[vtkusers] vtkParticleReader and vtkGlyph3D

[Sebastien Jourdain]

What you are doing seems correct and the data is valid (it has points).

How do you render the glyph3d filter? Using a polydata mapper? I'm guessing
no issue on that end?

Ideally you should use the glyph mapper instead of the filter. But if
memory is not a big deal, don't worry about it.

Seb

On Tue, Apr 3, 2018 at 1:47 PM, Sgouros, Thomas <thomas_sgouros at brown.edu>
wrote:

> This is reader->GetOutput()
>
> vtkPolyData (0x7f8ce050dad0)
>
>   Debug: Off
>
>   Modified Time: 217
>
>   Reference Count: 1
>
>   Registered Events: (none)
>
>   Information: 0x7f8ce050d9b0
>
>   Data Released: False
>
>   Global Release Data: Off
>
>   UpdateTime: 218
>
>   Field Data:
>
>     Debug: Off
>
>     Modified Time: 167
>
>     Reference Count: 1
>
>     Registered Events: (none)
>
>     Number Of Arrays: 0
>
>     Number Of Components: 0
>
>     Number Of Tuples: 0
>
>   Number Of Points: 10229
>
>   Number Of Cells: 10229
>
> It goes on for quite a bit more. As I said, when I feed this to a
> vtkPolyDataMapper, it displays and works fine, but I want little spheres,
> not little flat rectangles and I thought I could just redirect that into
> the vtkGlyph3D object, but I must be misunderstanding something.
>
> Thank you,
>
>  -Tom
>
> On Tue, Apr 3, 2018 at 3:26 PM, Sebastien Jourdain <
> sebastien.jourdain at kitware.com> wrote:
>
>> You can try to see what the GetOutput() contains as my assumption it
>> would be empty (No points => Number of Points: 0).
>>
>> reader->GetOutput()->PrintSelf(cout, vtkIndent(2));
>>
>> What I mean was
>>
>> glyph3D->SetInputConnection(reader->GetOutputPort());
>>
>>
>> On Tue, Apr 3, 2018 at 1:23 PM, Sgouros, Thomas <thomas_sgouros at brown.edu
>> > wrote:
>>
>>> Hi Sebastien:
>>>
>>> Sorry if that was unclear. The third block of code comes first, and
>>> reader->Update() is called before I use its GetOutput().  In situ, it looks
>>> like this:
>>>
>>>  ...
>>>   vtkSmartPointer<vtkParticleReader> reader =
>>> vtkSmartPointer<vtkParticleReader>::New();
>>>   reader->SetFileName ( filePath.c_str() );
>>>   reader->SetDataByteOrderToBigEndian();
>>>   reader->Update();
>>>
>>>   // Create anything you want here, we will use a cube for the demo.
>>>   vtkSmartPointer<vtkCubeSource> cubeSource =
>>>       vtkSmartPointer<vtkCubeSource>::New();
>>>
>>>   vtkSmartPointer<vtkGlyph3D> glyph3D =  vtkSmartPointer<vtkGlyph3D>::N
>>> ew();
>>>   glyph3D->SetSourceConnection(cubeSource->GetOutputPort());
>>>   glyph3D->SetInputData(reader->GetOutput());
>>>   glyph3D->Update();
>>>
>>>   ...
>>>
>>> I don't think I understand what you mean by the connection instead of
>>> the dataset directly.
>>>
>>> Is there a way to peek inside glyph3D and see what it thinks it has?
>>>
>>> Thank you,
>>>
>>>  -Tom
>>>
>>>
>>> On Tue, Apr 3, 2018 at 2:53 PM, Sebastien Jourdain <
>>> sebastien.jourdain at kitware.com> wrote:
>>>
>>>> Tom,
>>>>
>>>> Just make sure that reader->Update(); was called before
>>>> glyph3D->SetInputData(reader->GetOutput());
>>>> But it would be better to use the connection instead of the dataset
>>>> directly.
>>>>
>>>> Seb
>>>>
>>>> On Tue, Apr 3, 2018 at 12:27 PM, Sgouros, Thomas <
>>>> thomas_sgouros at brown.edu> wrote:
>>>>
>>>>> Hello all:
>>>>>
>>>>> Can someone help me understand why this code works:
>>>>>
>>>>>   vtkSmartPointer<vtkGlyph3D> glyph3D = vtkSmartPointer<vtkGlyph3D>::N
>>>>> ew();
>>>>>   glyph3D->SetSourceConnection(cubeSource->GetOutputPort());
>>>>>   glyph3D->SetInputData(polydata);
>>>>>   glyph3D->Update();
>>>>>
>>>>> And this does not (nothing displayed)?
>>>>>
>>>>>   vtkSmartPointer<vtkGlyph3D> glyph3D =  vtkSmartPointer<vtkGlyph3D>::N
>>>>> ew();
>>>>>   glyph3D->SetSourceConnection(cubeSource->GetOutputPort());
>>>>>   glyph3D->SetInputData(reader->GetOutput());
>>>>>   glyph3D->Update();
>>>>>
>>>>> The first clip is from https://www.vtk.org/Wiki/
>>>>> VTK/Examples/Cxx/Filtering/Glyph3D
>>>>>
>>>>> The 'reader' object is stolen from the ParticleReader example:
>>>>>
>>>>>   vtkSmartPointer<vtkParticleReader> reader =
>>>>> vtkSmartPointer<vtkParticleReader>::New();
>>>>>   reader->SetFileName ( filePath.c_str() );
>>>>>   reader->SetDataByteOrderToBigEndian();
>>>>>   reader->Update();
>>>>>
>>>>> The program compiles, but no data appears. It works fine (data
>>>>> appears) in the context of the ParticleReader example, where it shows all
>>>>> the data points. But I want to see them as glyphs, not little squares. I
>>>>> seem to be misunderstanding something fundamental, but not seeing what it
>>>>> could be.
>>>>>
>>>>> Many thanks,
>>>>>
>>>>>  -Tom
>>>>>
>>>>>
>>>>>
>>>>> _______________________________________________
>>>>> 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
>>>>>
>>>>> Follow this link to subscribe/unsubscribe:
>>>>> https://vtk.org/mailman/listinfo/vtkusers
>>>>>
>>>>>
>>>>
>>>
>>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://vtk.org/pipermail/vtkusers/attachments/20180403/a6d19f4d/attachment-0001.html>