[vtkusers] vtkFollower

[Max]

Hi VTKers,
I use the vtkFollower filter to show the line always up,
but it is shown not in the location p1 and p2.
Code:

 //show needle tip
            vtkLineSource lineSource = new vtkLineSource();
            lineSource.SetPoint1(firstSegment.StartPoint.X,
firstSegment.StartPoint.Y, firstSegment.StartPoint.Z);
            lineSource.SetPoint2(firstSegment.StartPoint.X,
firstSegment.StartPoint.Y + lineShape.LineRadius,
firstSegment.StartPoint.Z);
            lineSource.Update();

          
            vtkPolyDataMapper tubeMapper = vtkPolyDataMapper.New();
            tubeMapper.SetInputConnection(lineSource.GetOutputPort());
            //tubeMapper.ScalarVisibilityOff();

            //vtkActor actor = new vtkActor();
            //actor.SetMapper(tubeMapper);

            vtkFollower textActor = new vtkFollower();
            textActor.SetMapper(tubeMapper);
            textActor.SetCamera(firstLayerRenderer.GetActiveCamera());



            firstLayerRenderer.AddActor(textActor);

When I use a vtkActor and not vtkFollower the location is ok, but i lose the
effect of line always up...
How can I get the line always up and in the correct position?

Thank you,
Max




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