[vtkusers] pick and update

[Boris Avdeev]

Thanks, that makes sense. However my problem still exists. This is the
code I have now:

    picksR = vtkPolyDataReader()
    picksR.SetFileName(fname)  #points
    picks = picksR.GetOutput()
    picks.Update()
    picks.SetSource(None)
    del picksR

    #reconstruct a surface from the scatteres points
    proxy = vtkSurfaceReconstructionFilter()
    proxy.SetInput(picks)
    surf = vtkContourFilter()
    surf.SetValue(0,0.0)
    surf.SetInput(proxy.GetOutput())

    surfMap = vtkPolyDataMapper()
    surfMap.SetInput(surf.GetOutput())
    surfAct = vtkActor()
    surfAct.SetMapper(surfMap)
    ren.AddActor(surfAct)

    def PickingFunction(obj, event):
        global picks, renWin
        picks.GetPoints().InsertNextPoint(obj.GetPicker().GetPickPosition())
        renWin.Render()      #The surface does not change

        writer = vtkPolyDataWriter()
        writer.SetFileName(fname)
        writer.SetInput(picks)
        writer.Write()            # This works fine

    iact.AddObserver("EndPickEvent", PickingFunction)

Any ideas?

Thanks,
Boris

On 1/30/06, David Gobbi <dgobbi at atamai.com> wrote:
> In Python you should never use Register() or Delete().  The python
> wrappers tie together the Python GC with VTK and call these for you
> automatically.
>
> If you want to keep the data around, you just have to keep a python
> reference to it around, you don't need to Register it.  Note that the
> data keeps a reference to the source, so you need to break the pipeline
> after the Update() if you want the source to be deleted.  In VTK 4, you
> would do data.SetSource(None).
>
>  - David
>