CloudCompare forum

Hello
Im researcher how can i measure the surface area of a selected part in cloud compare

You can try to segment the part with the scissors tool and then use the 'Tools > Fit > Facet' tool. It will fit a 'facet' element to the cloud, from which you can read the surface in its properties.

thank you for your answer
i want to measure the surface area of only visible traingles of stl mesh generated from ct scan images without thickness

Hum, if it's for a mesh, then you may have more luck with Meshlab or Blender?

many thank for your answer، please could you help me
i have two modeling of hand generated from ct data and photogrammetry
i want to procedure comparison between the surface area of the two modeling
what is the best way to do that

I would use the C2C (cloud-to-cloud) or C2M (cloud-to-mesh) tools? (see http://www.cloudcompare.org/doc/wiki/in ... #Distances)

thank you daniel
please could you tell me how can i export signed distances of cloud to mesh comparison to test the normality assumption in minitab software

Well you can test it directly by using the 'Edit > Scalar field > Fit Stat. Distrib' function (and choose the Gauss distribution). It will fit a Normal model, and you can even get the Chi2 distance in the console.

Otherwise, to export any scalar field, simply save the cloud as a text (ASCII) file. It will create a text file with X, Y Z, the scalar field values, etc. on each line. You can even choose the separator, etc.

Hi Daniel,
how CC calculates the surface area of mesh and point cloud?
what is the algorithm that used to calculate the surface area?

For a mesh it's easy, it's simply the sum of the areas of all triangles.

For the cloud, what do you mean? CC doesn't compute areas of point clouds, is it?