[vtkusers] Addition of polylines

[forzakim]

Hello all,

I create a vtkPolyData object by manual operation and am going to create a
polyline. I want to add a cell(LINE) periodically. However, nothing is
displayed.


In initialization

    vtkRenderer *ren = vtkRenderer::New();
    vtkRenderWindow *renWin = vtkRenderWindow::New();
    renWin->AddRenderer(ren);
    vtkRenderWindowInteractor *iren = vtkRenderWindowInteractor::New();
    iren->SetRenderWindow(renWin);

    vtkPoints *polyPoints = vtkPoints::New();
    vtkCellArray *polyCells = vtkCellArray::New();
    vtkPolyData *polyline = vtkPolyData::New();
    polyline->SetPoints(polyPoints);
    polyline->SetLines(polyCells);

    vtkPolyDataMapper *polyMapper = vtkPolyDataMapper::New();
    polyMapper->SetInput(polyline);
    vtkActor *polyActor = vtkActor::New();
    polyActor->SetMapper(polyMapper);
    ren->AddActor(polyActor);


In every scan

    vtkPoints *Points = (vtkPoints*)(polyline->GetPoints());
    vtkCellArray *Cells = (vtkCellArray*)(polyline->GetLines());

    vtkIdType ptIds[2], cellId;
    ptIds[0] = Points->InsertNextPoint(&polydata[pt][0]);
    ptIds[1] = Points->InsertNextPoint(&polydata[pt+1][0]);
    cellId = Cells->InsertNextCell(2, ptIds);
    polyline->Update();

    pt++;


Any help will be appreciated.

Regards.
forzakim


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