[Insight-users] Marching Cubes itkReadITKImage3DSegmentShowVTK

[Luis Ibanez]

Hi Prabha,

Since you are looking for information about a VTK class,
you should post this question to the vtkusers list.

You will find a stronger VTK experitise in that list.


     Regards,


         Luis


---------------------
prabhat246 wrote:
> Oh,
> 
> I referred vtkMarchingCubes.cxx
> 
> Thanks
> 
> Prabhat
> 
> 
> Luis Ibanez wrote:
> 
>>
>>
>>Hi Prabhat,
>>
>>
>>Please clarify *exactly* what file
>>
>>               "MarchingCubes.cxx"
>>
>>are you referring to.
>>
>>Is this file in ITK ?
>>
>>Is it in VTK ?
>>
>>
>>     Please let us know,
>>
>>
>>       Thanks
>>
>>
>>          Luis
>>
>>
>>-------------------
>>prabhat246 wrote:
>>
>>>Thanks for providing such interesting piece of information.
>>>
>>>Well, I've changed the code 
>>>
>>>     vtkContourFilter * contour = vtkContourFilter::New();
>>>     contour->SetInput( vtkImporter2->GetOutput() );
>>>     contour->SetValue(0, 128);
>>>
>>>
>>>to
>>>
>>>     vtkMarchingCubes * contour = vtkMarchingCubes::New();
>>>     contour->SetInput(vtkImporter1->GetOutput());
>>>     contour->SetValue(0, 128); 
>>>
>>>It ensures that now I get output only from Marching cubes algo.
>>>I am new to learn this algorithm. 
>>>can you please explain what are these parameters of SetValue
>>>and how can I change the cube size to be bigger.
>>>
>>>Also can you tell me, in MarchingCubes.cxx which function actually
>>>executes
>>>the algorithm??
>>>
>>>Thanks a lot.
>>>
>>>Prabhat
>>>
>>>
>>>Luis Ibanez wrote:
>>>
>>>
>>>>Hi Prabhat,
>>>>
>>>>The surface extraction in this example is performed by the VTK filter
>>>>
>>>>                    vtkContourFilter
>>>>http://www.vtk.org/doc/nightly/html/classvtkContourFilter.html
>>>>
>>>>
>>>>you will find the relevant code in lines 185-196
>>>>
>>>>
>>>>    // Draw contours around the segmented regions
>>>>    vtkContourFilter * contour = vtkContourFilter::New();
>>>>    contour->SetInput( vtkImporter2->GetOutput() );
>>>>    contour->SetValue(0, 128);
>>>>
>>>>    polyMapper->SetInput( contour->GetOutput() );
>>>>
>>>>
>>>>
>>>>"Marching Cubes" is one among several other algorithms that this filter
>>>>can execute. If you look at the collaboration diagram in the HTML
>>>>Doxxygen-generated documentation (above), you will find the filters:
>>>>
>>>>
>>>>           vtkGridSynchronizedTemplates3D
>>>>           vtkSynchronizedTemplates3D
>>>>           vtkGridSynchronizedTemplates2D
>>>>           vtkSynchronizedTemplates2D
>>>>
>>>>
>>>>as the potential delegates for implementing this task.
>>>>Note that "Marching Cubes" is not in the list.
>>>>
>>>>
>>>>
>>>>One of the reasons why alternative implementations to Marching Cubes
>>>>are available, is the GE patented Marching Cube algorithms, and in this
>>>>way deprived the larger community from using it.  This intellectual
>>>>monopolization resulted in the creation of alternative algorithms.
>>>>
>>>>
>>>>
>>>>One interesting counter-example of how patents promote progress....  :-)
>>>>
>>>>      This time by forcing people to invent new
>>>>      methods *different* from the patented ones   :-)
>>>>
>>>>
>>>>BTW:
>>>>
>>>>   The Marching Cubes patent has now expired, and the algorithm,
>>>>   after 20 years of monopoly has entered the public domain.
>>>>
>>>>
>>>>
>>>>
>>>>   Luis
>>>>
>>>>
>>>>
>>>>-------------------
>>>>prabhat246 wrote:
>>>>
>>>>
>>>>>I wanted to run marching cubes on my Dicom image set.
>>>>>I was told to refer example
>>>>>
>>>>>InsightApplications-3.4.0\Auxiliary\vtk\ itkReadITKImage3DSegmentShowVTK
>>>>>
>>>>>I can successfully run this example. 
>>>>>but I could not find where the actual Marching cube algorithm is being
>>>>>called?
>>>>>also How can I change the parameters of Marching cube algorithm?
>>>>>(If I want output mesh to be coarse or dense)
>>>>>
>>>>>Thanks a lot.
>>>>>Prabhat
>>>>
>>>>_______________________________________________
>>>>Insight-users mailing list
>>>>Insight-users at itk.org
>>>>http://www.itk.org/mailman/listinfo/insight-users
>>>>
>>>>
>>>
>>>
>>_______________________________________________
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>>
>>
> 
>