用QT给我写一个可以显示点云的代码并给配上注释

好的，以下是可以显示点云的 QT 代码，已经配上了注释：

#include <QApplication>
#include <QMainWindow>
#include <QVTKOpenGLWidget.h>
#include <vtkSmartPointer.h>
#include <vtkPLYReader.h>
#include <vtkPolyDataMapper.h>
#include <vtkActor.h>
#include <vtkRenderer.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

    // 创建主窗口
    QMainWindow mainWindow;

    // 创建 VTK 渲染窗口
    QVTKOpenGLWidget *vtkWidget = new QVTKOpenGLWidget(&mainWindow);
    vtkWidget->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
    mainWindow.setCentralWidget(vtkWidget);

    // 读取点云数据
    vtkSmartPointer<vtkPLYReader> reader = vtkSmartPointer<vtkPLYReader>::New();
    reader->SetFileName("point_cloud.ply");
    reader->Update();

    // 创建点云映射器
    vtkSmartPointer<vtkPolyDataMapper> mapper = vtkSmartPointer<vtkPolyDataMapper>::New();
    mapper->SetInputConnection(reader->GetOutputPort());

    // 创建点云演员
    vtkSmartPointer<vtkActor> actor = vtkSmartPointer<vtkActor>::New();
    actor->SetMapper(mapper);

    // 创建渲染器
    vtkSmartPointer<vtkRenderer> renderer = vtkSmartPointer<vtkRenderer>::New();
    renderer->AddActor(actor);
    renderer->SetBackground(.1, .2, .4);

    // 创建渲染窗口
    vtkSmartPointer<vtkRenderWindow> renderWindow = vtkSmartPointer<vtkRenderWindow>::New();
    renderWindow->AddRenderer(renderer);
    renderWindow->SetSize(800, 600);

    // 创建交互器
    vtkSmartPointer<vtkRenderWindowInteractor> interactor = vtkSmartPointer<vtkRenderWindowInteractor>::New();
    interactor->SetRenderWindow(renderWindow);

    // 显示窗口
    mainWindow.show();

    // 开始渲染
    renderWindow->Render();
    interactor->Start();

    return a.exec();
}

希望这个代码对你有所帮助！