# Surface Area method for portions of segment or from landmarks

**URL:** https://discourse.slicer.org/t/surface-area-method-for-portions-of-segment-or-from-landmarks/22645
**Category:** Support
**Created:** [March 22, 2022, 8:41pm UTC](https://discourse.slicer.org/t/surface-area-method-for-portions-of-segment-or-from-landmarks/22645 "2022-03-22T20:41:31Z")
**Posts on this page:** 1
**Showing post:** 7

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### Author: ![mau\_igna\_06](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/mau_igna_06/32/9056_2.png) [@mau\_igna\_06](https://discourse.slicer.org/u/mau_igna_06)
#### Post date: [March 23, 2022, 4:13pm UTC](https://discourse.slicer.org/t/surface-area-method-for-portions-of-segment-or-from-landmarks/22645/7 "2022-03-23T16:13:38Z")

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More or less I think until step 3 you are on your way.

You could use this tool [New Dynamic Modeler Tool: Select by Points](https://discourse.slicer.org/t/new-dynamic-modeler-tool-select-by-points/22165) to extract the surface

Then use the this filter [VTK: vtkMassProperties Class Reference](https://vtk.org/doc/nightly/html/classvtkMassProperties.html#a02ff978e03cdb233de1851e7d011917b) to calculate the surface area.

Also try to take a look at how the surface area calculation is implemented on the Models module of Slicer as I think you may need to preprocess your input with the triangle filter with some non-default option

Or you could just simply check the surface area of the (cropped) selectByPointsModel on the information panel of the Models module. I think that would be enough

Hope it helps

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