如何在vtkStructuredGrid上设置数据值

#include <vtkStructuredGrid.h>
#include <vtkPoints.h>
#include <vtkDoubleArray.h>
#include <vtkSmartPointer.h>

int main(int, char *[])
{
  // 创建一个空的vtkStructuredGrid对象
  vtkSmartPointer<vtkStructuredGrid> structuredGrid =
    vtkSmartPointer<vtkStructuredGrid>::New();

  // 设置结构化网格的点
  vtkSmartPointer<vtkPoints> points =
    vtkSmartPointer<vtkPoints>::New();

  // 添加点
  for (unsigned int k = 0; k < 2; k++)
  {
    for (unsigned int j = 0; j < 2; j++)
    {
      for (unsigned int i = 0; i < 2; i++)
      {
        points->InsertNextPoint(i, j, k);
      }
    }
  }
  structuredGrid->SetPoints(points);

  // 设置单元格数据
  vtkSmartPointer<vtkDoubleArray> cellData =
    vtkSmartPointer<vtkDoubleArray>::New();
  cellData->SetNumberOfComponents(1);
  cellData->SetName("CellData");

  // 添加数据值
  for (unsigned int k = 0; k < 2; k++)
  {
    for (unsigned int j = 0; j < 2; j++)
    {
      for (unsigned int i = 0; i < 2; i++)
      {
        cellData->InsertNextValue(i + j + k);
      }
    }
  }
  structuredGrid->GetCellData()->SetScalars(cellData);

  return EXIT_SUCCESS;
}