[Insight-users] Marching Cubes itkReadITKImage3DSegmentShowVTK

[prabhat246]

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
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> Insight-users at itk.org
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> 
> 

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