[vtkusers] (no subject)

[Timo Frenzel]

Hi,

i'm trying to handle some pointdata of an image-based volume (like medical
in the vtk-examples) after picking it.
To get the data i created a callback function like pointpicker:

static	vtkActor		*m_coneActor1;

class vtkMyCallback : public vtkCommand
{
public:
	vtkMyCallback::vtkMyCallback() { };
	static vtkMyCallback *New() { return new vtkMyCallback; }

public:	
       virtual void Execute(vtkObject *caller, unsigned long, void*)
	{
		vtkRenderWindowInteractor *m_iren =
reinterpret_cast<vtkRenderWindowInteractor*>(caller);
		vtkPointPicker *m_ppicker = (vtkPointPicker *)m_iren->GetPicker();
		if (m_ppicker->GetPointId() != -1)
		{
			int m_pointID = m_ppicker -> GetPointId();
			float m_pointValue[3];

			m_ppicker -> GetPickPosition(m_pointValue);
                        m_coneActor1 ->
SetPosition(m_ppicker->GetPickPosition());


			otherclassfunction -> Pick3DPointID(&m_pointID);
			otherclassfunction -> Pick3DPointValue(&m_pointValue[0],
&m_pointValue[1], &m_pointValue[2]);
		}
      }
};

With this code, i get a pointID (pointpicker) and the position. After i left
the callback function the association of the pointID with the coordinates
seems not to be the same.
Cause if i try to re-get the coordinates with this code...

vtkPoints *m_points;
m_points = vtkPoints::New();
m_points -> GetPoint(pointID, p0); //pointID from callback function

...i get a access violation. (debugging shows that the ID is not allocated.)


is it, cause there are no points defined? are cells defined and how can i
access the pointID and the coordinates like pointpicker do?

thx for help. timo frenzel.

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