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VTK-数据集vtkUnstructuredGrid

作者：喵喵爱编程 | 2024-08-18 05:05:38

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vtkunstructuredgrid

前言：本博文主要介绍vtkUnstructuredGrid的特点、结构组成，vtkUnstructuredGrid的创建方法，及其vtkUnstructuredGrid相关的接口及示例。

目录

特点

创建方法

vtkUnstructuredGrid->vtkPolyData

vtkPolyData->vtkUnstructuredGrid

vtkUnstructuredGrid相关示例

特点

非结构化网格数据，是最常见的数据集类型，它的拓扑结构和几何结构都是非结构化的，所有单元类型都可以任意组合，所有单元的拓扑结构从零维延伸至三维。如上图f所示。在VTK中，任一类型的数据集都可用非结构化网格来表达，但其储存需要大量的空间，计算时需要消耗大量的资源，除非迫不得已，一般较少使用此种类型的数据集。主要用于有限元分析，计算几何和图形表示等领域。

创建方法

  1. #include <vtkActor.h>
  2. #include <vtkCamera.h>
  3. #include <vtkCellType.h>
  4. #include <vtkDataSetMapper.h>
  5. #include <vtkNamedColors.h>
  6. #include <vtkPoints.h>
  7. #include <vtkProperty.h>
  8. #include <vtkRenderWindow.h>
  9. #include <vtkRenderWindowInteractor.h>
  10. #include <vtkRenderer.h>
  11. #include <vtkUnstructuredGrid.h>
  12.  
  13. int main( int, char *[] )
  14. {
  15.   int i;
  16.   static double x[27][3]={{0,0,0}, {1,0,0}, {2,0,0}, {0,1,0}, {1,1,0}, {2,1,0},
  17.                           {0,0,1}, {1,0,1}, {2,0,1}, {0,1,1}, {1,1,1}, {2,1,1},
  18.                           {0,1,2}, {1,1,2}, {2,1,2}, {0,1,3}, {1,1,3}, {2,1,3},
  19.                           {0,1,4}, {1,1,4}, {2,1,4}, {0,1,5}, {1,1,5}, {2,1,5},
  20.                           {0,1,6}, {1,1,6}, {2,1,6}};
  21.   static vtkIdType pts[12][8]={{0, 1, 4, 3, 6, 7, 10, 9},
  22.                                {1, 2, 5, 4, 7, 8, 11, 10},
  23.                                {6, 10, 9, 12, 0, 0, 0, 0},
  24.                                {8, 11, 10, 14, 0, 0, 0, 0},
  25.                                {16, 17, 14, 13, 12, 15, 0, 0},
  26.                                {18, 15, 19, 16, 20, 17, 0, 0},
  27.                                {22, 23, 20, 19, 0, 0, 0, 0},
  28.                                {21, 22, 18, 0, 0, 0, 0, 0},
  29.                                {22, 19, 18, 0, 0, 0, 0, 0},
  30.                                {23, 26, 0, 0, 0, 0, 0, 0},
  31.                                {21, 24, 0, 0, 0, 0, 0, 0},
  32.                                {25, 0, 0, 0, 0, 0, 0, 0}};
  33.  
  34.   
  35.   vtkSmartPointer<vtkNamedColors> colors =
  36.     vtkSmartPointer<vtkNamedColors>::New();
  37.  
  38.   vtkSmartPointer<vtkRenderer> renderer =
  39.     vtkSmartPointer<vtkRenderer>::New();
  40.  
  41.   vtkSmartPointer<vtkRenderWindow> renWin =
  42.     vtkSmartPointer<vtkRenderWindow>::New();
  43.   renWin->AddRenderer(renderer);
  44.   vtkSmartPointer<vtkRenderWindowInteractor> iren =
  45.     vtkSmartPointer<vtkRenderWindowInteractor>::New();
  46.   iren->SetRenderWindow(renWin);
  47.  
  48.   vtkSmartPointer<vtkPoints> points =
  49.     vtkSmartPointer<vtkPoints>::New();
  50.   for (i=0; i<27; i++) points->InsertPoint(i,x[i]);
  51.   
  52.   vtkSmartPointer<vtkUnstructuredGrid> ugrid =
  53.     vtkSmartPointer<vtkUnstructuredGrid>::New();
  54.   ugrid->Allocate(100);
  55.   ugrid->InsertNextCell(VTK_HEXAHEDRON, 8, pts[0]);
  56.   ugrid->InsertNextCell(VTK_HEXAHEDRON, 8, pts[1]);
  57.   ugrid->InsertNextCell(VTK_TETRA, 4, pts[2]);
  58.   ugrid->InsertNextCell(VTK_TETRA, 4, pts[3]);
  59.   ugrid->InsertNextCell(VTK_POLYGON, 6, pts[4]);
  60.   ugrid->InsertNextCell(VTK_TRIANGLE_STRIP, 6, pts[5]);
  61.   ugrid->InsertNextCell(VTK_QUAD, 4, pts[6]);
  62.   ugrid->InsertNextCell(VTK_TRIANGLE, 3, pts[7]);
  63.   ugrid->InsertNextCell(VTK_TRIANGLE, 3, pts[8]);
  64.   ugrid->InsertNextCell(VTK_LINE, 2, pts[9]);
  65.   ugrid->InsertNextCell(VTK_LINE, 2, pts[10]);
  66.   ugrid->InsertNextCell(VTK_VERTEX, 1, pts[11]);
  67.  
  68.   ugrid->SetPoints(points);
  69.  
  70.   vtkSmartPointer<vtkDataSetMapper> ugridMapper =
  71.     vtkSmartPointer<vtkDataSetMapper>::New();
  72.   ugridMapper->SetInputData(ugrid);
  73.  
  74.   vtkSmartPointer<vtkActor> ugridActor =
  75.     vtkSmartPointer<vtkActor>::New();
  76.   ugridActor->SetMapper(ugridMapper);
  77.   ugridActor->GetProperty()->SetColor(colors->GetColor3d("Peacock").GetData());
  78.   ugridActor->GetProperty()->EdgeVisibilityOn();
  79.  
  80.   renderer->AddActor(ugridActor);
  81.   renderer->SetBackground(colors->GetColor3d("Beige").GetData());
  82.  
  83.   renderer->ResetCamera();
  84.   renderer->GetActiveCamera()->Elevation(60.0);
  85.   renderer->GetActiveCamera()->Azimuth(30.0);
  86.   renderer->GetActiveCamera()->Dolly(1.2);
  87.   
  88.   renWin->SetSize(640, 480);
  89.  
  90.   // interact with data
  91.   renWin->Render();
  92.  
  93.   iren->Start();
  94.  
  95.   return EXIT_SUCCESS;
  96. }

