[vtkusers] 3D image as N cubes

[Francisco Lopez de la Franca]

Thanks a lot.
And is there an example on how to traverse the whole octree? I mean, i
would like to know how many points there are per octant.
And finally, independently on the image, if i create an octree with a fixed
level, will the representation be the same? I mean, the same number of
octants with the same distribution independently on the image?
Thank you very much.
My best regards.
El 03/06/2015 15:36, "Bill Lorensen" <bill.lorensen at gmail.com> escribió:

> This example may help:
> http://www.vtk.org/Wiki/VTK/Examples/Cxx/DataStructures/OctreeVisualize
>
>
> On Wed, Jun 3, 2015 at 8:48 AM, Francisco Lopez de la Franca
> <franciscolopezdelafranca at gmail.com> wrote:
> > Hi.
> > I've created an example (see below) but everything is OK except that the
> > output image is not created. I'd be very pleased if someone can help me
> > (maybe with an explanatory example or whatever).
> >
> >     char* filename = new char[255];
> >     strcpy(filename, "nifti_image.nii");
> >
> >     vtkSmartPointer<vtkNIFTIImageReader> reader =
> > vtkSmartPointer<vtkNIFTIImageReader>::New();
> >
> >     reader->SetFileName(filename);
> >     reader->Update();
> >
> >     //Create the octree
> >     vtkSmartPointer<vtkOctreePointLocator> octree =
> > vtkSmartPointer<vtkOctreePointLocator>::New();
> >     octree->SetDataSet((vtkDataSet*) reader->GetOutput());
> >     octree->BuildLocator();
> >
> >     std::cout << "Number of cells in tree: " <<
> > octree->GetDataSet()->GetNumberOfCells() << std::endl;
> >     std::cout << "Number of points in tree: " <<
> > octree->GetDataSet()->GetNumberOfPoints() << std::endl;
> >
> >     char* outfile = new char[255];
> >     strcpy(outfile, "OcTree.vtp");
> >
> >     vtkSmartPointer<vtkXMLPolyDataWriter> writer =
> > vtkSmartPointer<vtkXMLPolyDataWriter>::New();
> >     writer->SetInputData((vtkPolyData*) octree->GetDataSet());
> >     writer->SetFileName(outfile);
> >     writer->Write();
> >
> >
> > 2015-05-29 12:40 GMT+02:00 Francisco Lopez de la Franca
> > <franciscolopezdelafranca at gmail.com>:
> >>
> >> Hi everybody,
> >> I'd like to represent a 3D image as a fixed number of cubes, I mean,
> >> something like a spatial occupancy matrix in 3D.
> >>
> >> Could you, please, recommend me a fast way to do it or does it exist  a
> >> data structure in VTK to achieve this?
> >>
> >> I've found the OcTree structure but I donot know if it is valid for
> this.
> >>
> >> Thank you very much.
> >> My best regards.
> >> /Francisco
> >
> >
> >
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>
> --
> Unpaid intern in BillsBasement at noware dot com
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