# calculate the surface area of iso-contour

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 October 11, 2013, 16:40 calculate the surface area of iso-contour #1 Senior Member   Join Date: Nov 2012 Posts: 168 Rep Power: 7 Dear All, In paraview, can we calculate the area of the surface of iso-contour ? I checked the user's guide but failed to find an answer. Does anybody have some experience in this issue? Thank you so much.

 October 11, 2013, 18:17 #2 Super Moderator   Bruno Santos Join Date: Mar 2009 Location: Lisbon, Portugal Posts: 10,130 Blog Entries: 39 Rep Power: 110 Hi hz283, Have you tried the "Integrate Variables" filter? Best regards, Bruno __________________ OpenFOAM: FAQ | Getting started Forum: How to get help, to post code/output and forum guide What am I doing/planning: blog/wiki Read this before sending me PM

October 12, 2013, 15:00
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Thanks, Bruno. I check its explanations online. It can calculate the integration of a quantities. But my problem is: there is an 3D iso-contours (corresponding to scalar x=0.5 for example), on this iso-contour, I also make it colored by another quantity, for example y. y will change from e.g. 100 to 1000 on it. Now I would like to calculate the the area on this iso-contour which correpsonds to 500<y<700. Can it be realized?

Quote:
 Originally Posted by wyldckat Hi hz283, Have you tried the "Integrate Variables" filter? Best regards, Bruno

 October 12, 2013, 15:02 #4 Super Moderator   Bruno Santos Join Date: Mar 2009 Location: Lisbon, Portugal Posts: 10,130 Blog Entries: 39 Rep Power: 110 Hi hz283, Have you tried the "Threshold" filter before the "Integrate Variables"? Best regards, Bruno __________________ OpenFOAM: FAQ | Getting started Forum: How to get help, to post code/output and forum guide What am I doing/planning: blog/wiki Read this before sending me PM

October 13, 2013, 08:51
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Thank you Bruno.

After I tried the Threshold and then got the got the following attached figures. Now I would like to calculate the area of this contours (just the area and nothing to with the physical quantities). When I apply Integrate Variables, it showed that following dialogue. Actually I searched it filter online but found that there are very few introduction about it.

Thank you and have a nice weekend.

Quote:
 Originally Posted by wyldckat Hi hz283, Have you tried the "Threshold" filter before the "Integrate Variables"? Best regards, Bruno
Attached Images
 Threshold_T.jpg (18.1 KB, 114 views) IntegrateVaribales.jpg (16.9 KB, 99 views)

 October 13, 2013, 14:18 #6 Super Moderator   Bruno Santos Join Date: Mar 2009 Location: Lisbon, Portugal Posts: 10,130 Blog Entries: 39 Rep Power: 110 Hi hz283, Change the "Attribute" entry to "Cell Data" and you should then see the "Area" column. Best regards, Bruno __________________ OpenFOAM: FAQ | Getting started Forum: How to get help, to post code/output and forum guide What am I doing/planning: blog/wiki Read this before sending me PM

 October 14, 2013, 03:56 how about volumes? #7 Member   EH Join Date: Dec 2010 Posts: 61 Rep Power: 9 Hi all, I can see that Paraview can compute the surface area of an iso-contour. Does anyone know if the volume enclosed by the iso-contour can be calculated? Thank you. Best wishes, EH

 October 19, 2013, 14:03 #8 Super Moderator   Bruno Santos Join Date: Mar 2009 Location: Lisbon, Portugal Posts: 10,130 Blog Entries: 39 Rep Power: 110 Greetings ehooi, The filter "Integrate Variables" is able to calculate the volume of ... a volume It will be shown in the "Cell Data" entry of the spreadsheet as well. But the problem is how to get the cells that are inside said isosurface. For better or for worse, ParaView has got two filters for this: The filter "Clip" has the option to clip by a scalar, therefore allowing you to choose if you want the volume inside or outside of the isosurface that is created from the selected scalar. But it is not able to use a surface that you might want to provide. The filter "Iso Volume" goes even further and allows us to choose two limits for the scalar and therefore we can choose a limited zone of values we want to process. After one of these filters is apply, apply to it the "Integrate Variables" filter and you've got your volume! Best regards, Bruno __________________ OpenFOAM: FAQ | Getting started Forum: How to get help, to post code/output and forum guide What am I doing/planning: blog/wiki Read this before sending me PM

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