[SOLVED] SofaPython3 pygame rendering example not working

[beichun]

Hi. I am running the pygame example of SofaPython3 plugin and got the following error:

Exception in thread Thread-1:
Traceback (most recent call last):
  File "/usr/lib/python3.7/threading.py", line 926, in _bootstrap_inner
    self.run()
  File "/usr/lib/python3.7/threading.py", line 870, in run
    self._target(*self._args, **self._kwargs)
  File "/home/beichun/my-sofa/SofaPython3/examples/pygame_renderingloop/backend_pygame.py", line 27, in startUI
    fct(display, time)
  File "/home/beichun/my-sofa/SofaPython3/examples/pygame_renderingloop/backend_pygame.py", line 35, in draw
    Sofa.Simulation.glewInit()
AttributeError: module 'Sofa.Simulation' has no attribute 'glewInit'

Is there a quick fix to this? Thanks.

[Hugo]

Hey @beichun

I have not tried this example yet. I will test it and give you feedback.

Which branch of SOFA/SofaPython3 are you using?

Best,

Hugo

[beichun]

Hi @Hugo,

Thanks for your reply.
I’m using the master branch for both SOFA and SofaPython3.

[beichun]

Hi, any updates on this?
I saw the pygame example is removed from SofaPython3 repo. I wonder if there is any workaround if I still want to use the same feature.

[jnbrunet]

Hey @beichun

We removed this example since it was broken and to fix it would required us to pull GUI dependencies from SOFA into the bindings of sofa::simulation only to initalize GL (see here).

For now, if you want to make it work, you can create c++ bindings that does just that: initialize glew and call sofa::simulation::draw() whenever you need the scene to be draw in your qt context.

There has been a recent PR here that isolate OpenGL code from SOFA into a single module. It would therefore be possible to add bindings for this specific module in SofaPython3 without creating a dependency between the binding of sofa::simulation and OpenGl. This is however not in our development plan for SP3 and would require someone from the community to spend some of its time on this.

I hope that answers your question.
J-N

[psomers]

Hey @jnbrunet

Thanks for clearing this up. For the convenience of those that find this thread and want to do their own hack before someone adds proper bindings, here is what I did:

in SofaPython3\bindings\Sofa\src\SofaPython3\Sofa\Simulation\Submodule_Simulation.cpp add

#ifndef SOFA_NO_OPENGL
#include <sofa/gl/DrawToolGL.h>
#endif

and

#ifndef SOFA_NO_OPENGL
    simulation.def("draw", [](Node* n){
        auto* vparam = sofa::core::visual::VisualParams::defaultInstance();
        vparam->drawTool() = new sofa::gl::DrawToolGL();
        vparam->setSupported(sofa::core::visual::API_OpenGL);
        sofa::simulation::getSimulation()->draw(vparam, n);
    });

    simulation.def("glewInit", []()
    {
        glewInit();
    });
#endif

in SofaPython3\bindings\Sofa\src\SofaPython3\Sofa\Simulation\CMakeLists.txt add

find_package(Sofa.GL REQUIRED)

# in the SP3_add_python_module call:
DEPENDS      SofaCore SofaSimulationCore SofaSimulationGraph SofaPython3::Plugin Sofa.GL

[Hugo]

Thanks for backing up people reading your post @psomers
I close the topic in the mean if this is fine for you two. If I missed somehting, please do not hesitate to reopen it.

Best wishes,

Hugo

[psomers]

Thanks Hugo,

May be worth throwing here that a fix has been added to SofaPython3 for this.
https://github.com/sofa-framework/SofaPython3/pull/109

So definitely a closed issue.

Cheers,
Peter

[etagliabue]

Hi everyone,

I know this issue has been already closed but I have a related question. I am wondering if it would be possible to replicate the pygame example using the old SofaPython (thus, python2). As far as I understand, I could use pygame and pyopengl to create a separate OpenGL context, but I am not sure that I will be able to redirect a view of my simulation there (I am missing something that does the same as Sofa.SofaGL.draw, line 47). Do you have any suggestion or ideas?

Unfortunately, I need to stick to python2 version to interface my simulation with another program.

Thanks!

[Hugo]

Ciao @eleonora

Unfortunately, with the SofaPython plugin (2.7), no binding was existing to trigger the SOFA draw process (corresponding to: sofa::simulation::getSimulation()->draw(vparam, node);).

I guess this could be added to the SP2 API. But I am no master of python bindings 🙁
Sorry about this

Hugo

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