[Paraview] Integrate Variables filter generates negative volume for UnstructuredGrid

[Mark Cartwright]

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<mailto: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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