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

[Thomas Lambertz]

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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