vtkconv.py

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import vtk

def main(filenameIn,filenameOut,origin,spacing):
    r = vtk.vtkDataSetReader()
    r.SetFileName(filenameIn)
    r.Update()
    data = vtk.vtkImageData()
    data.ShallowCopy(r.GetOutput())
    data.SetOrigin(origin)
    data.SetSpacing(spacing)
    w = vtk.vtkStructuredPointsWriter()
    if vtk.VTK_MAJOR_VERSION <= 5:
        w.SetInputConnection(data.GetProducerPort())
    else:
        w.SetInputData(data)
    w.SetFileName(filenameOut)
    w.Write()