[vtkusers] getcellneighbours of polydata

David Doria daviddoria+vtk at gmail.com
Fri May 28 13:38:04 EDT 2010

On Fri, May 28, 2010 at 12:38 PM, rashedk <rashed.vtk at googlemail.com> wrote:
> Now that's interesting. It seems we are having the same problem then. Does
> that mean there isn't an easy way of getting a cell's neighbours?
> Rashed.

The documentation of this function:
void vtkDataSet::GetCellNeighbors

Topological inquiry to get all cells using list of points exclusive of
cell specified (e.g., cellId). Note that the list consists of only
cells that use ALL the points provided.

I don't understand what that means? After looking at some use cases in
VTK, I came up with this:

  vtkSmartPointer<vtkIdList> ptIds =
  sphereSource->GetOutput()->GetCellPoints(cellId, ptIds);

  sphereSource->GetOutput()->GetCellNeighbors(cellId, ptIds, neighborCellIds);
  std::cout << "There are " << neighborCellIds->GetNumberOfIds() << "
neighbors." << std::endl;

It doesn't segfault, but it says there are 0 neighbors, which is not
true (it's a sphere!).

Can anyone explain what is going on here?



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