[vtkusers] same camera on different viewpoints

[Luca Pallozzi Lavorante]

Hi Mark,
I have used the "ren2->SetActiveCamera(ren1->GetActiveCamera())" approach
only on small test programs and I have got no crashes. On production
applications the pair vtkOrientationMarkerWidget / vtkAxesActor was
sufficient to me as I only needed a smaller viewport showing axes "perfectly
alligned" with the object shown in the main viewport.

It would be interesting to know if anybody on the list has had crash
problems by sharing camera pointers among renderers.

    Luca


On Jan 9, 2008 4:09 PM, Mark Wyszomierski <markww at gmail.com> wrote:

> Luca, I had tried that myself at one point:
>
>     ren2->SetActiveCamera(ren1->GetActiveCamera());
>
> but would get random crashes, has it been ok for you? I eventually had
> to manually copy over camera parameters between the two cameras
> instead to get the same effect.
>
> I think what Sicilia wants is to have the same interaction propagated
> to all renderers (since the cameras may be setup in different
> locations). This probably isn't a typical thing to do, normally you
> want the camera location copied throughout all renderers instead. I
> was looking into this but couldn't figure out myself how to Invoke()
> the same interaction on another renderer. We can listen on Interaction
> events on the render window's interactor, but not quite sure how to
> propagate it to the other renderers.
>
> Mark
>
>
> On Jan 9, 2008 8:52 AM, Sicilia Judice <siciliajudice at gmail.com> wrote:
> > I think I am very near to finish this...
> >
> > Let me try to explain... I have to generate stereo images to use with
> > Crystal Eyes... So, I have create two viewports, displayed vertically,
> one
> > over other... The upper viewport is the stereo image for one eye, and
> the
> > second one for the other eye. I have to put one of this images with a
> > difference of 5° (the paralaxe). I was creating two cameras, each one
> for
> > one viewport. In the second camera I was using the method Azimuth(5).
> But in
> > this way, I was having to take care of the interaction, what I could not
> > done... Now I have try a different solution: I create only one camera
> and
> > set to both viewports. Now, any action with the mouse move the two
> images
> > together... But I have to translate the second image in 5°, and I do not
> > know how to do it... How can I translate an imagem in a viewport???
> >
> > ps.: sorry for the english, I am from Brazil!
> >
> > ps2.: thanks for the attention!!!
> >
> >
> >
> > On Jan 9, 2008 11:42 AM, Luca Pallozzi Lavorante <lplavorante at gmail.com>
> > wrote:
> > >
> > >
> > >
> > > Sicilia,
> > > if you work in C++, let's say you have two viewports, with two
> > corresponding instances of vtkRenderer, ren1 and ren2. Say that you want
> to
> > modify ren2´s camera according to whatever interaction you perform on
> ren1
> > (via a vtkRenderWindowInteractor). The command to accomplish that is :
> > >
> > > ren2->SetActiveCamera(ren1->GetActiveCamera());
> > >
> > > Hope this help
> > >
> > >       Luca
> > >
> > > _______________________________________________
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> > >
> >
> >
> >
> > --
> >
> ---------------------------------------------------------------------------
> > Sicilia Ferreira Judice
> > www.lncc.br/~sicilia <http://www.lncc.br/%7Esicilia>
> > sicilia at lncc.br
> >
> > Laboratório Nacional de Computação Cientifica
> > Avenida Getulio Vargas, 333 - Quitandinha.
> > Petrópolis, RJ, Brasil - CEP: 25651-075.
> > Sala 1A-44  | Tel. +55 (24) 2233-6173
> > Lab. Virtual | Tel. +55 (24) 2233-6098
> > _______________________________________________
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> >
> >
>
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