Nothing visible in the displayer when trying to addGeometry from widget, but works when I do addGeometry from window.

[MeyerBuaharon]

I try to make in cpp a running displayer that runs on a thread and always redraw plys. I did it in python and it worked perfectly, but I need to recreate the code in cpp, but im having a bit of difficulty with the widget.

`int main(int argc, char *argv[]) {
int width = 1024;
int height = 768;
std::string window_name = "Open3D";
Eigen::Vector3f center = {0.0, 0.0, 0.0};
Eigen::Vector3f eye = {125.0, 125.0, 125.0};
Eigen::Vector3f up = {0.0, 0.0, 1.0};

gui::Application::GetInstance().Initialize();

auto window =
        std::make_shared<open3d::visualization::visualizer::O3DVisualizer>(
                window_name, width, height);
                auto *scene = new rendering::Open3DScene();
auto widget = std::make_shared<gui::SceneWidget>();
 
widget->SetScene(
        std::make_shared<rendering::Open3DScene>(window->GetRenderer()));
widget->EnableSceneCaching(true);  // smoother UI with large geometry
window->AddChild(widget);
cout << window->GetScene() << endl;

gui::Application::GetInstance().AddWindow(window);

auto mat = rendering::MaterialRecord();

mat.shader = "defaultLit";

window->GetScene()->GetCamera()->LookAt(center, eye, up);

std::shared_ptr<geometry::PointCloud> pointcloud_ptr_A(
        new geometry::PointCloud);

geometry::PointCloud pointcloudA;

io::ReadPointCloud("../SplitCube/" + std::to_string(1) + "A.ply",
                   pointcloudA);

*pointcloud_ptr_A = pointcloudA;

widget->GetScene()->AddGeometry("pcdA", pointcloud_ptr_A.get(), mat);
    thread t([window, widget]() { run(window, widget); });
    t.detach();
gui::Application::GetInstance().Run();

return 0;

}`

this is my main, and as you can see when I try to do AddGeometry to pointcloud_ptr_A I get a blank displayer, but when I try and do window->GetScene()->AddGeometry(...) this show the ply.

Can anyone here point out what I did wrong?
Thanks for this tool, it is really interesting!