Segmentation Fault when addings Shadows

[Johannes Z.]

Hello,

I am trying to add Shadows to my Scene. It would overall be great if there was an example in the Python3 Plugin including shadows.

I have 2 Spotlights in my scene and it works just fine until I add an OglShadowShader. When I try to display the scene I get the following error:

########## SIG 11 – SIGSEGV: segfault ##########
74: sofa::helper::BackTrace::dump – 0x7ffb5e075f2073: sofa::helper::BackTrace::sig – 0x7ffb5e0760a072: seh_filter_exe – 0x7ffbac0b0cc071: seh_filter_exe – 0x7ffbac0b0cc070: _C_specific_handler – 0x7ffba889e2f069: _chkstk – 0x7ffbae2f1fb068: RtlRaiseException – 0x7ffbae2a102067: KiUserExceptionDispatcher – 0x7ffbae2f0bd066: memcpy – 0x7ffba88912f065: sofa::component::visualmodel::LightManager::makeShadowMatrix – 0x7ffb163b451064: sofa::component::visualmodel::LightManager::fwdDraw – 0x7ffb163b319063: sofa::simulation::VisitorScheduler::doExecuteVisitor – 0x7ffb5dd62d6062: sofa::simulation::VisualDrawVisitor::processNodeTopDown – 0x7ffb5dd633b061: sofa::simulation::graph::DAGNode::executeVisitorTreeTraversal – 0x7ffb8a0a7c7060: sofa::simulation::graph::DAGNode::doExecuteVisitor – 0x7ffb8a0a6ec059: sofa::simulation::DefaultVisualManagerLoop::drawStep – 0x7ffb5dd3097058: sofa::simulation::Simulation::draw – 0x7ffb5dd5898057: PyInit_SofaGL – 0x7ffb7820990056: PyInit_SofaGL – 0x7ffb7820990055: PyMethodDef_RawFastCallKeywords – 0x7ffb4cf1cce054: PyMethodDef_RawFastCallKeywords – 0x7ffb4cf1cce053: PyEval_EvalFrameDefault – 0x7ffb4cf1db3052: PyFunction_FastCallDict – 0x7ffb4cf070a051: PyMethodDef_RawFastCallDict – 0x7ffb4cf05e6050: PyObject_Call – 0x7ffb4cefae4449: PyObject_Call – 0x7ffb4cefae4448: PyObject_Call – 0x7ffb4cefae4447: PyObject_Call – 0x7ffb4cefae4446: QOpenGLWidget::redirected – 0x7ffb3d0646d045: QOpenGLWidget::redirected – 0x7ffb3d0646d044: QWidget::event – 0x7ffb3d03788043: QWidget::event – 0x7ffb3d03788042: QApplicationPrivate::notify_helper – 0x7ffb3d01488041:
QApplication::notify – 0x7ffb3d01216040: PyInit_QtWidgets – 0x7ffb3d696fb039: QCoreApplication::notifyInternal2 –
0x7ffb3dbf2a1038: QWidgetPrivate::sendPaintEvent – 0x7ffb3d04234037: QOpenGLWidget::resizeEvent – 0x7ffb3d064a1036: QOpenGLWidget::resizeEvent – 0x7ffb3d064a1035: QWidget::event – 0x7ffb3d03788034: QWidget::event – 0x7ffb3d03788033: QApplicationPrivate::notify_helper – 0x7ffb3d01488032: QApplication::notify – 0x7ffb3d01216031: PyInit_QtWidgets – 0x7ffb3d696fb030: QCoreApplication::notifyInternal2 – 0x7ffb3dbf2a1029: QWidgetPrivate::sendPendingMoveAndResizeEvents – 0x7ffb3d0423a028: QWidgetPrivate::show_helper – 0x7ffb3d049c4027: QWidgetPrivate::setVisible – 0x7ffb3d047f5026: QWidget::setVisible – 0x7ffb3d047ef025: QWidget::setVisible – 0x7ffb3d047ef024: QWidgetPrivate::showChildren – 0x7ffb3d0498a023: QWidgetPrivate::show_helper – 0x7ffb3d049c4022: QWidgetPrivate::setVisible – 0x7ffb3d047f5021: QWidget::setVisible – 0x7ffb3d047ef020: QWidget::setVisible – 0x7ffb3d047ef019: QWidget::showFullScreen –
0x7ffb3d049b2018: PyInit_QtWidgets – 0x7ffb3d696fb017: PyMethodDef_RawFastCallKeywords – 0x7ffb4cf1cce016: PyMethodDef_RawFastCallKeywords – 0x7ffb4cf1cce015: PyEval_EvalFrameDefault – 0x7ffb4cf1db3014: PyEval_EvalCodeWithName – 0x7ffb4cf0743013: PyEval_EvalCodeEx – 0x7ffb4cf21edc12: PyEval_EvalCode – 0x7ffb4cf21ea811: PyArena_Free – 0x7ffb4cf21dd810: PyRun_FileExFlags – 0x7ffb4d085d749: PyRun_SimpleFileExFlags – 0x7ffb4d0864148: PyRun_AnyFileExFlags – 0x7ffb4d085ca47: Py_UnixMain – 0x7ffb4cfd11746: Py_UnixMain – 0x7ffb4cfd11745: PyErr_NoMemory – 0x7ffb4cf3e8a04:
PyBytes_AsString – 0x7ffb4cf223d83: Py_Main – 0x7ffb4cf211f02: Py_Main – 0x7ffb4cf211f01: BaseThreadInitThunk – 0x7ffbacdc70200: RtlUserThreadStart – 0x7ffbae2a2630

