[vtkusers] UnstructuredGrid to Graph

[Fabian, Nathan]

Hi David,

It looks to me like the loop where you iterate over points and GetConnectedVertices() is where it's most expensive. You can replace that behavior with the vtkUnstructuredGrid::GetCells().

Iterating over that vtkCellArray and iterating over the pts returned from GetCell() may be faster.  You'll need to build a switch around cell type to understand what that connectivity is, but I think after removing GetConnectedVertices(), the code size won't change too much...

HTH,
Nathan.

On 5/21/10 7:35 AM, "David Doria" <daviddoria+vtk at gmail.com> wrote:

I am trying to convert all of the edges in an vtkUnstructuredGrid to a vtkGraph.

Here is what I have come up with:
http://www.rpi.edu/~doriad/VTK_List/UnstructuredGridToGraph/

It seems to be horribly slow. Can anyone recommend a faster way to do this?

Thanks,

David
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