vtkUnstructuredGrid->vtkPolyData

  1. vtkUnstructuredGrid* unSGrid = ...
  2. vtkDataSetSurfaceFilter * filter = vtkDataSetSurfaceFilter::New();
  3. filter->SetInputData(unSGrid);
  4. filter->Update();
  5. vtkPolyData* pd = filter->GetOutput();

        使用vtkGeometryFilter方式生成，参考样例：PolyData中的GeometryFilter.

  1.   vtkSmartPointer<vtkUnstructuredGrid> unstructuredGrid = 
  2.     vtkSmartPointer<vtkUnstructuredGrid>::New();
  3.   
  4.   vtkSmartPointer<vtkGeometryFilter> geometryFilter = 
  5.     vtkSmartPointer<vtkGeometryFilter>::New();
  6.   geometryFilter->SetInputData(unstructuredGrid);
  7.   geometryFilter->Update(); 
  8.  
  9.   vtkPolyData* polydata = geometryFilter->GetOutput();
  10.  
  11.   std::cout << "Output has " << polydata->GetNumberOfPoints() << " points." << std::endl;

 

vtkPolyData->vtkUnstructuredGrid

  1. vtkUnstructuredGrid* zxCommonMethod::polyDataToUnstructuredGrid(vtkPolyData* pd)
  2. {
  3. 	if (pd == nullptr) return nullptr;
  4.  
  5. 	vtkPoints* inPts = pd->GetPoints();
  6. 	vtkIdType numPts = pd->GetNumberOfPoints();
  7. 	vtkCellArray* vertexs = pd->GetVerts();
  8. 	vtkCellArray* lines = pd->GetLines();
  9. 	vtkCellArray* polys = pd->GetPolys();
  10. 	vtkCellArray* strips = pd->GetStrips();
  11. 	vtkIdType numVertexs = pd->GetNumberOfVerts();
  12. 	vtkIdType numLines = pd->GetNumberOfLines();
  13. 	vtkIdType numPolys = pd->GetNumberOfPolys();
  14. 	vtkIdType numStrips = pd->GetNumberOfStrips();
  15. 	vtkIdType numCells = pd->GetNumberOfCells();
  16. 	if (numPts < 1 || (numVertexs + numLines + numPolys + numStrips) < 1) return nullptr;
  17.  
  18. 	vtkUnstructuredGrid* uGrid = vtkUnstructuredGrid::New();
  19. 	uGrid->SetPoints(inPts);
  20.  
  21. 	const vtkIdType* pts = nullptr;
  22. 	vtkIdType npts;
  23. 	for (vtkIdType id = 0; id < numCells; id++)
  24. 	{
  25. 		pd->GetCellPoints(id, npts, pts);
  26. 		uGrid->InsertNextCell(pd->GetCellType(id), npts, pts);
  27. 	}
  28.  
  29. 	return uGrid;
  30. }

vtkUnstructuredGrid相关示例

实例1：ClipUnstructuredGridWithPlane

该实例使用vtkTableBasedClipDataSet对vtkUnstructuredGrid数据集进行Clip。与其它Clip相关的Filter不同，vtkTableBasedClipDataSet在未Clip的部分保留原来的Cells。

