How to orient (rotate) the skybox background

[EwingKang]

I'm using a combination of open3d::visualization::gui::Application::GetInstance().Initialize(path) and gui::Application::GetInstance().AddWindow( std::make_shared<visualization::visualizer::O3DVisualizer>() ) for visualization.
By default, the O3DVisualizer seems to inherits the directory path assign to the application, and loads the skybox (IBL?) from it. My problem is, it's always using the XZ plane as ground plane for the background skybox. This is true even with SetGroundPlane() set.

The closest I can find is the RotateIBLInteractor that response when user use the scene select control panel to rotate the environment.
Is there any way I can set the background skybox manually through APIs?

[EwingKang]

Another way I found is through GuiVisualizer -> GuiSettingsView -> GuiSettingsModel -> GuiSettingsModel::LightingProfile, which contains a ibl_rotation transformation matrix. However, it seems like the only entity that is using this class is the APP-viewer.