Hi,<br>my understanding is that when you used CellDataToPointData filter, the cell data are removed and thus they don't appear in the Calculator. The CellDataToPointData filter has a "Pass Cell Data" option that will keep the original data in the pipeline.<br>
However, I didn't understand from where you got your normals: are they generated from "Generate Surface Normals" filter or outside ParaView? When you load your data, do you see the CellData array in the information tab of your data?<br>
<br>Best regards,<br>Jerome<br><br><div class="gmail_quote">2011/6/19 Andy Bauer <span dir="ltr"><<a href="mailto:andy.bauer@kitware.com">andy.bauer@kitware.com</a>></span><br><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
I think the cell normals that you have are generated for visualization and not really part of your data set that's directly outputted from your filter. So when you do cell data to point data you still don't have the normals in there. <br>
<br>Did you try using the extract surface and generate surface normals filters?<div><div></div><div class="h5"><br><br><div class="gmail_quote">On Sun, Jun 19, 2011 at 12:52 PM, Stephen Wornom <span dir="ltr"><<a href="mailto:stephen.wornom@inria.fr" target="_blank">stephen.wornom@inria.fr</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">Andy Bauer wrote:<br>
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
One way is to use the calculator filter to multiply the pressure by the normal to get force per unit area on the cylinder. Then you can use the integrate variables filter to get the total force on it. <br>
If you don't have normals on your cylinder, you can use the generate surface normals filter but that only works for polydata. The extract surface should get you from any other data set to the polydata you want.<br>
</blockquote>
I have cell normals (vector) next I do<br>
cell data to point data<br>
extract surface<br>
when I do calculator, the cell normal vector is not in the list. How do I get the cell normal vector in the calculator list?<br>
Thanks for your help,<br>
Stephen<br>
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
<br>
Andy<br>
<br>
On Sun, Jun 19, 2011 at 4:01 AM, Stephen Wornom <<a href="mailto:stephen.wornom@inria.fr" target="_blank">stephen.wornom@inria.fr</a> <mailto:<a href="mailto:stephen.wornom@inria.fr" target="_blank">stephen.wornom@inria.<u></u>fr</a>>> wrote:<br>
<br>
How does one compute the integral of P Normal ds ?<br>
where Normal is the surface normal vector<br>
<br>
click on integrate variables computes the integral of P ds<br>
I would like<br>
Fx = integral of P nx ds<br>
where nx ds is the surface area normal to the x-direction.<br>
Hope my question is clear.<br>
Stephen<br>
p.s.<br>
The surface in question is a cylinder<br>
<br>
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