def __init__(self, parent=None): super(VTK_Widget1, self).__init__(parent) self.source_is_connected = False # vtk to point data self.c2p = vtk.vtkCellDataToPointData() self.opacityTransferFunction = vtk.vtkPiecewiseFunction() self.colorTransferFunction = vtk.vtkColorTransferFunction() # create a volume property for describing how the data will look self.volumeProperty = vtk.vtkVolumeProperty() self.volumeProperty.SetColor(self.colorTransferFunction) self.volumeProperty.SetScalarOpacity(self.opacityTransferFunction) self.volumeProperty.ShadeOn() self.volumeProperty.SetInterpolationTypeToLinear() # convert to unstructured grid volume self.triangleFilter = vtk.vtkDataSetTriangleFilter() self.triangleFilter.TetrahedraOnlyOn() self.triangleFilter.SetInputConnection(self.c2p.GetOutputPort()) # create a ray cast mapper self.compositeFunction = vtk.vtkUnstructuredGridBunykRayCastFunction() self.volumeMapper = vtk.vtkUnstructuredGridVolumeRayCastMapper() self.volumeMapper.SetRayCastFunction(self.compositeFunction) self.volumeMapper.SetInputConnection(self.triangleFilter.GetOutputPort()) # create a volume self.volume = vtk.vtkVolume() self.volume.SetMapper(self.volumeMapper) self.volume.SetProperty(self.volumeProperty) self.volume.VisibilityOff() # create the VTK widget for rendering self.vtkw=QVTKRenderWindowInteractor(self) self.ren = vtk.vtkRenderer() self.vtkw.GetRenderWindow().AddRenderer(self.ren) self.ren.AddVolume(self.volume) self.alphaSlider = QSlider(Qt.Horizontal) self.alphaSlider.setValue(50) self.alphaSlider.setRange(0,100) self.alphaSlider.setTickPosition(QSlider.NoTicks) self.connect(self.alphaSlider,SIGNAL("valueChanged(int)"),self.AdjustAlpha) self.alphaLabel = QLabel("alpha: ") # layout manager self.layout = QVBoxLayout() self.layout2 = QHBoxLayout() self.layout2.addWidget(self.alphaLabel) self.layout2.addWidget(self.alphaSlider) self.layout.addWidget(self.vtkw) self.layout.addSpacing(34) self.layout.addLayout(self.layout2) self.setLayout(self.layout) # initialize the interactor self.vtkw.Initialize() self.vtkw.Start()