[vtkusers] Multiple rendering layers reacting to interaction

[Oliver Kania]

Hello,
my application has several layers :

vtkRenderer RenderImage2 = new vtkRenderer();
vtkRenderer RenderImage = new vtkRenderer();

 RenderImage.SetLayer(0);
 RenderImage2.SetLayer(1);

 RenderImage.SetInteractive(1);
 RenderImage2.SetInteractive(1);


  RenderImage.SetBackground(0.0, 0.0, 0.3);

  vtkRenderWindow renWin = new vtkRenderWindow();
  renWin.SetNumberOfLayers(2);
  renWin.AddRenderer(RenderImage2);
  renWin.AddRenderer(RenderImage);

vtkRenderWindowInteractor iren = new vtkRenderWindowInteractor();
iren.SetRenderWindow(renWin);
//set image mode interaction style
vtkInteractorStyleImage interactor = new vtkInteractorStyleImage();
ren.SetInteractorStyle(interactor);

What I find is that only one layer reacts to interaction.
Since I used SetInteractive(), I was expecting that both layers do react.
More generally, I want to have an arbitrary number of layers that do
react to the same interaction. Maybe it is somehow possible to link
the cameras of the renderers ?
(I tried Renderer1.setCamera(Renderer2.getCamera()) but that does
not work)

kind regards,
Oliver
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