[vtkusers] Re: Question about mixing 2d and 3d actors again...

[Roger Blum]

Hi Anja,

I had the same problem a couple of week ago. This is what helped in my case:

I had to eplicitly use the SetTransformCoordinate of the mapper object. I am 
using Tcl, but you probably can try the same in C++:

    # Create a vtkCoordinate object and set the coordinate systrem to world 
coordinates
    set worldCoords [vtkCoordinate rapWorldCoord]
    $worldCoords SetCoordinateSystemToWorld
    ...
    # Create a 2D mapper and set its transform coordinate
    set mapper2DSymbol [vtkPolyDataMapper2D rapPDM2]
    $mapper2DSymbol SetTransformCoordinate $worldCoords

HTH,
Roger



"Anja Ende" <anja.ende at googlemail.com> schrieb im Newsbeitrag 
news:1f5d2b4f0610110333r317ea8e7g3ec93905646fde41 at mail.gmail.com...
Hi everyone,

I was wondering if anyone has successfully displayed a 3d actor over a 2d 
actor and be willing to share an example.

I tried but unsuccessfully... I am only either able to show the 3d actor 
that is scaled and my 2d actor is not visible or I see nothing at all. I 
tried setting camera stuff (especially with  parallel projection) but did 
not really work. I guess I am shooting in the dark here...

I am trying to do something simple like:

// Add our 2d actor
this->m_renderer->AddActor(this->m_actor2D);

vtkPNGReader * cursorImage = vtkPNGReader::New();
cursorImage->SetFileName("/home/anja/bin/crosshair.png");
cursorImage->Update();

vtkImageActor * actor = vtkImageActor::New();
actor->SetInput(cursorImage->GetOutput());
actor->PickableOn();
// Add the 3d actor.
this->m_renderer->AddActor(actor);
actor->Delete();
cursorImage->Delete();

// As per David's suggestion.
this->m_actor2D->GetProperty()->SetDisplayLocationToBackground();

this->m_renderer->GetActiveCamera()->ParallelProjectionOn();

Hope you can help me. Thanks again :)

I will keep trying and update this thread when this is solved. I think a lot 
of newbies like me are struggling with this.

Cheers,

Anja



_______________________________________________
This is the private VTK discussion list.
Please keep messages on-topic. Check the FAQ at: 
http://www.vtk.org/Wiki/VTK_FAQ
Follow this link to subscribe/unsubscribe:
http://www.vtk.org/mailman/listinfo/vtkusers