[Paraview] [vtkusers] how to store label fields

[Berk Geveci]

This confuses me. The slice filter (vtkCutter) is not supposed to
interpolate any cell-centered data whether it is integer or double. To
my knowledge, there has been no bug that changed this. Can you send me
a small dataset that I can reproduce this with?

-berk

On Thu, Jul 2, 2009 at 8:12 AM, Dominik Szczerba<dominik at itis.ethz.ch> wrote:
> I just checked that PV from CVS addresses exactly this issue, so I am
> apparently not alone in my considerations. PV 3.4 will load a label
> field and interpolate the colors when viewing slices (thus destroying
> the image). PV CVS ignores interpolation settings and displays my labels
> correctly (without interpolation). So I assume somebody realized the
> problem recently too and corrected it. So I conclude that ImageData is
> still the right choice for discrete label fields (and not
> StructuredGrid), but one has to rely on the latest version. Please
> correct me if I am wrong.
>
> -- Dominik
>
> On Wed, 2009-07-01 at 18:07 +0200, Dominik Szczerba wrote:
>> When storing my label field as imagedata I get unwanted interpolation if
>> I e.g. cut through the volume. Switching the interpolation off results
>> in funny bad looking triangles. What's the best/intended/practiced way
>> of storing (integer) label fields? Image data is point centered while
>> label fields are clearly cell centered. As I see the only alternative is
>> StructuredGrid, but functions like contouring or resampling require
>> point data anyway. So what's better: store my labels as image (point)
>> data and compromise display (unwanted interpolation) or go for
>> structured grid and compromise size of the file and needed conversions
>> to image data anyway?
>>
>> -- Dominik
>>
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