[vtkusers] Segfault on getting Dataset Coordinates

[Wagner Sales]

Hi all,

After a lot of tries to get dataset coordinates in a image, based on the
cell, and getting sometimes a pretty segfault, I produced the following code
( based on a VTK example ) and reproduced the error.
Someone can help telling whats can be wrong or if have another way to take
the dataset coordinates from a xyz based point? ( on this example I'm using
directly the number of cells ).

Regards,

Wagner Sales
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