[vtkusers] vtkParticleReader and vtkGlyph3D
Sgouros, Thomas
thomas_sgouros at brown.edu
Tue Apr 3 16:54:39 EDT 2018
"It is often some unexpected minor thing that causes the failure."
I'm certain of that.
Here's the code, mostly pinched straight from the Glyph3D example. (And
I've tried swapping the endianness, just for giggles.) The data is an ASCII
vtk file that you can get from sgouros.com/output_p40.vtk.
Thank you,
-Tom
#include <vtkVersion.h>
#include <vtkSmartPointer.h>
#include <vtkCubeSource.h>
#include <vtkPolyData.h>
#include <vtkPoints.h>
#include <vtkGlyph3D.h>
#include <vtkCellArray.h>
#include <vtkPolyDataMapper.h>
#include <vtkActor.h>
#include <vtkRenderWindow.h>
#include <vtkRenderer.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkParticleReader.h>
#include <vtkPolyDataMapper.h>
int main(int argc, char* argv[]) {
std::string filePath = argv[1];
vtkSmartPointer<vtkParticleReader> reader =
vtkSmartPointer<vtkParticleReader>::New();
reader->SetFileName ( filePath.c_str() );
// if nothing gets displayed or totally wrong, swap the endianness
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->SetInputConnection(reader->GetOutputPort());
glyph3D->Update();
std::cout << *(reader->GetOutput()) << std::endl;
// Visualize
vtkSmartPointer<vtkPolyDataMapper> mapper =
vtkSmartPointer<vtkPolyDataMapper>::New();
mapper->SetInputConnection(glyph3D->GetOutputPort());
vtkSmartPointer<vtkActor> actor =
vtkSmartPointer<vtkActor>::New();
actor->SetMapper(mapper);
vtkSmartPointer<vtkRenderer> renderer =
vtkSmartPointer<vtkRenderer>::New();
vtkSmartPointer<vtkRenderWindow> renderWindow =
vtkSmartPointer<vtkRenderWindow>::New();
renderWindow->AddRenderer(renderer);
vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
vtkSmartPointer<vtkRenderWindowInteractor>::New();
renderWindowInteractor->SetRenderWindow(renderWindow);
renderer->AddActor(actor);
renderer->SetBackground(.3, .6, .3); // Background color green
renderWindow->Render();
renderWindowInteractor->Start();
return EXIT_SUCCESS;
}
On Tue, Apr 3, 2018 at 4:46 PM, Bill Lorensen <bill.lorensen at gmail.com>
wrote:
> 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
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>> _______________________________________________
> >>>>>> 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
> >>>>>>
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> >>>>>>
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> >>>>>>
> >>>>>
> >>>>
> >>>
> >>
> >
> >
> > _______________________________________________
> > 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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> >
>
>
>
> --
> Unpaid intern in BillsParadise at noware dot com
>
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