[vtkusers] How to get the input to a filter as algorithm output?

[Bill Lorensen]

ITK's smartpointers do all of the bookkeeping for you. There are
probably tricky pipeline issues that exist in vtk that don't exist is
itk.



On Tue, Dec 15, 2009 at 12:07 PM, Michael Jackson
<mike.jackson at bluequartz.net> wrote:
>
>
> On Dec 15, 2009, at 11:53 AM, Bill Lorensen wrote:
>
>> After seeing Berk's reply it looks as though his
>> vtkImageData* inputCopy = input->NewInstance();
>> inputCopy->ShallowCopy(input);
>> blend->AddInput(inputCopy);
>> blend->Update();
>> output->ShallowCopy(blend->GetOutput());
>>
>> would be:
>>
>> blend->AddInput(input);
>> blend->Update()
>> this->GraftOutput(blend->GetOutput());
>
> Bill,
>  As, Berk explained, you _really_ need to have a shallow copy to decouple
> the internal and external pipelines. If this is not done the all sorts of
> "Bad" will happen.
>
>  Maybe what is needed is this:
>
> /* Get a Shallow copy from the input */
> vtkImageData* inputCopy = input->NewShallowCopyInstance();
> blend->AddInput(inputCopy);
> blend->Update();
> output->ShallowCopy(blend->GetOutput());
> /* Don't Forget to memory clean up somewhere.*/
>
> _________________________________________________________
> Mike Jackson                  mike.jackson at bluequartz.net
> BlueQuartz Software                    www.bluequartz.net
> Principal Software Engineer                  Dayton, Ohio
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