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#!/usr/bin/env python
from vtkmodules.vtkIOCore import (
vtkGlobFileNames,
vtkSortFileNames,
)
from vtkmodules.vtkIOImage import vtkImageReader2
from vtkmodules.vtkInteractionImage import vtkImageViewer
import vtkmodules.vtkInteractionStyle
import vtkmodules.vtkRenderingFreeType
import vtkmodules.vtkRenderingOpenGL2
from vtkmodules.util.misc import vtkGetDataRoot
VTK_DATA_ROOT = vtkGetDataRoot()
globFileNames = vtkGlobFileNames()
globFileNames.AddFileNames(VTK_DATA_ROOT + "/Data/headsq/quarter.*[0-9]")
sortFileNames = vtkSortFileNames()
sortFileNames.SetInputFileNames(globFileNames.GetFileNames())
sortFileNames.NumericSortOn()
reader = vtkImageReader2()
reader.SetFileNames(sortFileNames.GetFileNames())
reader.SetDataExtent(0, 63, 0, 63, 1, 1)
reader.SetDataByteOrderToLittleEndian()
# set Z slice to 2: if output is not numerically sorted, the wrong
# slice will be shown
viewer = vtkImageViewer()
viewer.SetInputConnection(reader.GetOutputPort())
viewer.SetZSlice(2)
viewer.SetColorWindow(2000)
viewer.SetColorLevel(1000)
viewer.GetRenderer().SetBackground(0, 0, 0)
viewer.Render()
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