[vtkusers] vtkImageDataGeometryFilter convenient for DEM

[Sebastien_MARAUX]

Hello again.

Would vtkImageDataGeometryFilter be convenient for
triangulating a DEM. (I am not interested in Delaunay 
triangulation, as it is far too slow for triangulating millions of
points) ?

I would just do a triangulation such as :

*--------*
| \  |  / |
|  \ | /  |
*---*---*
|  / | \  |
| /  |  \ |
*---*---*

alternating square diagonals direction
(I am not sure it will be clear enough ...)

will this function achieve this ?

Seb
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