[vtkusers] 3D image as N cubes

[Francisco Lopez de la Franca]

Hi again,
Could anybody tell what is the difference between vtkoctreepointlocator and
vtkhyperoctree? I am using the former for ceating an octree from an image,
but i donot know which one is the best. My intention is mainly to know how
many points there are per octant.
Thank you very much.
My best regards.

El miércoles, 3 de junio de 2015, Francisco Lopez de la Franca <
franciscolopezdelafranca at gmail.com> escribió:

> 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
> <javascript:_e(%7B%7D,'cvml','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
>> <javascript:_e(%7B%7D,'cvml','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
>> <javascript:_e(%7B%7D,'cvml','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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