[Insight-users] Error: it says Undefining object , please have a look

[Thomas Lambertz]

Hi Tony,

i havent worked with meshes - so i cannot give you some detailed code.

You may have a look into the code embedded in 
http://www.itk.org/pipermail/insight-users/2004-March/007501.html

It seemes to work with iterators on meshes.

Hth,
Tom



tony hakki wrote:
> Could you please suggest me an example to convert itk mesh to  vtk 
> polydata,I haven't accomplished such a easy application yet,And I am 
> really angry with mymeslf,please help me
>
>
>  
> ----- Original Message ----
> From: Thomas Lambertz <thomas at hexerei-software.de>
> To: insight-users at itk.org
> Sent: Thursday, February 1, 2007 2:17:28 PM
> Subject: Re: [Insight-users] Error: it says Undefining object , please 
> have a look
>
> Hi Tony,
>
> you may have a look into Chapter 11 of the itkSoftwareGuide - its about
> using iterators.
>
> Seemes you missed your type declartions - something like
>
> typedefitk::Image<float,3>ImageType;
> typedefitk::ImageRegionConstIterator<ImageType>ConstIteratorType;
> typedefitk::ImageRegionIterator<ImageType>IteratorType;
>
> (keep in mind that this is for itkImage and not itkMesh)
>
> Hth,
> Tom
>
>
> tony hakki wrote:
> > Hello All;
> > I converted vtk polydata to itk mesh. Now I would like to convert that
> > mesh to the vtk poly data for testing if first converting right. To
> > convert mesh to vtk poly data I would like to use the following code
> > ,bur unfortunately it gives an error ,I have also indicated that line
> > with red below.
> >  
> > I want to convert Itk mesh to vtk poly data.
> > vtkPolyData* ITKMeshToVtkPolyData( MeshType::Pointer *mesh* )
> > {
> >   //Creat a new vtkPolyData
> >   vtkPolyData* newPolyData = vtkPolyData::New();
> >
> >   //Creat vtkPoints for insertion into newPolyData
> >   vtkPoints *points = vtkPoints::New();
> >   std::cout<<"Points = "<<*mesh*->GetNumberOfPoints()<<std::endl;
> >
> >   //Copy all points into the vtkPolyData structure
> >   PointIterator pntIterator = *mesh*->GetPoints()->Begin(); // it says
> > PointIterator  is Undefining
> >   PointIterator pntItEnd = *mesh*->GetPoints()->End();
> >   for (int i = 0; pntIterator != pntItEnd; ++i, ++pntIterator)
> >     {
> >     ItkPoint pnt = pntIterator.Value(); // also here it says
> > ItkPoint is undefining ,How can I define them??
> >     points->InsertPoint(i, pnt[0], pnt[1], pnt[2]);
> > //       std::cout<<i<<"-th point:  ";
> > //       std::cout<<pnt[0]<<std::endl;
> > //       std::cout<<"               "<<pntIterator.Value()<<std::endl;
> > //      ++pntIterator;
> >     }
> >   newPolyData->SetPoints(points);
> >   points->Delete();
> >
> >   //Copy all cells into the vtkPolyData structure
> >   //Creat vtkCellArray into which the cells are copied
> >   vtkCellArray* triangle = vtkCellArray::New();
> >   CellIterator cellIt = *mesh*->GetCells()->Begin();
> >   CellIterator cellItEnd = *mesh*->GetCells()->End();
> >   for (int it = 0; cellIt != cellItEnd; ++it, ++cellIt)
> >     {
> >     CellType * cellptr = cellIt.Value();
> >     //    LineType * line = dynamic_cast<LineType *>( cellptr );
> >     //    std::cout << line->GetNumberOfPoints() << std::endl;
> >     //      std::cout << cellptr->GetNumberOfPoints() << std::endl;
> >     PointIdIterator pntIdIter = cellptr->PointIdsBegin();
> >     PointIdIterator pntIdEnd = cellptr->PointIdsEnd();
> >     vtkIdList* pts = vtkIdList::New();
> >     for (; pntIdIter != pntIdEnd; ++pntIdIter)
> >       {
> >       pts->InsertNextId( *pntIdIter );
> >       //          std::cout<<"           "<<tempCell[it1]<<std::endl;
> >       }
> >     triangle->InsertNextCell(pts);
> >     }
> >   newPolyData->SetPolys(triangle);
> >   triangle->Delete();
> >
> >   // return the vtkUnstructuredGrid
> >   return newPolyData;
> > }
> >  
> > Thank you
> > Tony
> >
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