[vtk-developers] SetInput fails?

[Tim Peeters]

Sorry I partially gave you the wrong code. It should be this:

vtkTensorToEigensystemFilter* eigen = vtkTensorToEigensystemFilter::New();
// dti is a valid vtkImageData object
eigen->SetInput(dti);
vtkImageData* eigenIn = eigen->GetInput();
// eigenIn == NULL

eigen->Update() fails because the filter does not have an input connection :s.
It really puzzles me because I call SetInput(..) with a valid dataset,
and this function calls the SetInputConnection() function of the
filter. But after that I get lost in pipelines and Executives and have
not been able to find out what goes wrong.

Tim.


On Fri, May 28, 2010 at 20:55, Jeff Baumes <jeff.baumes at kitware.com> wrote:
> On Fri, May 28, 2010 at 2:53 PM, Tim Peeters <thjmpeeters at gmail.com> wrote:
>> Dear developers,
>>
>> I am developing a VTK-based application that uses a plug-in system to
>> add functionality to the core system.
>> I am loading plug-ins (which are loaded as DLL's on Windows) using the
>> Qt plugin system.
>>
>> The following code, in one of the plugins, fails:
>>
>> vtkTensorToEigensystemFilter* eigen = vtkTensorToEigensystemFilter::New();
>> // dti is a valid vtkImageData object
>> eigen->SetInput(dti);
>> vtkImageData* eigenOut = eigen->GetOutput();
>> // eigenOut == NULL
>
> You are missing eigen->Update(), which will actually run your filter,
> before you get the output.
>