<div dir="ltr"><div><div><div>Hi Mark,<br><br></div>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. <br><br></div><div>Probably the easiest way to fix the cells canonical ordering would be using Programmable Filter.<br></div><div><br></div>Regards,<br></div>Andy<br></div><div class="gmail_extra"><br><div class="gmail_quote">On Thu, May 14, 2015 at 5:30 PM, Mark Cartwright <span dir="ltr"><<a href="mailto:mcartwright@microseismic.com" target="_blank">mcartwright@microseismic.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<p class="MsoNormal">Hello,</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal"> I have an unstructured grid that oddly produces a negative volume – I’ve looked for degenerate cells, etc. But cannot find anything obvious.</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal"> 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.</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal"> I am look at vtkIntegrateAttributes now and will post if I find anything.
</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal"> Happy bug hunting,</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Mark</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal"> </p>
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