Qt + VTK RenderWindow ghosting

Support
,
1

We are having issues with ghosting when another widget is visible on top of the render window. Specifically, we have QVTKRenderWindowInteractor widgets in tabs. When you go to a different tab, then back to a tab with the QVTKRenderWindowInteractor, the previous tab’s widgets are still visible (but not interactable) on top of the QVTKRenderWindowInteractor. At the same time, we can show/hide a popup with another QVTKRenderWindowInteractor just fine.

The issue specifically happens with:
Qt: 5.15.6
VTK: 9.2.2
OS: Ubunutu
Source: conda-forge

Downgrading Qt to 5.15.4 works as expected. It also works fine on Windows/OSX, seems specific to Linux.

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2

Hello,

My two cents: do a re-render of the VTK scene upon activating the tab corresponding to the render window. Supposing your tab widget is a QTabWidget, just connect a slot to its currentChanged(int index) signal. I suppose the tab of the render window has zero index. In your slot, just call Render() of your vtkRenderWindow(s) if index == 0.

cheers,

Paulo