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()