[vtkusers] two renderer in renderwindow

[Amy Henderson]

Hi Thomas,

The thing that jumps out at me from your code snippet is that the renderer 
layers are now in the wrong order. Awhile ago (certainly before the current 
version of VTK), the order of renderer layers was changed so that the 
bottom-most layer was numbered 0, and layers on top of it had increasing 
layer numbers.

This e-mail explains the reasons for the change: 
http://vtk.org/pipermail/vtkusers/2004-February/022036.html.

- Amy

At 10:43 AM 5/28/2004, Thomas Faust wrote:
>Hi VTK users.
>
>A while ago (with an older version of vtk) I wrote a application, that 
>handles
>two renderer in one renderwindow. A main renderer and a renderer that holds
>three arrows to see the rotation of the volume in the other renderer.
>
>This is what i did:
>
>-- snip --
>renderwindow->SetNumberofLayers( 2 );
>renderwindow->AddRenderer( axesRenderer );
>axesRenderer->SetLayer( 0 );
>axesRenderer->SetBackground( 1.0, 1.0, 1.0 );
>axesRenderer->SetViewport( 0.0, 0.8, 0.2, 1.0 );
>   // 20% in the upper left corner
>
>renderwindow->AddRenderer( mainRenderer );
>mainRenderer->SetLayer( 1 );
>mainRenerer->SetBackground( 1.0, 1.0, 1.0 );
>-- end snip --
>
>I worked fine until I updated the the current VTK version.
>
>Now I get a very ugly behavior when rotating the model. The background don't
>get white again and when interacting with the model, it leaves prints
>wherever it was drawn.
>
>Did somebody saw the same behavior?
>What is the right way to display two renderer correctly?
>
>
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