输入数据：treemesh.vtk

  1. #include <vtkSmartPointer.h>
  2. #include <vtkTableBasedClipDataSet.h>
  3. #include <vtkUnstructuredGridReader.h>
  4. #include <vtkUnstructuredGrid.h>
  5. #include <vtkPlane.h>
  6. #include <vtkTransform.h>
  7.  
  8. #include <vtkActor.h>
  9. #include <vtkCamera.h>
  10. #include <vtkCellTypes.h>
  11. #include <vtkDataSetMapper.h>
  12. #include <vtkLookupTable.h>
  13. #include <vtkProperty.h>
  14. #include <vtkRenderWindow.h>
  15. #include <vtkRenderWindowInteractor.h>
  16. #include <vtkRenderer.h>
  17.  
  18. #include <vtkNamedColors.h>
  19.  
  20. int main(int argc, char *argv[])
  21. {
  22.   if (argc < 2)
  23.   {
  24.     std::cout << "Usage: " << argv[0] << " filename.vtk" << std::endl;
  25.     return EXIT_FAILURE;
  26.   }
  27.   // Create the reader for the data.
  28.   std::string filename = argv[1];
  29.   std::cout << "Loading " << filename.c_str() << std::endl;
  30.   auto reader =
  31.     vtkSmartPointer<vtkUnstructuredGridReader>::New();
  32.   reader->SetFileName(filename.c_str());
  33.   reader->Update();
  34.  
  35.   double bounds[6];
  36.   reader->GetOutput()->GetBounds(bounds);  
  37.   double center[3];
  38.   reader->GetOutput()->GetCenter(center);  
  39.  
  40.   auto colors =
  41.     vtkSmartPointer<vtkNamedColors>::New();
  42.   auto renderer = vtkSmartPointer<vtkRenderer>::New();
  43.   renderer->SetBackground(colors->GetColor3d("Wheat").GetData());
  44.   renderer->UseHiddenLineRemovalOn();
  45.  
  46.   auto renderWindow =
  47.     vtkSmartPointer<vtkRenderWindow>::New();
  48.   renderWindow->AddRenderer(renderer);
  49.   renderWindow->SetSize(640, 480);
  50.  
  51.   auto interactor =
  52.     vtkSmartPointer<vtkRenderWindowInteractor>::New();
  53.   interactor->SetRenderWindow(renderWindow);
  54.  
  55.   double xnorm[3] = {-1.0, -1.0, 1.0};
  56.  
  57.   auto clipPlane = vtkSmartPointer<vtkPlane>::New();
  58.   clipPlane->SetOrigin(reader->GetOutput()->GetCenter());
  59.   clipPlane->SetNormal(xnorm);
  60.  
  61.   auto clipper =
  62.     vtkSmartPointer<vtkTableBasedClipDataSet>::New();
  63.   clipper->SetClipFunction(clipPlane);
  64.   clipper->SetInputData(reader->GetOutput());
  65.   clipper->SetValue(0.0);
  66.   clipper->GenerateClippedOutputOn();
  67.   clipper->Update();
  68.  
  69.   auto insideMapper =
  70.     vtkSmartPointer<vtkDataSetMapper>::New();
  71.   insideMapper->SetInputData(clipper->GetOutput());
  72.   insideMapper->ScalarVisibilityOff();
  73.  
  74.   auto insideActor =
  75.     vtkSmartPointer<vtkActor>::New();
  76.   insideActor->SetMapper(insideMapper);
  77.   insideActor->GetProperty()->SetDiffuseColor(colors->GetColor3d("banana").GetData());
  78.   insideActor->GetProperty()->SetAmbient(.3);
  79.   insideActor->GetProperty()->EdgeVisibilityOn();
  80.  
  81.   auto clippedMapper =
  82.     vtkSmartPointer<vtkDataSetMapper>::New();
  83.   clippedMapper->SetInputData(clipper->GetClippedOutput());
  84.   clippedMapper->ScalarVisibilityOff();
  85.  
  86.   auto clippedActor =
  87.     vtkSmartPointer<vtkActor>::New();
  88.   clippedActor->SetMapper(clippedMapper);
