[vtkusers] Getting Data (ID, Position, Normals) from a Volume.

[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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