[vtk-developers] vtkAngularPeriodicFilter and vtkTransformFilter

[Sujin Philip]

Hi Dave,

The transform filter does transform one normal and one vector array, but
ignores any others. It treats the normals as special (multiplies by the
transposed inverse matrix).

-Sujin


On Thu, Mar 10, 2016 at 10:55 AM, David E DeMarle <dave.demarle at kitware.com>
wrote:

> I believe transform filter doesn't transform vector results because it
> should not transform normals and similar quantities which would be
> invalidated by the transformation.
>
>
>
> David E DeMarle
> Kitware, Inc.
> R&D Engineer
> 21 Corporate Drive
> Clifton Park, NY 12065-8662
> Phone: 518-881-4909
>
> On Thu, Mar 10, 2016 at 9:32 AM, Mathieu Westphal <
> mathieu.westphal at kitware.com> wrote:
>
>> Afair, the vtkTransform usage in vtkAngularPeriodicFilter was only a
>> fallback solution when vtkAngularPeriodicDataArray could not be used for
>> some reason, it is not efficient and is (or at least should) generating a
>> warning when used.
>>
>> No advice concerning the vtkTransform changes.
>>
>> Mathieu
>>
>>
>> Mathieu Westphal
>>
>> On Thu, Mar 10, 2016 at 3:27 PM, Sujin Philip <sujin.philip at kitware.com>
>> wrote:
>>
>>> Hi Developers,
>>>
>>> I am working on some changes to vtkAngularPeriodicFilter and I have
>>> noticed that for some cases it uses vtkTransformFilter to generate the
>>> result, instead of using mapped arrays (vtkAngularPeriodicDataArray).
>>>
>>> Going through the code, it looks like vtkTransformFilter behaves
>>> differently than vtkAngularPeriodicFilter. Any field that has 3 or 9
>>> components is transformed in vtkAngularPeriodicFilter but
>>> vtkTransformFilter only transforms the normal
>>> (vtkDataSetAttributes::GetNormals()) and vector
>>> (vtkDataSetAttributes::GetVectors()) arrays.
>>>
>>> I am thinking of changing vtkTransformFilter to apply transformation on
>>> all 3 and 9 components arrays. I wanted to know if there is any reason this
>>> should not be done.
>>>
>>> Thanks
>>> Sujin
>>>
>>>
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>>
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