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开发环境：

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

demo解决问题：点附近创建左边或其他信息，且信息面板显示状态不受相机缩放、旋转影响

使用vtkVectorText、vtkFollower自定义一个标注对象，效果与官方demo（vtkBillboardTextActor3D）基本一致，线性拉伸后可以避免一部分文字遮挡问题，贴出主要代码：

cpp

    // zoom
    renderer()->GetActiveCamera()->ParallelProjectionOn();
    double zoom = renderer->GetActiveCamera()->GetParallelScale() / 18;

	// text
	vtkNew<vtkVectorText> atext;
    atext->SetText("text");

    vtkSmartPointer<vtkLinearExtrusionFilter> linearExtrusionFilter =  vtkSmartPointer<vtkLinearExtrusionFilter>::New();
    linearExtrusionFilter->SetInputConnection(atext->GetOutputPort());
    linearExtrusionFilter->SetExtrusionType(VTK_NORMAL_EXTRUSION);
    linearExtrusionFilter->SetVector(0, 0, 1.0);
    linearExtrusionFilter->SetScaleFactor(2);

    vtkNew<vtkPolyDataMapper> textMapper;
    textMapper->SetInputConnection(linearExtrusionFilter->GetOutputPort());

    vtkNew<vtkFollower> textActor;
    textActor->SetMapper(textMapper);
    textActor->SetScale(zoom);
    textActor->AddPosition(postion);
    textActor->GetProperty()->SetColor(namedColors->GetColor3d("Red").GetData());
    textActor->SetCamera(renderer()->GetActiveCamera());

    // sphere
	vtkSmartPointer<vtkSphereSource> sphereSource = vtkSmartPointer<vtkSphereSource>::New();
	sphereSource->Update();

	vtkSmartPointer<vtkPolyDataMapper> sphereMapper = vtkSmartPointer<vtkPolyDataMap

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