[vtkusers] Fwd: problems with GetCellNeighbors

[Bill Chivas]

I'm confused with the parameters of
vtkUnstructuredGrid::GetCellNeighbors(vtkIdType
cellId, vtkIdList* ptIds, vtkIdList* cellIds).
Let's say i have an unstructured grid of tetrahedra elements.
And i want to get the neighbors of cell with id==1.

grid->GetCellNeighbors(cellId, ptIds, cellIds) //cellId should be ==1


1) cellid is the "cell" with id==1 for which i want its neighbors. As "cell"
is the tetrahedron cell with id==1 or one of its faces (triangle cell)?
2) ptIds are cell's(tetrahedron's) points or one of its faces' points?
3) cellIds are (neighboring) tetrahedra or (neighboring) faces?

>From an old post i found:
Dominik Szczerba wrote "GetCellNeighbours needs cell face points and not
cell points. It returns cell face neighbours and not all neighbours." (old
post-2006 year).
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