[Insight-users] CellInterface & PolygonCell & Region

[Ofri Sadowsky]

Hi,


 1
---
I look at the documentation for itk::CellInterface and itk::PolygonCell.

My hypothesis was, that these should have compatible interfaces, as
PolygonCell is a case of CellInterface. But they seem to be
incompatible: PolygonCell declares the method AddPointId() and
CellInterface does not.

If I want to insert a PolygonCell into a Mesh, I do the following:

 typedef itk::Mesh<PixelType, VDimension> MeshType;
 typedef MeshType::CellType CellType;
 typedef CellType::CellAutoPointer CellAutoPointer;
 typedef itk::PolygonCell<CellType> PolygonType;

 MeshType::Pointer _mesh;
 CellAutoPointer _polygonCellPtr;

_mesh = MeshType::New();
 _polygonCellPtr.TakeOwnership(new PolygonType); /* (1) */
 _mesh->SetCell(0, cellptr);


But I could not use AddPointId() on my _polygonCellPtr, because it only
allows access to the methods of CellInterface.
I tried to make my CellAutoPointer a itk::AutoPointer<PolygonCell>, but
then I fell into type incompatibility in (1).

How do I get out of this?



 2
---
the classes ImageRegion and ImageIORegion declare a public method
IsInside() but MeshRegion does not seem to have one. I would question
the usability of a Region object without a function of this sort.
Furthermore, MeshRegion hardly declares any public methods. Are there
plans to extend MeshRegion, or should I avoid using it?



Thanks,

   Ofri.