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Given a filename, uses the appropriate vtkPolyData reader to read any vtkPolyData file.

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# from pathlib import Path
# from vtkmodules.vtkIOGeometry import (
#     vtkBYUReader,
#     vtkOBJReader,
#     vtkSTLReader
# )
# from vtkmodules.vtkIOLegacy import vtkPolyDataReader
# from vtkmodules.vtkIOPLY import vtkPLYReader
# from vtkmodules.vtkIOXML import vtkXMLPolyDataReader

def read_poly_data(file_name):
    if not file_name:
        print(f'No file name.')
        return None

    valid_suffixes = ['.g', '.obj', '.stl', '.ply', '.vtk', '.vtp']
    path = Path(file_name)
    ext = None
    if path.suffix:
        ext = path.suffix.lower()
    if path.suffix not in valid_suffixes:
        print(f'No reader for this file suffix: {ext}')
        return None

    reader = None
    if ext == '.ply':
        reader = vtkPLYReader(file_name=file_name)
    elif ext == '.vtp':
        reader = vtkXMLPolyDataReader(file_name=file_name)
    elif ext == '.obj':
        reader = vtkOBJReader(file_name=file_name)
    elif ext == '.stl':
        reader = vtkSTLReader(file_name=file_name)
    elif ext == '.vtk':
        reader = vtkPolyDataReader(file_name=file_name)
    elif ext == '.g':
        reader = vtkBYUReader(file_name=file_name)

    if reader:
        poly_data = reader.output
        return poly_data
        return None