use transformix for point transform

Hello ITKElastix team,

Thank you very much for your useful library，I want to transform point set by transformix, but when i run the code and wany to load the file "outputpoints.txt", i fund the file is empty. My code is as follows.

transformix_object = itk.TransformixFilter.New(moving_image)
transformix_object.SetFixedPointSetFileName('./data/frLeftBorderT.txt')
transformix_object.SetTransformParameterObject(result_transform_parameters_coarse)
transformix_object.SetLogToConsole(True)
transformix_object.SetOutputDirectory('./transformix/')
transformix_object.UpdateLargestPossibleRegion()

# Results of Transformation
# -- Bug? -- Output is saved as .txt file in outputdirectory.
# The .GetOutput() function outputs an empty image.
output_transformix_mask = transformix_object.GetOutput()
moving_left_line = np.loadtxt('./transformix/outputpoints.txt', dtype='str')[:,27:29].astype('float64')

Start by reproducing the shown Python TransformixFilter call with frLeftBorderT.txt and the supplied transform parameters, then inspect how outputpoints.txt and GetOutput() are produced. Compare the point-set input handling with the generated output; the issue is resolved when point transformation behavior and the expected output are established or corrected.

Written by the indexing model from the issue text.