    volume_property = vtkVolumeProperty()
    volume_property.SetColor(volume_color)
    volume_property.SetScalarOpacity(volume_scalar_opacity)
    volume_property.SetGradientOpacity(volume_gradient_opacity)
    volume_property.SetInterpolationTypeToLinear()
    volume_property.ShadeOn()
--
volumeProperty = vtk.vtkVolumeProperty()
volumeProperty.SetScalarOpacity(opacityFunction)
volumeProperty.SetColor(colorFunction)
volumeProperty.ShadeOff()
volumeProperty.SetInterpolationTypeToLinear()
# volumeProperty.SetScalarOpacityUnitDistance(options.unit)
--
    volumeProperty = vtkVolumeProperty()
    volumeProperty.SetColor(colorFunc)
    volumeProperty.SetScalarOpacity(alphaChannelFunc)

    volumeMapper = vtkFixedPointVolumeRayCastMapper()
    volumeMapper.SetInputConnection(dataImporter.GetOutputPort())
--
    volumeProperty = vtkVolumeProperty()
    volumeProperty.SetColor(colorTransferFunction)
    volumeProperty.SetScalarOpacity(opacityTransferFunction)
    volumeProperty.ShadeOn()
    volumeProperty.SetInterpolationTypeToLinear()

