[vtkusers] vtkParticleReader and vtkGlyph3D

[Sebastien Jourdain]

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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