[vtkusers] vtkTransformDataSet

[David Gobbi]

I was curious so I did a quick diff between them.  IMHO there is no
longer any reason for TransformPolyDataFilter to be anything but an
alias to TransformFilter.  The only differences are:

TransformFilter does this:

  output->CopyStructure(input);

while TransformPolyDataFilter does this:

  output->SetVerts(input->GetVerts());
  output->SetLines(input->GetLines());
  output->SetPolys(input->GetPolys());
  output->SetStrips(input->GetStrips());

Also, oddly, TransformFilter does some copying of FieldData that
TransformPolyDataFilter doesn't do... so maybe TransformFilter is
duplicating some work that the pipeline does automatically?

   David


On Mon, Jan 18, 2010 at 10:31 AM, Bill Lorensen <bill.lorensen at gmail.com> wrote:
> I believe TransformPolyDataFilter is optimized for polydata(as is
> stated in the header). Looking at the source is a good exercise.
>
> Bill
>
> On Mon, Jan 18, 2010 at 12:20 PM, David Doria <daviddoria+vtk at gmail.com> wrote:
>> On Mon, Jan 18, 2010 at 12:16 PM, David Gobbi <david.gobbi at gmail.com> wrote:
>>> On Mon, Jan 18, 2010 at 10:03 AM, David Doria <daviddoria+vtk at gmail.com> wrote:
>>>> There is a vtkTransformPolyDataFilter, but what about
>>>> vtkTransformStructuredGridFilter and
>>>> vtkTransformUnstructuredGridFilter? Couldn't these all be accomplished
>>>> with a vtkTransformDataSet filter?
>>>>
>>>> How would you currently transform an unstructured grid?
>>>>
>>>> Thanks,
>>>>
>>>> David
>>>
>>> The vtkTransformFilter is supposed to do those things, it works on all
>>> vtkPointSet derived data object, which includes all the ones you
>>> mentioned.  A generic vtkTransformDataSetFilter isn't possible because
>>> for some data sets (i.e. vtkImageData) the points in the data are
>>> implicit and must stay aligned with the x, y, and z axes.
>>>
>>>   David
>>>
>>
>> I see. So why is there a vtkTransformPolyDataFilter if you can
>> transform a PolyData with vtkTransformFilter?
>>
>> Thanks,
>>
>> David
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