[vtkusers] Dose mapping on a CT image

[Jothybasu Selvaraj]

If you just want to draw a line from the output of vtkContourFilter, you
simply set the output of contourFilter to vtkPolyDataMapper.

On Wed, Oct 10, 2012 at 5:24 PM, Abhishek Gupta <abhishek at meddiff.com>wrote:

> Hello Jothy,
>
> I am using following code to generate contours:
>
> ---------------------------------------------------------------------------------
>        //Set vktImage.
> vtkImageData* _vtkImage = vtkImageData::New();
>  _vtkImage->SetDimensions(dfData->cols,dfData->rows,1);
> double spacing[3] = { 2.5,2.5,1.0 }; // TODO: fix me
>  _vtkImage->SetSpacing(spacing);
> _vtkImage->GetPointData()->SetScalars(scalars);
>  /*double bounds[6];
> _vtkImage->GetBounds(bounds);*/
> _vtkImage->Update();
>  _vtkImage->Print(cerr);
>
> // Generate contours.
> vtkContourFilter* contour=vtkContourFilter::New();
>  contour->SetInput(_vtkImage);
> contour->GenerateValues(1,level,level);
>  contour->Update();
> contour->Print(cerr);
> contour->GetOutput()->GetPoints()->Print(cerr);
>  int numOfPoints=contour->GetOutput()->GetPoints()->GetNumberOfPoints();
> if(numOfPoints>0)
>  {
>  for(int i=0;i<numOfPoints;i++)
>  {
> dosePlotPoint p;//=new dosePlotPoint();
> p.x=contour->GetOutput()->GetPoints()->GetPoint(i)[0];
>  p.y=contour->GetOutput()->GetPoints()->GetPoint(i)[1];
> outPoints.push_back(p);
>  }
> }
>
> --------------------------------------------------------------------------------------------------
> I wish to obtain contour points in a manner that I can draw a path through
> those points.
>
> Regards,
> Abhishek Gupta.
>
> On Wed, Oct 10, 2012 at 7:29 PM, Jothybasu Selvaraj <jothybasu at gmail.com>wrote:
>
>> I don't know how you are obtaining the points form vtkContourFilter. What
>> exactly do you want to do?
>>
>> I think; vtkCOntourFilter can generate multiple contour lines depending
>> on the GenerateValues() parameters.
>>
>> On Wed, Oct 10, 2012 at 2:52 PM, abhishek <abhishek at meddiff.com> wrote:
>>
>>> Dear Jothy,
>>>
>>> I applied your suggestions in my code and spacing problem seems to be
>>> addressed. Now I have plotted a path over the points generated by contour
>>> filter. Please see the attached image.
>>>
>>> I saw the output of vtkContourFilter and it is returning points for
>>> vtkLines. How can I get only outline points?
>>>
>>> Regards,
>>> Abhishek.
>>>
>>> *Untitled.png* (79K) Download Attachment<http://vtk.1045678.n5.nabble.com/attachment/5716583/0/Untitled.png>
>>>
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>>
>>
>> --
>> Jothybasu Selvaraj
>> PhD Student
>> University of Liverpool
>> UK
>>
>>
>


-- 
Jothybasu Selvaraj
PhD Student
University of Liverpool
UK
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