VTKのオブジェクトをスレッドで生成・追加

#include <iostream>
#include <thread>

//VTK_MODULE_INITに必要
#include <vtkAutoInit.h>


#include <vtkSmartPointer.h>
#include <vtkRenderer.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>

#include <vtkPolyDataMapper.h>
#include <vtkSphereSource.h>
#include <vtkCallbackCommand.h>
#include <vtkCamera.h>

#include <vtkActor.h>

// #include "createpoly.hpp"

//必須
VTK_MODULE_INIT(vtkRenderingOpenGL2);
VTK_MODULE_INIT(vtkInteractionStyle);

// 定期的に Render する
void OnTimer(vtkObject* /*caller*/, unsigned long /*eventId*/, void* clientData, void* /*callData*/) {
    auto renderWindow = static_cast<vtkRenderWindow*>(clientData);
    if (renderWindow) {
        renderWindow->Render();
    }
}

// 停止フラグ
std::atomic<bool> g_stop{ false };
 

// スレッド
void work(vtkSmartPointer<vtkRenderer> renderer) {


    for (size_t i = 0; i < 100; i++) {

        // 乱数
        double x = (std::rand() % 100) / 10.0 - 5.0;
        double y = (std::rand() % 100) / 10.0 - 5.0;
        double z = (std::rand() % 100) / 10.0 - 5.0;
        // 球体


        vtkSmartPointer<vtkSphereSource> sphereSource = vtkSmartPointer<vtkSphereSource>::New();
        sphereSource->SetCenter(x,y,z);
        sphereSource->SetRadius(5.0);
        sphereSource->Update();

        vtkSmartPointer<vtkActor> actor = vtkSmartPointer<vtkActor>::New();
        vtkSmartPointer<vtkPolyDataMapper> mapper = vtkSmartPointer<vtkPolyDataMapper>::New();
        mapper->SetInputConnection(sphereSource->GetOutputPort());
        actor->SetMapper(mapper);
        renderer->AddActor(actor);


        std::this_thread::sleep_for(std::chrono::seconds(1));

        if(g_stop) 
            break;
    }

}

int main(int /*argc*/, char** /*argv*/)
{

    auto renderer = vtkSmartPointer<vtkRenderer>::New();
  

    renderer->ResetCamera();
    renderer->GetActiveCamera()->SetPosition(0, 0, 100);

    //////////////////////////////////////
    auto interactor = vtkSmartPointer<vtkRenderWindowInteractor>::New();

    //////////////////////////////////////
    auto renderWindow = vtkSmartPointer<vtkRenderWindow>::New();
    renderWindow->AddRenderer(renderer);
    renderWindow->SetInteractor(interactor);
    renderWindow->Render();

    auto cb = vtkSmartPointer<vtkCallbackCommand>::New();
    cb->SetClientData(renderWindow);
    cb->SetCallback(OnTimer);
    interactor->AddObserver(vtkCommand::TimerEvent, cb);

    interactor->Initialize();
    interactor->CreateRepeatingTimer(10);


    std::thread t1(work, renderer);

    interactor->Start(); //イベントループへ入る

    g_stop = true;
    t1.join();

    return 0;
}