[Paraview] issue with python/qt wrapping on ubuntu: Cannot create GLX context. Aborting.

[Chris Kees]

This crash is apparently due to my attempt at off screen rendering.
Not sure if it's and os mesa problem on ubuntu or just a problem with
the way I was trying to do off screen rendering.

On Tue, Mar 6, 2012 at 1:31 PM, Chris Kees <cekees at gmail.com> wrote:
> Hi,
>
> I've got an issue running a python/QT/VTK app built from the paraview-3.14
> master branch and using qt-4.8 on ubuntu 11.04.  This has been working on
> darwin as recently as a month ago and used to work on linux. The code
> crashes with error:
>
> ERROR: In
> /home/cekees/proteus/externalPackages/ParaView/VTK/Rendering/vtkXOpenGLRenderWindow.cxx,
> line 629
> vtkXOpenGLRenderWindow (0x4ff4460): Cannot create GLX context.  Aborting.
>
> When I insert the python debugger before the main bunch of Qt setup code and
> single step through it, the code runs fine without error. If I let it
> continue and/or remove the debugging statement entirely, it gives me the
> crash. I've include the python code below. Any ideas on what is causing
> this?
>
> Thanks,
> Chris
>
>
>
>         skipComm = False
>         self.comm = comm
>         self.compManager = vtkCompositeRenderManager()
>         if not skipComm:
>             self.communicator = vtkMPICommunicator()
>             self.controller = vtkMPIController()
>
> self.controller.SetCommunicator(self.communicator.GetWorldCommunicator())
>             self.compManager.SetController(self.controller)
>             if useCoPro:
>                 self.copro =
> initializeCoProcessor(self.comm,self.controller)
>         self.myProcId = comm.rank()
>         self.numProcs = comm.size()
>         self.isMaster = comm.isMaster()
>         self.background=(1,1,1)
>         #self.background=(0,0,0)
>         self.textColor=(0,0,0)
>         self.name=name
>         #vtk object dictionary
>         self.vod={}
>         if comm.rank() == 0:
>             if hasQt:
>                 if useMainWindow:
>                     import pdb
>                     pdb.set_trace()
>                     #Qt widgets
>                     self.frameWidget = QtGui.QFrame(g.mainWindow)
>                     self.hbox = QtGui.QHBoxLayout()
>                     self.iren = QVTKRenderWindowInteractor(self.frameWidget)
>                     self.iren.Initialize()
>                     if comm.size() > 1:
>                        self.iren.Disable()
>                     else:
>
> self.iren.SetInteractorStyle(vtkInteractorStyleTrackballCamera())
>                     self.renWin = self.iren.GetRenderWindow()
>                     self.renWin.SetWindowName(name)
>                     self.hbox.addWidget(self.iren)
>                     self.frameWidget.setLayout(self.hbox)
>                     g.tabWidget.addTab(self.frameWidget,title)
>                     g.tabWidget.setCurrentWidget(self.frameWidget)
>                     screen = QtGui.QDesktopWidget().screenGeometry()
>                     size = g.mainWindow.geometry()
>                     (x,y) = (screen.width()-comm.size()*size.width())/2,
> (screen.height()-size.height())/2
>                     g.mainWindow.move(x+comm.rank()*size.width(),y)
>                     g.mainWindow.show()
>                 else:
>                     #self.iren =
> vtkRenderWindowInteractor()#QVTKRenderWindowInteractor()
>                     self.iren = QVTKRenderWindowInteractor()
>                     self.iren.Initialize()
>                     if comm.size() > 1:
>                        self.iren.Disable()
>                     else:
>
> self.iren.SetInteractorStyle(vtkInteractorStyleTrackballCamera())
>                     self.renWin = self.iren.GetRenderWindow()
>                     #self.renWin = self.compManager.MakeRenderWindow()
>                     #self.iren.SetRenderWindow(self.renWin)
>                     self.renWin.SetWindowName(name)
>                     self.iren.show()
>             else:
>                 self.iren = vtkRenderWindowInteractor()
>
> self.iren.SetInteractorStyle(vtkInteractorStyleTrackballCamera())
>                 self.iren.Initialize()
>                 self.renWin = self.compManager.MakeRenderWindow()
>                 self.iren.SetRenderWindow(self.renWin)
>                 self.renWin.SetWindowName(name)
>         else:
>             self.renWin = self.compManager.MakeRenderWindow()
>             self.renWin.OffScreenRenderingOn()
>