如何旋转vtkVectorText使其朝向某个方向？

#include <vtkSmartPointer.h>
#include <vtkVectorText.h>
#include <vtkPolyDataMapper.h>
#include <vtkActor.h>
#include <vtkRenderer.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkTransform.h>

int main()
{
    // 创建vtkVectorText对象，并设置文本内容
    vtkSmartPointer<vtkVectorText> vectorText = vtkSmartPointer<vtkVectorText>::New();
    vectorText->SetText("Hello, World!");

    // 创建vtkPolyDataMapper对象，并将vtkVectorText对象作为输入
    vtkSmartPointer<vtkPolyDataMapper> mapper = vtkSmartPointer<vtkPolyDataMapper>::New();
    mapper->SetInputConnection(vectorText->GetOutputPort());

    // 创建vtkActor对象，并将vtkPolyDataMapper对象作为输入
    vtkSmartPointer<vtkActor> actor = vtkSmartPointer<vtkActor>::New();
    actor->SetMapper(mapper);

    // 创建vtkRenderer对象，并将vtkActor对象添加到其中
    vtkSmartPointer<vtkRenderer> renderer = vtkSmartPointer<vtkRenderer>::New();
    renderer->AddActor(actor);

    // 创建vtkRenderWindow对象，并将vtkRenderer对象添加到其中
    vtkSmartPointer<vtkRenderWindow> renderWindow = vtkSmartPointer<vtkRenderWindow>::New();
    renderWindow->AddRenderer(renderer);

    // 创建vtkRenderWindowInteractor对象，并将vtkRenderWindow对象设置为其渲染窗口
    vtkSmartPointer<vtkRenderWindowInteractor> interactor = vtkSmartPointer<vtkRenderWindowInteractor>::New();
    interactor->SetRenderWindow(renderWindow);

    // 创建vtkTransform对象，并设置旋转角度和旋转轴
    vtkSmartPointer<vtkTransform> transform = vtkSmartPointer<vtkTransform>::New();
    transform->RotateWXYZ(45, 0, 1, 0); // 以Y轴为旋转轴，旋转45度

    // 将vtkTransform对象应用于vtkActor对象
    actor->SetUserTransform(transform);

    // 启动vtkRenderWindowInteractor对象的事件循环
    interactor->Initialize();
    interactor->Start();

    return 0;
}