[vtk-developers] Bug with pcoords[2] in vtkQuad::EvaluatePosition()

[Mathieu Westphal]

Here is the results of my enquiries on different cell types for
evaluatePosition:
vtkEmptyCell : pcoords not set at all, nor any output parameters.
vtkVertex : pcoords[2] is not set
vtkPolyVertex : pcoords[1] and pcoords[2] are not set
vtkPolygon : pcoords[2] is not set
vtkQuad : pcoords[2] is not set

All other vtkCell implementation does set all pcoords, dist2 and
closestPoints

Do we set it to 0 ? do you know why vtkTriangle compute it this way when
this is a 2D cell? (vtkTriangle.cxx:142)

Mathieu Westphal

On Wed, May 27, 2015 at 6:10 PM, Berk Geveci <berk.geveci at kitware.com>
wrote:

> Ah! I confirm that this is a bug. Any code that generically works on 2D
> and 3D cells will trip over this in mixed 2D-3D cells situations as well as
> if the outer code does not initialize pcoords to 0 initially. So any cell
> type that uses a 2D parametric coordinate system should initialize the 3rd
> value to 0. Please submit a fix for quad and I'll review/approve it. If you
> have some cycles, I recommend checking the other 2D cells too...
>
> On Wed, May 27, 2015 at 11:48 AM, Joachim Pouderoux <
> joachim.pouderoux at kitware.com> wrote:
>
>> Sorry, here is the correct entry link:
>> http://www.vtk.org/Bug/view.php?id=15493
>>
>> *Joachim Pouderoux*
>>
>> *PhD, Technical Expert*
>> *Kitware SAS <http://www.kitware.fr>*
>>
>>
>> 2015-05-27 17:45 GMT+02:00 Berk Geveci <berk.geveci at kitware.com>:
>>
>>> Hi Mathieu,
>>>
>>> I don't see that issue in the tracker...
>>>
>>> -berk
>>>
>>>
>>> On Wed, May 27, 2015 at 10:04 AM, Mathieu Westphal <
>>> mathieu.westphal at kitware.com> wrote:
>>>
>>>> I've just submitted a bug in mantis
>>>> http://www.vtk.org/Bug/view.php?id=15491
>>>>
>>>> pcoords[2] is not overwrited when i think should.
>>>>
>>>> The thing is, this but may be present in every 2D cell type.
>>>> I've checked vtkTriangle, but this one seems ok, pcoords[2] is
>>>> overwriten.
>>>>
>>>> What do you think about it ?
>>>>
>>>> Mathieu Westphal
>>>>
>>>> _______________________________________________
>>>> Powered by www.kitware.com
>>>>
>>>> Visit other Kitware open-source projects at
>>>> http://www.kitware.com/opensource/opensource.html
>>>>
>>>> Search the list archives at:
>>>> http://markmail.org/search/?q=vtk-developers
>>>>
>>>> Follow this link to subscribe/unsubscribe:
>>>> http://public.kitware.com/mailman/listinfo/vtk-developers
>>>>
>>>>
>>>>
>>>
>>> _______________________________________________
>>> Powered by www.kitware.com
>>>
>>> Visit other Kitware open-source projects at
>>> http://www.kitware.com/opensource/opensource.html
>>>
>>> Search the list archives at:
>>> http://markmail.org/search/?q=vtk-developers
>>>
>>> Follow this link to subscribe/unsubscribe:
>>> http://public.kitware.com/mailman/listinfo/vtk-developers
>>>
>>>
>>>
>>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://public.kitware.com/pipermail/vtk-developers/attachments/20150528/ec4f6463/attachment.html>