[vtkusers] vtkThreshold question

[Amy Squillacote]

Hi Randall,

vtkThreshold should be able to handle vtkPolyData; it accepts any type 
of vtkDataSet as input, and there's no apparent limitation on the type 
of cells that can be contained in the dataset to be thresholded. Would 
you please post the stack trace? If you have a small dataset that can be 
used to reproduce the problem (and that you would be able to post), that 
would be very helpful as well.

- Amy

Randall Hand wrote:
> I have some code to load ADCIRC data into memory as vtkPolyData.  It's 
> been working great until yesterday when I tried to pass it to a 
> vtkThreshold to eliminate some of the "masked" values, and it 
> segfaulted.  a backtrace showed it somewhere in a 
> vtkDataArray::GetValue call.
>
> I fought with it for a good while, before I just (on a whim) switched 
> from vtkPolyData to vtkUnstructuredGrid, with all VTK_TRIANGLE cells.  
> And low and behold, it works.
>
> Is there some reason why a vtkPolyData can't be thresholded ( VTK5.0 
> stable)?
>
> ----------------------------------------
> Randall Hand
> Visualization Scientist
> ERDC MSRC-ITL
> ------------------------------------------------------------------------
>
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