[vtkusers] layered renderers

[Oliver Kania]

Hello Steve,
I am glad someone else has the same problems to solve ;)
However, I fear you are right : The books do not contain any
documentation on this. I even searched the archives without success.
There is only one rudimentary CPP example.
Anyway, I will try to do the same as you are doing and
work myself through it. So maybe we can help each other out ?

Kind regards,
Oliver

2008/4/8, Steve Chall <stevec at renci.org>:
>
>
> >Message: 18
> >Date: Tue, 8 Apr 2008 14:12:32 +0200
> >From: "Oliver Kania" <ptw.freiburg at googlemail.com>
> >Subject: [vtkusers] Multiple rendering layers reacting to interaction
> >To: vtkusers at vtk.org
> >Message-ID:
> >       <e22fb1100804080512q2b1ad655oee6f3581183bfb60 at mail.gmail.com>
> >Content-Type: text/plain; charset="iso-8859-1"
> >
> >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
>
> Thank you, Oliver, for bringing layered rendering to my attention.  This
> sounds like it could resolve some visibility issues I'm experiencing.
> However, I can't seem to find very much documentation on this
> feature.  I've
> bought and looked through the books, read the code in vtkRenderer.h, and
> checked online, and pretty much all I've found out is that layers are
> numbered and all but the bottom are transparent.  I can and, if necessary,
> will work through it empirically, i.e., by writing code and seeing what
> happens.  But it would be valuable and probably much more efficient if
> there
> were some more thorough documentation than what I've found thus far.  Can
> anyone point me to it?  Admittedly, once again I may have just overlooked
> something obvious, but if so I'd appreciate someone shaking me out of my
> tunnel vision.  Thanks all.
>
> -Steve
>
>
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