[Paraview] Integrate Variables filter generates negative volume for UnstructuredGrid

[Andy Bauer]

Hi Mark,

Did you check the input grid to see if any cells in there are inverted?

If you can share the data set and the workflow, I can take a look to see
where the problem occurred.

Best,
Andy

On Thu, May 14, 2015 at 6:17 PM, Mark Cartwright <
mcartwright at microseismic.com> wrote:

>  Andy,
>
>
>
>   Thanks for the quick reply – that unstructured grid was output from
> vtkClipDataSet.  I did not think to try the Mesh Quality filter – I will
> try that.
>
>
>
>   This is the first ugrid that I have seen this happen to, we are using
> clipdataset to slice a reservoir model ugrid using a geologic horizon.
> Many of these jobs have been run with good results.
>
>
>
>   If you would like I could send you the input data and VTK flow.
>
>
>
> Thanks,
>
>
>
> Mark
>
>
>
> *From:* Andy Bauer [mailto:andy.bauer at kitware.com]
> *Sent:* Thursday, May 14, 2015 4:56 PM
> *To:* Mark Cartwright
> *Cc:* paraview at paraview.org
> *Subject:* Re: [Paraview] Integrate Variables filter generates negative
> volume for UnstructuredGrid
>
>
>
> Hi Mark,
>
> It looks like some of your cells are inverted in their canonical ordering.
> You can use the Mesh Quality filter to see the tets that have negative
> volumes.
>
> Probably the easiest way to fix the cells canonical ordering would be
> using Programmable Filter.
>
>
>
> Regards,
>
> Andy
>
>
>
> On Thu, May 14, 2015 at 5:30 PM, Mark Cartwright <
> mcartwright at microseismic.com> wrote:
>
> Hello,
>
>
>
>   I have an unstructured grid that oddly produces a negative volume – I’ve
> looked for degenerate cells, etc.  But cannot find anything obvious.
>
>
>
>   The file is attached, it’s a very small grid of approx.. 1500 cells,
> I’ve removed the data arrays – they integrated negative too – but this did
> not resolve the issue with the volume being < 0.
>
>
>
>    I am look at vtkIntegrateAttributes now and will post if I find
> anything.
>
>
>
>   Happy bug hunting,
>
>
>
> Mark
>
>
>
>
>
>
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