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开发环境：

1. Windows 11 家庭中文版
2. Microsoft Visual Studio Community 2019
3. VTK-9.3.0.rc0
4. vtk-example
5. 参考代码

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demo解决问题：不同阶段添加多个单元对象。 定义一个点集和一个单元集合，单元的类型可以是点、三角形、矩形、多边形等基本图形。只有定义了单元数据才能显示该图形数据。
关键类：vtkPoints、vtkCellArray、vtkPolyData

vtkPolyData可以看看知乎这位老兄的总结：https://zhuanlan.zhihu.com/p/336743251

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prj name: AddCell

#include <vtkCellArray.h>
#include <vtkNew.h>
#include <vtkPolyData.h>
#include <vtkTriangle.h>int main(int, char*[])
{// Create a trianglevtkNew<vtkPoints> points;points->InsertNextPoint(1.0, 0.0, 0.0);points->InsertNextPoint(0.0, 0.0, 0.0);points->InsertNextPoint(0.0, 1.0, 0.0);vtkNew<vtkTriangle> triangle;triangle->GetPointIds()->SetId(0, 0);triangle->GetPointIds()->SetId(1, 1);triangle->GetPointIds()->SetId(2, 2);//构造cell array 并插入一个单元对象的索引，插入操作是深拷贝vtkNew<vtkCellArray> triangles;triangles->InsertNextCell(triangle);// Create a polydata objectvtkNew<vtkPolyData> polyData;// Add the geometry and topology to the polydatapolyData->SetPoints(points);polyData->SetPolys(triangles);std::cout << "There are " << polyData->GetNumberOfCells() << " cells."<< std::endl;polyData->GetPolys()->InsertNextCell(triangle);//获取到cell array后再插入一个单元对象std::cout << "There are " << polyData->GetNumberOfCells() << " cells."<< std::endl;return EXIT_SUCCESS;
}