[vtkusers] vtkParticleReader and vtkGlyph3D

[Bill Lorensen]

Post a small compilable example, please. It is often some unexpected
minor thing that causes the failure.

Thanks,

Bill

BTW: The wiki examples have been replaced by VTKExamples here:

https://lorensen.github.io/VTKExamples/site/


On Tue, Apr 3, 2018 at 1:43 PM, Sebastien Jourdain
<sebastien.jourdain at kitware.com> wrote:
> 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>::New();
>>>>   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>::New();
>>>>>>   glyph3D->SetSourceConnection(cubeSource->GetOutputPort());
>>>>>>   glyph3D->SetInputData(polydata);
>>>>>>   glyph3D->Update();
>>>>>>
>>>>>> And this does not (nothing displayed)?
>>>>>>
>>>>>>   vtkSmartPointer<vtkGlyph3D> glyph3D =
>>>>>> vtkSmartPointer<vtkGlyph3D>::New();
>>>>>>   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
>>>>>>
>>>>>>
>>>>>>
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>>>>>
>>>>
>>>
>>
>
>
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