[Johannes Z.]

Here is a bit of my code to illustrate. If I leave the OglShadowShader out everything works just fine

 
self.root = SCore.Node("Root")
root.addObject("LightManager", listening=True, shadows=True, softShadows=False)
root.addObject("OglShadowShader", name="shadowShader")
endo = self.root.addChild("Endoscope")
light = endo.addChild("light")
light.addObject("SpotLight", name='spotlight', direction=f"offset_engine.positions",
                                            lookat=True,
                                            cutoff=90,  # angle in degrees
                                           position=f"@{name}_camera_system.output_position",
                                            attenuation = "0.15",
                                            shadowTextureSize="128",
                                            exponent=1, shadowsEnabled=True))

[Hugo]

Hi @cereven

This piece of code does not crash on my end (with a few modif to make it a real script):

import Sofa

def createScene(root):
    root.addObject("LightManager", listening=True, shadows=True, softShadows=False)
    root.addObject("OglShadowShader", name="shadowShader")
    endo = self.root.addChild("Endoscope")
    light = endo.addChild("light")
    light.addObject("SpotLight", name='spotlight', direction=f"offset_engine.positions",
                                            lookat=True,
                                            cutoff=90,  # angle in degrees
                                           position=f"@{name}_camera_system.output_position",
                                            attenuation = "0.15",
                                            shadowTextureSize="128",
                                            exponent=1, shadowsEnabled=True)

However, OglShadowShader is a very old component because rendering is not any more performed within SOFA but rather within Blender or Unity. A tutorial should soon come out explaining how to do such a rendering in Blender !

Best wishes,

[psomers]

Hi @Hugo,

I think the problem only occurs when using the Sofa.GL python bindings (not through runSofa). But I am very curious as to how this Blender tutorial will work. Will it retain standalone SOFA in python capabilities or will it need to be used with runSofa?

Thanks,

Peter

[Johannes Z.]

I am also very excited to see how the rendering through blender will be done 🙂

[Hugo]

Hi @psomers @cereven

It will be a starting point, a basic python tutorial but though a very useful to start from!
Stay tuned guys 😉 do not hesitate to poke me here again in one or two weeks !

Best

Hugo

[Author]

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