單元綁定舊方法

     //單元類型列表
    vtkIdTypeArray* cellInfoList = vtkIdTypeArray::New();
    cellInfoList->SetNumberOfValues((numCellPnts + 1) * numberCells);
    vtkIdType* cellInforPtr = cellInfoList->GetPointer(0);
//單元列表
    vtkUnsignedCharArray* cellTypeList = vtkUnsignedCharArray::New();
    cellTypeList->SetNumberOfValues(numberCells);
    unsigned char* cellTypesPtr = cellTypeList->GetPointer(0);

    for (int c = 0; c < numberCells; c++)
    {
               //單元類型
        *cellTypesPtr++ = VTK_CellType;
                //單元點(diǎn)數(shù)
        *cellInforPtr++ = numCellPnts;

        for (int j = 0; j < numCellPnts; j++)
        {
                         //點(diǎn)
            //*cellInforPtr++ = pointID
        }
    }
    cellInforPtr = nullptr;
    cellTypesPtr = nullptr;

    // 單元數(shù)組
    vtkCellArray* theCellArray = vtkCellArray::New();
    theCellArray->ImportLegacyFormat(cellInfoList);
    cellInfoList->Delete();
    cellInfoList = nullptr;

    // 綁定單元
    unstrctGrid->SetCells(cellTypeList, theCellArray);
    theCellArray->Delete();
    cellTypeList->Delete();
    theCellArray = nullptr;
    cellTypeList = nullptr;

vtk單元類型：https://blog.csdn.net/calmreason/article/details/124268501
新的填充方式相對于，創(chuàng)建單元對象的方式效率更高，比綁定單元的方式更靈活。
vtk新的填充單元方式（非多面體）

vtkNew<vtkUnstructuredGrid> unstruct;
std::vector<std::vector>cells;//單元和點(diǎn)id
unstruct->Allocate(cells.size());//初始化單元大小
for (int i = 0 ;i< cells.size();i++)
{
   vtkNew<vtkIdList> cellIDdList;//填充單元點(diǎn)id數(shù)據(jù)
   for (int curri = 0; curri < cells[i].size(); curri++)
  {
     cellIDdList->InsertNextId(cells[i][curri]);
  }
  unstruct->InsertNextCell(VTK_POLYGON, cellIDdList->GetNumberOfIds(), cellIDdList->GetPointer(0));//填充單元，1.單元類型，2.單元點(diǎn)數(shù)，3數(shù)據(jù)指針
}

vtk新的填充單元方式（多面體）
多面體單元數(shù)據(jù)需要面和點(diǎn)，點(diǎn)構(gòu)成面，面構(gòu)成體。

    vtkNew<vtkUnstructuredGrid> unstruct;
    std::vector<std::vector<vtkIdType>> cells;//每個單元的面id數(shù)據(jù)
    std::vector<std::vector<vtkIdType>> faces;//每個面的點(diǎn)id數(shù)據(jù)
    unstruct->Allocate(cells.size());//初始化單元大小
    for (int i = 0; i < cells.size();i++)
    {
        const auto& cell = cells[i];
        vtkNew<vtkIdList> polyhedron;
        for (auto& aFaceIndex : cell )
        {
            const auto& aFace = faces[aFaceIndex];
            const auto faceSize = static_cast<vtkIdType>(aFace.size());//每個面點(diǎn)數(shù)
            polyhedron->InsertNextId(faceSize);
            for (auto& aVertexIndex : aFace)
            {
                polyhedron->InsertNextId(aVertexIndex);//填充點(diǎn)id數(shù)據(jù)
            }
        }
        unstruct->InsertNextCell(VTK_POLYHEDRON, cell .size(), polyhedron->GetPointer(0));//填充單元數(shù)據(jù)，2.面的數(shù)量，單元數(shù)據(jù)指針。
    }