? Otherwise I will do it).

Feel free to join.

[Wong]

Hello @damien-marchaluniv-lille1-fr

No, I can’t. But I want to ask a question. I do not know why the component SparseLDLSolver does not work on Windows.

Wong

[Damien Marchal]

Hello @outtt

I suggest we pursue the investigation about the SparseLDLSolver problem in the corresponding thread: https://www.sofa-framework.org/community/forum/topic/how-to-use-the-component-sparseldlsolver/

Damien.

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