[vtkusers] New bug : Issue #17101 - vtkConnectivityFilter - SetExtractionModeToSpecifiedRegions keep points from other regions.

[Jonathan Borduas]

Hi everyone,

I added a new bug on the gitlab repo: Issue #17101

The GetNumberOfPoints is the same as before the extraction (bad), while the GetNumberOfCells has only the cell count of the specified regions (good).


Example code:

vtkSmartPointer<vtkPolyDataConnectivityFilter> connectivity = vtkSmartPointer<vtkPolyDataConnectivityFilter>::New();

connectivity->SetInputData(inputpolydata->GetOutput());

connectivity->SetExtractionModeToAllRegions();

connectivity->Update();


for (int i = 0; i < connectivity->GetNumberOfExtractedRegions(); ++i)
{
  connectivity->SetExtractionModeToSpecifiedRegions();

  connectivity->InitializeSpecifiedRegionList();

  connectivity->AddSpecifiedRegion(i);

  connectivity->Modified();

  connectivity->Update();

  vtkSmartPointer<vtkPolyData> extractedRegion = vtkSmartPointer<vtkPolyData>::New();

  extractedRegion->DeepCopy(connectivity->GetOutput());

  cout << "points extracted region: " << extractedRegion->GetNumberOfPoints() << endl;

  cout << "cells extracted region: " << extractedRegion->GetNumberOfCells() << endl;

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