Difference between revisions of "VTK/Examples/Cxx/PolyData/ExtractCellsUsingPoints"

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(Replaced content with "= '''See [https://lorensen.github.io/VTKExamples/site/Cxx/PolyData/ExtractCellsUsingPoints ExtractCellsUsingPoints] on the new [https://lorensen.github.io/VTKExamples/site...")
 
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==ExtractCellsUsingPoints.cxx==
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= '''See [https://lorensen.github.io/VTKExamples/site/Cxx/PolyData/ExtractCellsUsingPoints ExtractCellsUsingPoints] on the new [https://lorensen.github.io/VTKExamples/site/ VTKExamples website].''' =
<source lang="cpp">
 
#include <vtkSmartPointer.h>
 
#include <vtkInformation.h>
 
#include <vtkSphereSource.h>
 
#include <vtkExtractSelection.h>
 
#include <vtkSelection.h>
 
#include <vtkSelectionNode.h>
 
#include <vtkPolyData.h>
 
#include <vtkUnstructuredGrid.h>
 
#include <vtkIdTypeArray.h>
 
#include <vtkDataSetSurfaceFilter.h>
 
#include <vtkXMLPolyDataWriter.h>
 
 
 
int main(int, char *[])
 
{
 
  vtkSmartPointer<vtkSphereSource> sphereSource =
 
      vtkSmartPointer<vtkSphereSource>::New();
 
  sphereSource->Update();
 
 
 
  std::cout << "There are " << sphereSource->GetOutput()->GetNumberOfPoints()
 
    << " input points." << std::endl;
 
  std::cout << "There are " << sphereSource->GetOutput()->GetNumberOfCells()
 
    << " input cells." << std::endl;
 
 
 
  {
 
  vtkSmartPointer<vtkXMLPolyDataWriter> writer =
 
    vtkSmartPointer<vtkXMLPolyDataWriter>::New();
 
  writer->SetFileName("sphere.vtp");
 
  writer->SetInputConnection(sphereSource->GetOutputPort());
 
  writer->Write();
 
  }
 
 
 
  vtkSmartPointer<vtkIdTypeArray> ids =
 
      vtkSmartPointer<vtkIdTypeArray>::New();
 
  ids->SetNumberOfComponents(1);
 
 
 
  //set values
 
 
 
  //for(unsigned int i = 10; i < 20; i++)
 
  for(vtkIdType i = 0; i < sphereSource->GetOutput()->GetNumberOfPoints()-15; i++)
 
    {
 
    ids->InsertNextValue(i);
 
    }
 
 
 
  vtkSmartPointer<vtkSelectionNode> selectionNode =
 
      vtkSmartPointer<vtkSelectionNode>::New();
 
  selectionNode->SetFieldType(vtkSelectionNode::POINT);
 
  selectionNode->SetContentType(vtkSelectionNode::INDICES);
 
  selectionNode->SetSelectionList(ids);
 
  selectionNode->GetProperties()->Set(vtkSelectionNode::CONTAINING_CELLS(), 1);
 
 
 
  vtkSmartPointer<vtkSelection> selection =
 
      vtkSmartPointer<vtkSelection>::New();
 
  selection->AddNode(selectionNode);
 
 
 
  vtkSmartPointer<vtkExtractSelection> extractSelection =
 
      vtkSmartPointer<vtkExtractSelection>::New();
 
 
 
  extractSelection->SetInput(0, sphereSource->GetOutput());
 
  extractSelection->SetInput(1, selection);
 
  extractSelection->Update();
 
 
 
  //in selection
 
  vtkDataSet* ds = vtkDataSet::SafeDownCast (extractSelection->GetOutput());
 
  std::cout << "ds is type: " << ds->GetClassName() << std::endl;
 
  std::cout << "There are " << ds->GetNumberOfPoints() << " points in the selection." << std::endl;
 
  std::cout << "There are " << ds->GetNumberOfCells() << " cells in the selection." << std::endl;
 
 
 
  //we want the output type to match the input type (vtkPolyData)
 
  vtkSmartPointer<vtkDataSetSurfaceFilter> surfaceFilter =
 
    vtkSmartPointer<vtkDataSetSurfaceFilter>::New();
 
  surfaceFilter->SetInputConnection(ds->GetProducerPort());
 
  surfaceFilter->Update();
 
 
 
  vtkPolyData* polydata = surfaceFilter->GetOutput();
 
  std::cout << "ps is type: " << polydata->GetClassName() << std::endl;
 
  std::cout << "There are " << polydata->GetNumberOfPoints() << " points in the selection." << std::endl;
 
  std::cout << "There are " << polydata->GetNumberOfCells() << " cells in the selection." << std::endl;
 
 
 
  {
 
  vtkSmartPointer<vtkXMLPolyDataWriter> writer =
 
    vtkSmartPointer<vtkXMLPolyDataWriter>::New();
 
  writer->SetFileName("output.vtp");
 
  writer->SetInputConnection(polydata->GetProducerPort());
 
  writer->Write();
 
  }
 
  return EXIT_SUCCESS;
 
}
 
 
 
</source>
 
 
 
==CMakeLists.txt==
 
<source lang="cmake">
 
cmake_minimum_required(VERSION 2.6)
 
PROJECT(ExtractCellsUsingPoints)
 
 
 
FIND_PACKAGE(VTK REQUIRED)
 
INCLUDE(${VTK_USE_FILE})
 
 
 
ADD_EXECUTABLE(ExtractCellsUsingPoints ExtractCellsUsingPoints.cxx)
 
TARGET_LINK_LIBRARIES(ExtractCellsUsingPoints vtkHybrid)
 
 
 
 
 
</source>
 

Latest revision as of 17:54, 9 September 2019