[vtkusers] vtkstreamtracer on a surface

[ZACK]

Hi Guys,

I have a problem displaying streamlines on outside surfaces of a volume. My
streamlines are visible only on the inside volume. Any help will be much
appreciated. below is an image to help explain the problem.

Here are my unstructured girds stream tracer code:

        vtkUnstructuredGrid * pGlobalUGrid =
(vtkUnstructuredGrid*)m_pUnstructuredGridModel->GetOutput();
        vtkSmartPointer<vtkPolyData> pPolydata =
vtkSmartPointer<vtkPolyData>::New();

        if (pGlobalUGrid != NULL)
                pPolydata->SetPoints(pGlobalUGrid->GetPoints());

        // Source of the streamlines
        vtkSmartPointer<vtkPointSource> seeds =
                vtkSmartPointer<vtkPointSource>::New();

        seeds->SetRadius(0.2);
        seeds->SetInput(pPolydata);
        seeds->SetCenter(pPolydata->GetCenter());
        seeds->SetNumberOfPoints(m_iNbrOsTreamPoints);


        vtkSmartPointer<vtkRungeKutta4> sph_rk4 =
vtkSmartPointer<vtkRungeKutta4>::New();

        vtkSmartPointer<vtkStreamTracer> streamer =
vtkSmartPointer<vtkStreamTracer>::New();
       
streamer->SetInputConnection(m_pUnstructuredGridModel->GetOutputPort());
        streamer->SetStartPosition(0.0, 0.0, 0.0);
        streamer->SetSourceConnection(seeds->GetOutputPort());
        streamer->SetMaximumPropagation(100);
        streamer->SetIntegrator(sph_rk4);
        streamer->SetIntegratorTypeToRungeKutta4();
        streamer->SetMinimumIntegrationStep(m_CurrentMinValue);
        streamer->SetMaximumIntegrationStep(m_CurrentMaxValue);
        streamer->SetIntegrationDirectionToBoth();
        streamer->SetComputeVorticity(false);
        streamer->Modified();


What you think, I am missing in my code??

<http://vtk.1045678.n5.nabble.com/file/t342218/StreamTracer_problem.png> 



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