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Update opencv viz3d window after calling spin() (event loop)

I made a program based on the user inputs some widgets appear inside viz3d window. the problem is I want the widget's pose to get updated real time so the program should do the following: 1- take inputs from the user from GUI 2- pop up a window with the wanted widget. 3- the user can ask for more widgets to add 4-update the window with the new widgets i can't figure out a way to update viz3d window any widget I add after calling window. spin() or window.spinonce() doesn't appear