[vtkusers] Weird Bounds after vtkCutter

[Cory Quammen]

On Tue, Nov 3, 2015 at 9:11 AM, Romain LEGUAY <romain.leguay at gmail.com>
wrote:

> Thank you Cory for your answer.
>
> I attach my code with the CMake file. Maybe my first cut on my mesh does
> nothing because on other cut, the bound values seems quite good.
>

Yeah. The first plane cuts on the very edge of the object, yielding 0 cells
and 0 points. I tested this with your code on the armadillo.obj file that
you can find with some Googling. Since there are no points, the bounds are
left in their default invalid state.

HTH,
Cory


> In this code, I first use vtkCutter then vtkContourTriangular but I have
> the same result (the first cut give me some weird bounds).
>
> Thanks again!
>
> Romain
>
>
> 2015-11-03 14:47 GMT+01:00 Cory Quammen <cory.quammen at kitware.com>:
>
>> Romain,
>>
>> I don't see anything wrong with the code you posted. Could you post a
>> complete example that can be compiled and tested and which shows your
>> problem?
>>
>> I tried using your cutter code with a vtkSphereSource instead of an OBJ
>> reader and it seemed to work fine.
>>
>> Thanks,
>> Cory
>>
>> On Tue, Nov 3, 2015 at 4:09 AM, Romain LEGUAY <romain.leguay at gmail.com>
>> wrote:
>>
>>> Hello everyone,
>>>
>>> I applied the filter vtkCutter to a mesh and I want to get the bounds of
>>> the result contours.
>>>
>>> The bounds of the mesh seem goods.
>>>
>>> When I display the vtkCutter output result, I see the expected result
>>> but I obtained those bound values: xmin = ymin = zmin = 1.0, and xmax =
>>> ymax = zmax = -1.0.
>>>
>>> I don't understand what I did wrong in my code:
>>>
>>> // Create a plane of the current Y-axis
>>> vtkSmartPointer<vtkPlane> plane = vtkSmartPointer<vtkPlane>::New();
>>> plane->SetOrigin(0,0,0);
>>> plane->SetNormal(0,1,0);
>>> // Cut the mesh -> contours creation
>>> vtkSmartPointer<vtkCutter> cutter = vtkSmartPointer<vtkCutter>::New();
>>> cutter->SetCutFunction(plane);
>>> cutter->SetInputConnection(readerOBJ->GetOutputPort());
>>> cutter->Update();
>>>
>>> double boundsCutter[6];
>>> cutter->GetOutput()->GetBounds(boundsCutter); // [1.0, -1.0, 1.0, -1.0,
>>> 1.0, -1.0]
>>>
>>>
>>> Do I need to do another update?
>>>
>>> Thank you,
>>>
>>> Romain
>>>
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>>
>>
>> --
>> Cory Quammen
>> R&D Engineer
>> Kitware, Inc.
>>
>
>
> _______________________________________________
> Powered by www.kitware.com
>
> Visit other Kitware open-source projects at
> http://www.kitware.com/opensource/opensource.html
>
> Please keep messages on-topic and check the VTK FAQ at:
> http://www.vtk.org/Wiki/VTK_FAQ
>
> Search the list archives at: http://markmail.org/search/?q=vtkusers
>
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>


-- 
Cory Quammen
R&D Engineer
Kitware, Inc.
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