  89.   clippedActor->GetProperty()->SetDiffuseColor(colors->GetColor3d("tomato").GetData());
  90.   insideActor->GetProperty()->SetAmbient(.3);
  91.   clippedActor->GetProperty()->EdgeVisibilityOn();
  92.  
  93.   // Create transforms to make a better visualization
  94.   auto insideTransform = vtkSmartPointer<vtkTransform>::New();
  95.   insideTransform->Translate(-(bounds[1] - bounds[0]) * .75, 0, 0);
  96.   insideTransform->Translate(center[0], center[1], center[2]);
  97.   insideTransform->RotateY(-120.0);
  98.   insideTransform->Translate(-center[0], -center[1], -center[2]);
  99.   insideActor->SetUserTransform(insideTransform);
  100.  
  101.   auto clippedTransform = vtkSmartPointer<vtkTransform>::New();
  102.   clippedTransform->Translate((bounds[1] - bounds[0]) * .75, 0, 0);
  103.   clippedTransform->Translate(center[0], center[1], center[2]);
  104.   clippedTransform->RotateY(60.0);
  105.   clippedTransform->Translate(-center[0], -center[1], -center[2]);
  106.   clippedActor->SetUserTransform(clippedTransform);
  107.  
  108.   renderer->AddViewProp(clippedActor);
  109.   renderer->AddViewProp(insideActor);
  110.  
  111.   renderer->ResetCamera();
  112.   renderer->GetActiveCamera()->Dolly(1.4);
  113.   renderer->ResetCameraClippingRange();
  114.   renderWindow->Render();
  115.   renderWindow->SetWindowName("ClipUnstructuredGridWithPlane");
  116.   renderWindow->Render();
  117.  
  118.   interactor->Start();
  119.  
  120.   // Generate a report
  121.   vtkIdType numberOfCells = clipper->GetOutput()->GetNumberOfCells();
  122.   std::cout << "------------------------" << std::endl;
  123.   std::cout << "The inside dataset contains a " << std::endl
  124.             << clipper->GetOutput()->GetClassName()
  125.             <<  " that has " << numberOfCells << " cells" << std::endl;
  126.   typedef std::map<int,int> CellContainer;
  127.   CellContainer cellMap;
  128.   for (vtkIdType i = 0; i < numberOfCells; i++)
  129.   {
  130.     cellMap[clipper->GetOutput()->GetCellType(i)]++;
  131.   }
  132.  
  133.   for (auto c : cellMap)
  134.   {
  135.     std::cout << "\tCell type "
  136.               << vtkCellTypes::GetClassNameFromTypeId(c.first)
  137.               << " occurs " << c.second << " times." << std::endl;
  138.   }
  139.  
  140.   numberOfCells = clipper->GetClippedOutput()->GetNumberOfCells();
  141.   std::cout << "------------------------" << std::endl;
  142.   std::cout << "The clipped dataset contains a " << std::endl
  143.             << clipper->GetClippedOutput()->GetClassName()
  144.             <<  " that has " << numberOfCells << " cells" << std::endl;
  145.   typedef std::map<int,int> OutsideCellContainer;
  146.   CellContainer outsideCellMap;
  147.   for (vtkIdType i = 0; i < numberOfCells; i++)
  148.   {
  149.     outsideCellMap[clipper->GetClippedOutput()->GetCellType(i)]++;
  150.   }
  151.  
  152.   for (auto c : outsideCellMap)
  153.   {
  154.     std::cout << "\tCell type "
  155.               << vtkCellTypes::GetClassNameFromTypeId(c.first)
  156.               << " occurs " << c.second << " times." << std::endl;
  157.   }
  158.   return EXIT_SUCCESS;
  159. }

