GLXBadDrawable when using multiple QVTKRenderWindow

vtk_baddrawable.py

import sys

import vtk
from vtk.qt4.QVTKRenderWindowInteractor import *

from PySide.QtCore import *
from PySide.QtGui import *

if __name__ == '__main__':
    #Qt boilerplate
    app = QApplication(sys.argv)

    vtk_interactor1 = QVTKRenderWindowInteractor()
    vtk_interactor2 = QVTKRenderWindowInteractor()

    vtk_interactor1.Initialize()
    vtk_interactor2.Initialize()

    #Create our VTK renderer
    ren1 = vtk.vtkRenderer()
    ren2 = vtk.vtkRenderer()
    vtk_interactor1.GetRenderWindow().AddRenderer(ren1)
    vtk_interactor2.GetRenderWindow().AddRenderer(ren2)

    #A cone source
    cone = vtk.vtkConeSource()
    cone.SetResolution(8)

    coneMapper = vtk.vtkPolyDataMapper()
    coneMapper.SetInputConnection(cone.GetOutputPort())

    coneActor = vtk.vtkActor()
    coneActor.SetMapper(coneMapper)

    #Each renderer will display a cone
    ren1.AddActor(coneActor)
    ren2.AddActor(coneActor)

    vtk_interactor1.show()
    vtk_interactor2.show()

    #Render our cone
    vtk_interactor1.GetRenderWindow().Render()
    vtk_interactor2.GetRenderWindow().Render()

    app.exec_()