[vtkusers] vtkAppendPolyData RemoveInputData leads to 0 connections

[Bill Lorensen]

If you are concerned about seeing the error message, you can catch it.
http://www.vtk.org/Wiki/VTK/Examples/Cxx/Utilities/ObserveError

On Jan 25, 2017 8:53 AM, "Schober Beatrix [STEMMER IMAGING GmbH]" <
b.schober at stemmer-imaging.de> wrote:

> Hi,
>
> it seems to be an easy issue, but I don’t get the solution. I am appending
> multiple vtkPolyData to vtkAppendPolyData:
>
>
>
> vtkSmartPointer<vtkAppendPolyData> appendFilter = vtkSmartPointer<
> vtkAppendPolyData>::New();
>
> appendFilter->AddInputData(polyData1);
>
> appendFilter->AddInputData(polyData2);
>
>
>
> In another functions I want to hide / show those polydata:
>
>
>
> Function to hide:
>
> appendFilter->RemoveInputData(polyDataX);
>
> appendFilter->Update();
>
>
>
> Function to show:
>
> appendFilter->AddInputData(polyDataX);
>
> appendFilter->Update();
>
>
>
> This works fine, unless I have only one polydata in the vtkAppendPolyData
> filter. If I hide (see Function to hide) this last polydata I get following
> error after appendFilter->Update():
>
> Input port 0 of algorithm vtkAppendPolyData has 0 connections.
>
>
>
> The error message is clear, but how would you solve this? Is there a
> better way to do that?
>
>
>
> Thank you very much in advance!
>
>
>
> Sincerely,
>
>
>
> Bea
>
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