实例2：ClipUnstructuredGridWithPlane2

该实例使用vtkClipDataSet对vtkUnstructuredGrid数据集进行Clip。vtkClipDataSet在未Clip的部位不会保留原有的Cells。与实例1比较，该实例在未Clip的区域将原有的vtkHexahedron转换成了vtkTetra。该实例的结果vtkUnstructuredGrid数据集的Cells数量比之前增加了四倍。

输入：treemesh.vtk

  1. #include <vtkSmartPointer.h>
  2. #include <vtkClipDataSet.h>
  3. #include <vtkUnstructuredGridReader.h>
  4. #include <vtkUnstructuredGrid.h>
  5. #include <vtkPlane.h>
  6. #include <vtkTransform.h>
  7.  
  8. #include <vtkActor.h>
  9. #include <vtkCamera.h>
  10. #include <vtkCellTypes.h>
  11. #include <vtkDataSetMapper.h>
  12. #include <vtkLookupTable.h>
  13. #include <vtkProperty.h>
  14. #include <vtkRenderWindow.h>
  15. #include <vtkRenderWindowInteractor.h>
  16. #include <vtkRenderer.h>
  17.  
  18. #include <vtkNamedColors.h>
  19.  
  20. int main(int argc, char *argv[])
  21. {
  22.   if (argc < 2)
  23.   {
  24.     std::cout << "Usage: " << argv[0] << " filename.vtk" << std::endl;
  25.     return EXIT_FAILURE;
  26.   }
  27.   // Create the reader for the data.
  28.   std::string filename = argv[1];
  29.   std::cout << "Loading " << filename.c_str() << std::endl;
  30.   auto reader =
  31.     vtkSmartPointer<vtkUnstructuredGridReader>::New();
  32.   reader->SetFileName(filename.c_str());
  33.   reader->Update();
  34.  
  35.   double bounds[6];
  36.   reader->GetOutput()->GetBounds(bounds);  
  37.   double center[3];
  38.   reader->GetOutput()->GetCenter(center);  
  39.  
  40.   auto colors =
  41.     vtkSmartPointer<vtkNamedColors>::New();
  42.   auto renderer = vtkSmartPointer<vtkRenderer>::New();
  43.   renderer->SetBackground(colors->GetColor3d("Wheat").GetData());
  44.   renderer->UseHiddenLineRemovalOn();
  45.  
  46.   auto renderWindow =
  47.     vtkSmartPointer<vtkRenderWindow>::New();
  48.   renderWindow->AddRenderer(renderer);
  49.   renderWindow->SetSize(640, 480);
  50.  
  51.   auto interactor =
  52.     vtkSmartPointer<vtkRenderWindowInteractor>::New();
  53.   interactor->SetRenderWindow(renderWindow);
  54.  
  55.   double xnorm[3] = {-1.0, -1.0, 1.0};
  56.  
  57.   auto clipPlane = vtkSmartPointer<vtkPlane>::New();
  58.   clipPlane->SetOrigin(reader->GetOutput()->GetCenter());
  59.   clipPlane->SetNormal(xnorm);
  60.  
  61.   auto clipper =
  62.     vtkSmartPointer<vtkClipDataSet>::New();
  63.   clipper->SetClipFunction(clipPlane);
  64.   clipper->SetInputData(reader->GetOutput());
  65.   clipper->SetValue(0.0);
  66.   clipper->GenerateClippedOutputOn();
  67.   clipper->Update();
  68.  
  69.   auto insideMapper =
  70.     vtkSmartPointer<vtkDataSetMapper>::New();
  71.   insideMapper->SetInputData(clipper->GetOutput());
  72.   insideMapper->ScalarVisibilityOff();
  73.  
  74.   auto insideActor =
  75.     vtkSmartPointer<vtkActor>::New();
  76.   insideActor->SetMapper(insideMapper);
  77.   insideActor->GetProperty()->SetDiffuseColor(colors->GetColor3d("banana").GetData());
  78.   insideActor->GetProperty()->SetAmbient(.3);
  79.   insideActor->GetProperty()->EdgeVisibilityOn();
  80.  
  81.   auto clippedMapper =
  82.     vtkSmartPointer<vtkDataSetMapper>::New();
  83.   clippedMapper->SetInputData(clipper->GetClippedOutput());
  84.   clippedMapper->ScalarVisibilityOff();
  85.  
  86.   auto clippedActor =
  87.     vtkSmartPointer<vtkActor>::New();
