A small update: When I render some objects and I press the button p
(which should also trigger picking (?) ) I get also a segmentation fault.
Milad Sadinam wrote:
> Hi all,
>
> thanks for all your responses. As I have some time-pressure for my
> project I will follow your suggestions and implement the
> DataTreeNode-picking by myself.
>
> Unfortunately, I encountered some more problems. Let me explain shortly
> what I am doing. I am listening to the event "LeftButtonPressEvent" of
> the vtkRenderWindowInteractor of mitkWidget4. This works well.
> So, when the execute-method of my vtkCommand-class is called I know that
> someone clicked with the mouse on the mitkWidget4. In the execute-method
> I use then the following code:
>
> void QmitkBmcvPickingCommand::Execute (vtkObject *caller, unsigned long
> eventId, void *callData)
> {
> // The caller is a vtkRenderWindowInteractor-object
> vtkRenderWindowInteractor* interactor =
> dynamic_cast<vtkRenderWindowInteractor*>(caller);
>
> // Get the mouse-position where the user has clicked
> int x,y;
> interactor->GetMousePosition(&x, &y);
>
> // Let the picker pick
> interactor->GetPicker()->Pick(x, y, 0,
> mitk::BaseRenderer::GetByName("mitkWidget4")->GetVtkRenderer()) ;
> }
>
> Unfortunately, when calling the pick-method I get a segmentation fault.
> This is the call stack:
>
> std::vector::end (stl_vector.h:405)
> mitk::VtkPropRenderer::GetNextPath (mitkVtkPropRenderer.cpp:663)
> vtkMitkRenderProp::GetNextPath (vtkMitkRenderProp.cpp:70)
> vtkPicker::Pick (vtkPicker.cxx:280)
> ...
>
> The picker is initialized by calling interactor->CreateDefaultPicker().
> I also tried to initialize it by hand using a vtkPicker-object but did
> not help.
> Any idea what could be the problem?
>
> Something must be wrong. interactor->GetMousePosition(&x, &y) also gives
> me the values (0,0) although I am clicking somewhere in the middle of
> the widget.
>
> Hoping that you can help me again :)
>
> Milad
>
> Seitel Mathias wrote:
>
>> Dear Milad,
>>
>> We are currently discussing how picking of MITK objects could best be
>> realized. Currently, only point picking is supported, i.e. when you
>> click on an object (e.g. surface) in the 3D window, the corresponding
>> point (in 3D world coordinates) can be retrieved. This is for example
>> used by the mitk::PointSetInteractor (see also
>> DisplayPositionEvent::GetWorldPosition()).
>>
>> You are right that a vtkPicker can be used to retrieve the
>> vtkProp/vtkActor representation of the underlying dataset. From this,
>> the corresponding mitk::DataTreeNode could be retrieved by checking
>> whether the associated 3D Mapper contains this vtkProp/vtkActor.
>>
>> We are currently in the process of improving/extending the rendering
>> mechanism of MITK, which will make it simpler to retrieve this
>> information. Once this is done, object picking will be simple to
>> realize. We plan to have this ready by beginning of September. If this
>> doesn't fit your time schedule, you could for now experiment with
>> vtkPickers for yourself, with the suggestions I mentioned above.
>>
>> Best regards,
>> Mathias
>>
>>
>>
>>
>>> -----Original Message-----
>>> From: Milad Sadinam [mailto:[email protected]]
>>> Sent: Wednesday, August 12, 2009 3:34 PM
>>> To: [email protected]
>>> Subject: [mitk-users] picking with mitk
>>>
>>> Dear all,
>>>
>>> I am trying to do picking with mitk. I have read about picking in vtk
>>> and I think I got it.
>>> In the vtkAbstractPropPicker-class I have these GetActor- and
>>> GetProp-methods. But how do I get the mitk-object?
>>> What I am interested in is to get the mitk::BaseData-object or even
>>> better the DataTreeNode-object which contains the picked data.
>>>
>>> Would be glad to get a hint.
>>>
>>> Milad
>>>
>>>
>>>
>>>
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>>
>>
>
>
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