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