[vtkusers] PyQt VTK on OSX only show up in the lower left quarter of the display window

[Bill Q]

Hi All,
I encountered a wired problem while using Python 2.7, PyQT5.6 and VTK7.1 on
OSX. The render window only take the lower left quarter of the entire
display window. While I tried the same code on windows with same versions
of libs, it worked fine. The code is as following:

from PyQt5.QtWidgets import *import vtkfrom
vtk.qt.QVTKRenderWindowInteractor import
QVTKRenderWindowInteractorimport sys
class Ui_MainWindow(object):
   def setupUi(self, MainWindow):
       MainWindow.setObjectName("MainWindow")
       MainWindow.resize(603, 553)
       self.centralWidget = QWidget(MainWindow)
       self.gridlayout = QGridLayout(self.centralWidget)
       self.vtkWidget = QVTKRenderWindowInteractor(self.centralWidget)
       self.gridlayout.addWidget(self.vtkWidget, 0, 0, 100, 100)
       self.buttonLeft = QPushButton("Left")
       self.gridlayout.addWidget(self.buttonLeft, 96,48,1,1)
       self.buttonRight = QPushButton("Right")
       self.gridlayout.addWidget(self.buttonRight, 96,52,1,1)
       self.buttonUp= QPushButton("Up")
       self.gridlayout.addWidget(self.buttonUp, 94,50,1,1)
       self.buttonDown = QPushButton("Down")
       self.gridlayout.addWidget(self.buttonDown, 98,50,1,1)
       self.buttonFire = QPushButton("Fire Torpedo")
       self.gridlayout.addWidget(self.buttonFire, 95,50,3,1)
       MainWindow.setCentralWidget(self.centralWidget)

class SimpleView(QMainWindow):

   def __init__(self, parent = None):
       QMainWindow.__init__(self, parent)
       self.ui = Ui_MainWindow()
       self.ui.setupUi(self)
       self.ren = vtk.vtkRenderer()
       self.ui.vtkWidget.GetRenderWindow().AddRenderer(self.ren)
       self.iren = self.ui.vtkWidget.GetRenderWindow().GetInteractor()

       # Create source
       source = vtk.vtkSphereSource()
       source.SetCenter(0, 0, 0)
       source.SetRadius(5.0)

       # Create a mapper
       mapper = vtk.vtkPolyDataMapper()
       mapper.SetInputConnection(source.GetOutputPort())

       # Create an actor
       actor = vtk.vtkActor()
       actor.SetMapper(mapper)

       self.ren.AddActor(actor)
if __name__ == "__main__":

   app = QApplication(sys.argv)
   window = SimpleView()
   window.show()
   window.iren.Initialize() # Need this line to actually show the
render inside Qt
   sys.exit(app.exec_())


You may find the screen captures from SO:
http://stackoverflow.com/questions/42620354/pyqt-vtk-on-osx-only-show-up-in-the-lower-left-of-the-display-window

Many thanks.


Bill
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