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param3d_extract2.py
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param3d_extract2.py
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#!/usr/bin/env python3
# coding: utf-8
#
# Christophe le Bourlot christophe.le-bourlot <> insa-lyon.fr
#
from vtk import *
import numpy as np
def param3d_split(
file_name,
voids_to_extract=None):
# Read the source file.
reader = vtkUnstructuredGridReader()
reader.SetFileName(file_name)
reader.Update() # Needed because of GetScalarRange
output = reader.GetOutput()
cell_data = output.GetCellData() #This contains just the cells data
# get the first array: 'value'
array0 = cell_data.GetArray(0)
cells_per_array = set() # a set of values
for i in range(output.GetNumberOfCells()):
cells_per_array.add(array0.GetValue(i))
if voids_to_extract is None:
voids_to_extract = cells_per_array
else:
voids_to_extract = set(voids_to_extract)
assert len(voids_to_extract) == len(voids_to_extract.intersection(cells_per_array))
calculator = vtkArrayCalculator()
calculator.SetFunction("1")
calculator.SetResultArrayName('azerty')
calculator.SetAttributeModeToUsePointData()
calculator.SetInputData(output)
calculator.Update()
output2 = calculator.GetOutput()
# prepare the threshold
threshold = vtkThreshold()
threshold.AddInputData(output2)
threshold.SetInputArrayToProcess(0, 0, 0, vtkDataObject.FIELD_ASSOCIATION_CELLS, 0)
# Prepare the writer
writer = vtkUnstructuredGridWriter()
writer.SetInputData(threshold.GetOutput())
#acquisition_step = np.ones(output.GetNumberOfCells())
#scalar3_array = util.numpy_support.numpy_to_vtk(acquisition_step)
#scalar3_array.SetName('scalar3')
#cell_data.AddArray(scalar3_array)
print("Extracted voids ids: {}".format(voids_to_extract))
# for each void, select the cells and create a new vtk file
for value in voids_to_extract:
# threshold the void
threshold.ThresholdBetween(value, value)
threshold.Update()
# save the data
writer.SetFileName("output/param3d_extract_void_{}.vtk".format(value))
writer.Update()
if __name__ == "__main__":
# The source file
file_name = "ex/ex2_param3d.vtk"
param3d_split(file_name)
param3d_split(file_name, [114])