[vtkusers] vtkTransformDataSet

[Bill Lorensen]

Interesting. I guess since it only operates on Points the
transformation code is the same. It must still output PolyData
however. I'm not familiar with the new pipeline, but I assume it will
be OK?

Bill

On Mon, Jan 18, 2010 at 12:54 PM, David Gobbi <david.gobbi at gmail.com> wrote:
> 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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