[vtkusers] how to make one actor always stay behind of other actors?&In-Reply-To=<s8ea3ca2.092 at g

[Yanbing Hu]

found the answer. do something like the following, actors added to
bRenderer always stay behind of actors added to aRenderer.
 
vtkRenderer *aRenderer = vtkRenderer::New();
                  aRenderer->SetLayer(1);
vtkRenderer *bRenderer = vtkRenderer::New();
                   bRenderer->InteractiveOff();
                   bRenderer->SetLayer(0);
vtkRenderWindow *renWin = vtkRenderWindow::New();
                  renWin->AddRenderer(aRenderer);
                  renWin->AddRenderer(bRenderer);
                  renWin->SetNumberOfLayers(2);

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