I managed to get things working with multiple windows sharing an interactor, but I really don’t like this approach. I have also noticed some weird VTK code that gets injected into the WASM. Manager currently on holidays, so we will get things up and running. For sure, I would recommend that for our final product we get support from you. It is not so nice maintaining an in-house integration of VTK for a window manager. I lived with my own Qt/QML integration two year before it was included in VTK.