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

[Roger Blum]

Hi Anja,

In my application I have geographic maps as background using the 
vtkImageActor (3D). On top of these I display 2D and 3D polydata objects 
created by vtkGlyph3D. The 2D symbols are mapped by a vtkPolyDataMapper2D. I 
have managed to have the overlayed polydata objects fixed in size by 
adjusting their size when changing camera position and/or view angle. To 
achieve this I added an observer on AnyEvent to the camera.

I'm not sure if this situation is similar to what you are doing, but maybe 
it gives you an idea to solve your problem.

Something else that was very helpful for my work is the VtkGUI tool 
(http://vtkgui.cineca.it/), although it's not available for the latest vtk 
release. It allows to experiment interactively with pipeline objects. This 
is the way I found a lot of answers to my questions (and ideas that don't 
work!), when nobody on this list could help. If you are on Linux, you can 
try Vtk Designer (http://www.vcreatelogic.com/oss/vtkdesigner/index.html) 
which works with Vtk 4.4.

Regards,
Roger

"Anja Ende" <anja.ende at googlemail.com> schrieb im Newsbeitrag 
news:1f5d2b4f0610110553v2c45bba1gbe0079a349d288f7 at mail.gmail.com...
hmmmmmmmmm... also this SetTransformCoordinate seems only available with 
vtkPolyDataMapper2D. Is there anything similar for the vtkImageMapper?

Confusing....! :D

Cheers,
Anja


On 11/10/06, Anja Ende <anja.ende at googlemail.com> wrote:
Hi Roger,

Thanks for replying to my question.

I just wanted to clarify it with you. So you had 2d and 3d actors on the 
same scene and you set the coordinate system of the 2D mapper to the world 
coordinate system. Did I understand you correctly?

Cheers,

Anja



On 11/10/06, Anja Ende < anja.ende at googlemail.com> wrote:
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




-- 
Cheers,

Anja



-- 
Cheers,

Anja



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