text: #!/usr/bin/python3
  #
  # Copyright (c) 2014-2022 The Voxie Authors
  #
  # Permission is hereby granted, free of charge, to any person obtaining a copy
  # of this software and associated documentation files (the "Software"), to deal
  # in the Software without restriction, including without limitation the rights
  # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  # copies of the Software, and to permit persons to whom the Software is
  # furnished to do so, subject to the following conditions:
  #
  # The above copyright notice and this permission notice shall be included in
  # all copies or substantial portions of the Software.
  #
  # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  # THE SOFTWARE.
  #
  
  
  import scipy as sp
  import numpy as np
  import scipy.ndimage as spim
  import voxie
  
  args = voxie.parser.parse_args()
  context = voxie.VoxieContext(args)
  instance = context.createInstance()
  
  if args.voxie_action != 'RunFilter':
      raise Exception('Invalid operation: ' + args.voxie_action)
  
  with context.makeObject(context.bus, context.busName, args.voxie_operation, ['de.uni_stuttgart.Voxie.ExternalOperationRunFilter']).ClaimOperationAndCatch() as op:
      inputData = op.GetInputData('de.uni_stuttgart.Voxie.Input').CastTo(
          'de.uni_stuttgart.Voxie.VolumeData')
      outputPath = op.Properties['de.uni_stuttgart.Voxie.Output'].getValue('o')
  
      inputDataVoxel = inputData.CastTo('de.uni_stuttgart.Voxie.VolumeDataVoxel')
  
      xDimension = op.Properties['de.uni_stuttgart.Voxie.Filter.ChordFilter.xDimension'].getValue(
          'b')
      yDimension = op.Properties['de.uni_stuttgart.Voxie.Filter.ChordFilter.yDimension'].getValue(
          'b')
      zDimension = op.Properties['de.uni_stuttgart.Voxie.Filter.ChordFilter.zDimension'].getValue(
          'b')
  
      with inputDataVoxel.GetBufferReadonly() as inputArray:
          with op.GetOutputVolumeDataVoxelLike(outputPath, inputDataVoxel, type=('uint', 8, 'native')) as data:
              with data.CreateUpdate() as update, data.GetBufferWritable(update) as outputBuffer:
  
                  spacing = op.Properties['de.uni_stuttgart.Voxie.Filter.ChordFilter.Spacing'].getValue(
                      'x') * 2
  
                  outputBuffer.array[:] = sp.zeros_like(
                      inputDataVoxel[:].shape[0], dtype=int)
  
                  if xDimension:
                      outputBuffer.array[:, ::4 + spacing, ::4 + spacing] = 1
                  if yDimension:
                      outputBuffer.array[::4 + spacing, :, 2::4 + spacing] = 2
                  if zDimension:
                      outputBuffer.array[2::4 + spacing, 2::4 + spacing, :] = 3
  
                  outputBuffer.array[:] *= inputDataVoxel[:]
  
                  version = update.Finish()
  
                  result = {}
                  result[outputPath] = {
                      'Data': voxie.Variant('o', data._objectPath),
                      'DataVersion': voxie.Variant('o', version._objectPath),
                  }
                  op.Finish(result)
                  version._referenceCountingObject.destroy()
  
      context.client.destroy()
  