[vtkusers] vtkTransform to transform vtkImageData

[David E DeMarle]

vtkImageData is defined to be axis aligned so it can not be
arbitrarily transformed. Thus the cast in:
  vtkimageData test = (vtkImageData) work_axis.GetOutputDataObject(0);
can not work.

Try:
  vtkStructuredGrid test = (vtkStructuredGrid) work_axis.GetOutputDataObject(0);
instead.

David E DeMarle
Kitware, Inc.
R&D Engineer
21 Corporate Drive
Clifton Park, NY 12065-8662
Phone: 518-881-4909


On Fri, Jun 29, 2012 at 11:12 AM, David Doria <daviddoria at gmail.com> wrote:
> On Fri, Jun 29, 2012 at 11:10 AM, Jonathan Ruiz Peinado
> <jonathan.ruiz3 at gmail.com> wrote:
>> Sure,
>>
>> I think that I'm not getting the output from vtkTransformFilter correctly, I
>> did it the simplest way I though to see if I was lucky but seems that is not
>> that easy.
>>
>> Thinking a bit more I guess that vtkDataImage has to be built using the
>> output , but not sure how.
>>
>> ---------------------------------------------------
>>
>> vtkTransform work_axis_transform = new vtkTransform();
>> work_axis_transform.Translate(0,0,0);
>>
>> vtkTransformFilter work_axis = new vtkTransformFilter();
>> work_axis.SetTransform(work_axis_transform);
>>
>> work_axis.SetInput(DicomStudio.dicomImage.getOutput());
>> vtkimageData test = (vtkImageData) work_axis.GetOutputDataObject(0);
>> test.GetSpacing();
>> ----------------------------------------------------------------------------------------------------------
>>
>> test.getSpacing(); trying to access to a null pointer.
>>
>> Thanks.
>
> Try calling work_axis.Update() before trying to use any of its outputs.
>
> David
> _______________________________________________
> Powered by www.kitware.com
>
> Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html
>
> Please keep messages on-topic and check the VTK FAQ at: http://www.vtk.org/Wiki/VTK_FAQ
>
> Follow this link to subscribe/unsubscribe:
> http://www.vtk.org/mailman/listinfo/vtkusers