[Insight-users] Marching Cubes itkReadITKImage3DSegmentShowVTK

[prabhat246]

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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