  88.   clippedActor->SetMapper(clippedMapper);
  89.   clippedActor->GetProperty()->SetDiffuseColor(colors->GetColor3d("tomato").GetData());
  90.   insideActor->GetProperty()->SetAmbient(.3);
  91.   clippedActor->GetProperty()->EdgeVisibilityOn();
  92.  
  93.   // Create transforms to make a better visualization
  94.   auto insideTransform = vtkSmartPointer<vtkTransform>::New();
  95.   insideTransform->Translate(-(bounds[1] - bounds[0]) * .75, 0, 0);
  96.   insideTransform->Translate(center[0], center[1], center[2]);
  97.   insideTransform->RotateY(-120.0);
  98.   insideTransform->Translate(-center[0], -center[1], -center[2]);
  99.   insideActor->SetUserTransform(insideTransform);
  100.  
  101.   auto clippedTransform = vtkSmartPointer<vtkTransform>::New();
  102.   clippedTransform->Translate((bounds[1] - bounds[0]) * .75, 0, 0);
  103.   clippedTransform->Translate(center[0], center[1], center[2]);
  104.   clippedTransform->RotateY(60.0);
  105.   clippedTransform->Translate(-center[0], -center[1], -center[2]);
  106.   clippedActor->SetUserTransform(clippedTransform);
  107.  
  108.   renderer->AddViewProp(clippedActor);
  109.   renderer->AddViewProp(insideActor);
  110.  
  111.   renderer->ResetCamera();
  112.   renderer->GetActiveCamera()->Dolly(1.4);
  113.   renderer->ResetCameraClippingRange();
  114.   renderWindow->Render();
  115.   renderWindow->SetWindowName("ClipUnstructuredGridWithPlane2");
  116.   renderWindow->Render();
  117.  
  118.   interactor->Start();
  119.  
  120.   // Generate a report
  121.   vtkIdType numberOfCells = clipper->GetOutput()->GetNumberOfCells();
  122.   std::cout << "------------------------" << std::endl;
  123.   std::cout << "The inside dataset contains a " << std::endl
  124.             << clipper->GetOutput()->GetClassName()
  125.             <<  " that has " << numberOfCells << " cells" << std::endl;
  126.   typedef std::map<int,int> CellContainer;
  127.   CellContainer cellMap;
  128.   for (vtkIdType i = 0; i < numberOfCells; i++)
  129.   {
  130.     cellMap[clipper->GetOutput()->GetCellType(i)]++;
  131.   }
  132.  
  133.   for (auto c : cellMap)
  134.   {
  135.     std::cout << "\tCell type "
  136.               << vtkCellTypes::GetClassNameFromTypeId(c.first)
  137.               << " occurs " << c.second << " times." << std::endl;
  138.   }
  139.  
  140.   numberOfCells = clipper->GetClippedOutput()->GetNumberOfCells();
  141.   std::cout << "------------------------" << std::endl;
  142.   std::cout << "The clipped dataset contains a " << std::endl
  143.             << clipper->GetClippedOutput()->GetClassName()
  144.             <<  " that has " << numberOfCells << " cells" << std::endl;
  145.   typedef std::map<int,int> OutsideCellContainer;
  146.   CellContainer outsideCellMap;
  147.   for (vtkIdType i = 0; i < numberOfCells; i++)
  148.   {
  149.     outsideCellMap[clipper->GetClippedOutput()->GetCellType(i)]++;
  150.   }
  151.  
  152.   for (auto c : outsideCellMap)
  153.   {
  154.     std::cout << "\tCell type "
  155.               << vtkCellTypes::GetClassNameFromTypeId(c.first)
  156.               << " occurs " << c.second << " times." << std::endl;
  157.   }
  158.   return EXIT_SUCCESS;
  159. }

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