[vtkusers] vtkTransform to transform vtkImageData

[David E DeMarle]

You could use a probe filter to resample the data onto a new image
data, but that image data itself will be axis aligned too. The net
effect will be similar to the output of the reslice filter Jothybasu
suggested, but it will be less efficient to compute than reslice.

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 11:23 AM, Jonathan Ruiz Peinado
<jonathan.ruiz3 at gmail.com> wrote:
> Ok, but I'll need vtkImageData to use it as input of another object, how
> could I get vtkTransformFilter output to build and imagedata object ?
>
> thanks
>
> 2012/6/29 David E DeMarle <dave.demarle at kitware.com>
>>
>> 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
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>