[vtkusers] converting common unstructurd grids to vtkUnstructuredGrids

[Dirk Fritz]

Hi,  
I have problems with unstructured grids.  I have a volume dataset, it is 
an unstructured grid.  The cell types are   variably, however very 
frequently cubes.  The connectivty list entries consist of one point and 
his neighbours. Therefore, a point of cube has six neighbours.  How can 
I create a vtkUnstructuredGrid. I want receive the isosurface in the 
end.  My Problem is, that I have only the neighbours of every point. And 
I don't know which Cell type I ought use. Is Convex Point the right?  Is 
there anyone, who has experience with converting common unstructurd 
grids to vtkUnstructuredGrids?

Thanks,

Dirk