ReadWriteVtkImageData
VTKExamples/Python//ReadWriteVtkImageData
Description
==Brief Description== Generate image data, edit data points, store and reload it.
Code
ReadWriteVtkImageData.py
import vtk
filename = "writeImageData.vti"
imageData = vtk.vtkImageData()
imageData.SetDimensions(3, 4, 5)
if vtk.VTK_MAJOR_VERSION <= 5:
imageData.SetNumberOfScalarComponents(1)
imageData.SetScalarTypeToDouble()
else:
imageData.AllocateScalars(vtk.VTK_DOUBLE, 1)
dims = imageData.GetDimensions()
# Fill every entry of the image data with "2.0"
for z in range(dims[2]):
for y in range(dims[1]):
for x in range(dims[0]):
imageData.SetScalarComponentFromDouble(x, y, z, 0, 2.0)
writer = vtk.vtkXMLImageDataWriter()
writer.SetFileName(filename)
if vtk.VTK_MAJOR_VERSION <= 5:
writer.SetInputConnection(imageData.GetProducerPort())
else:
writer.SetInputData(imageData)
writer.Write()
# Read the file (to test that it was written correctly)
reader = vtk.vtkXMLImageDataReader()
reader.SetFileName(filename)
reader.Update()
# Convert the image to a polydata
imageDataGeometryFilter = vtk.vtkImageDataGeometryFilter()
imageDataGeometryFilter.SetInputConnection(reader.GetOutputPort())
imageDataGeometryFilter.Update()
mapper = vtk.vtkPolyDataMapper()
mapper.SetInputConnection(imageDataGeometryFilter.GetOutputPort())
actor = vtk.vtkActor()
actor.SetMapper(mapper)
actor.GetProperty().SetPointSize(3)
# Setup rendering
renderer = vtk.vtkRenderer()
renderer.AddActor(actor)
renderer.SetBackground(1,1,1)
renderer.ResetCamera()
renderWindow = vtk.vtkRenderWindow()
renderWindow.AddRenderer(renderer)
renderWindowInteractor = vtk.vtkRenderWindowInteractor()
renderWindowInteractor.SetRenderWindow(renderWindow)
renderWindowInteractor.Initialize()
renderWindowInteractor.Start()