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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

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demo解决问题：在渲染场景中进行交互式定位，并与特定对象或位置相关联，增强了3D数据的可视化。它提供了设置标题文本、自定义外观以及在3D空间中锚定其位置的功能。

关键点：

1. vtkCaptionWidget可以在渲染场景中进行交互式定位，并与特定对象或位置相关联，增强了3D数据的可视化。它提供了设置标题文本、自定义外观以及在3D空间中锚定其位置的功能。这个小部件常用于工程可视化应用程序中，用于标记和注释3D可视化，使底层数据更清晰地呈现和演示。

  // Create the widget and its representation.vtkNew<vtkCaptionRepresentation> captionRepresentation;captionRepresentation->GetCaptionActor2D()->SetCaption("Test caption");captionRepresentation->GetCaptionActor2D()->GetTextActor()->GetTextProperty()->SetFontSize(100);double pos[3] = {.5, 0, 0};captionRepresentation->SetAnchorPosition(pos);vtkNew<vtkCaptionWidget> captionWidget;captionWidget->SetInteractor(renderWindowInteractor);captionWidget->SetRepresentation(captionRepresentation);

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prj name: CaptionActor2D

#include <vtkActor.h>
// #include <vtkCallbackCommand.h>
#include <vtkCamera.h>
#include <vtkCaptionActor2D.h>
#include <vtkCaptionRepresentation.h>
#include <vtkCaptionWidget.h>
#include <vtkNamedColors.h>
#include <vtkNew.h>
// #include <vtkPolyData.h>
#include <vtkPolyDataMapper.h>
#include <vtkProperty.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>
#include <vtkSphereSource.h>
#include <vtkTextActor.h>
#include <vtkTextProperty.h>int main(int, char*[])
{vtkNew<vtkNamedColors> colors;// SpherevtkNew<vtkSphereSource> sphereSource;sphereSource->Update();vtkNew<vtkPolyDataMapper> mapper;mapper->SetInputConnection(sphereSource->GetOutputPort());vtkNew<vtkActor> actor;actor->SetMapper(mapper);actor->GetProperty()->SetColor(colors->GetColor3d("DarkOliveGreen").GetData());// A renderer and render window.vtkNew<vtkRenderer> renderer;vtkNew<vtkRenderWindow> renderWindow;renderWindow->AddRenderer(renderer);renderWindow->SetWindowName("CaptionWidget");// An interactorvtkNew<vtkRenderWindowInteractor> renderWindowInteractor;renderWindowInteractor->SetRenderWindow(renderWindow);// Create the widget and its representation.vtkNew<vtkCaptionRepresentation> captionRepresentation;captionRepresentation->GetCaptionActor2D()->SetCaption("Test caption");captionRepresentation->GetCaptionActor2D()->GetTextActor()->GetTextProperty()->SetFontSize(100);double pos[3] = {.5, 0, 0};captionRepresentation->SetAnchorPosition(pos);vtkNew<vtkCaptionWidget> captionWidget;captionWidget->SetInteractor(renderWindowInteractor);captionWidget->SetRepresentation(captionRepresentation);// Add the actors to the scene.renderer->AddActor(actor);renderer->SetBackground(colors->GetColor3d("Blue").GetData());renderWindow->Render();// Rotate the camera to bring the point the caption is pointing to into view.renderer->GetActiveCamera()->Azimuth(90);captionWidget->On();// Begin mouse interactionrenderWindowInteractor->Start();return EXIT_SUCCESS;
}