[vtk-developers] vtkAngularPeriodicFilter and vtkTransformFilter

[David Gobbi]

Fifteen years ago when I wrote the TransformPointsNormalsVectors() method,
VTK was much simpler.  The code should probably be generalized to handle
more attributes.

 - David


On Thu, Mar 10, 2016 at 9:23 AM, Sujin Philip <sujin.philip at kitware.com>
wrote:

> 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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>>
>
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