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import argparse
import numpy as np
import vtk
from python_vtk.vtkService.vtkService import writeDataArrayToNewVtkFile
def main():
# try:
parser = argparse.ArgumentParser()
parser.add_argument("invtkfile", help="filename of input vtk mesh (VTK XML unstructured grid")
parser.add_argument("varname", help="name of cell data variable")
parser.add_argument("outvtkfile", help="filename of output vtk mesh (VTK XML unstructured grid")
args = parser.parse_args()
# deserialize raw bytes into VarDataAdd
reader = vtk.vtkXMLUnstructuredGridReader()
reader.SetFileName(args.invtkfile)
reader.Update()
mesh = reader.GetOutput()
assert isinstance(mesh, vtk.vtkUnstructuredGrid)
num_cells = mesh.GetCells().GetSize()
# write 0..N-1 into data
npdata = np.arange(0, num_cells, 0.1)
writeDataArrayToNewVtkFile(args.invtkfile, args.varname, npdata, args.outvtkfile)
print("done")
# except:
# e = sys.exc_info()[0]
# print("exception "+e)
# sys.exit(-1)
# else:
# sys.exit(0)
if __name__ == '__main__':
main()
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