view_update might be throttling? about trame-vtk HOT 3 OPEN

I was not providing a fix here. I was just explaining what was happening so we/I could figure out a solution down the road when I get back to it. ;-)

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So it is a timing issue. Both views end up in animation, which makes the view.update() a NoOp. But then the animation get canceled before the encoding queue get fully flushed/consumed.

Can you make the callback happen when you actually drag the widget?

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Hm. Using interaction_event='always' (vtk.vtkCommand.InteractionEvent) in PyVista's add_plane_widget() fixes it for this case. However we don't always want to use this as slicing large data sets in this fashion would have serious performance implications.

ref https://docs.pyvista.org/version/stable/api/plotting/_autosummary/pyvista.Plotter.add_plane_widget.html

I'm wondering if there is another VTK event trigger we could use?

Or is there a way to force update the view?

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