CloudCompare forum

Hi,

I segmented a part of my point cloud and now I want to calculate the median or average point of that segmented cloud. Later i want to use this point for a planefitting. Is this possible in CloudCompare or do I have to extract the point list.

Best regards.

I believe you could use the 'Tools > Sand box (research) > Export cloud(s) info' tool.

It will create a CSV file with various information about the selected clouds (name, number of points, then 3 columns corresponding to the X, Y and Z coordinates of the cloud barycenter - and then additional info about the scalar fields if the clouds have any).

Oh, by the way you have a 'Tools > Fit > Plane' tool ;).

The resulting plane will pass through the barycenter.

Thank you. I think this will work.

Can you tell me how the barycenter is calculated? What about outliers? Do they get eliminated for the calculation?

Best regards

The barycenter is simply the average of the 3 coordinates (average is done separately on each coordinate).

You need to remove the outliers yourself (with SOR for instance) if you need a robust barycenter estimation.

daniel wrote: ↑Tue Jun 21, 2016 10:02 am I believe you could use the 'Tools > Sand box (research) > Export cloud(s) info' tool.

This post was in 2016

Now in 2021 (Cloudcoapre 2.12)
Is it the same ? what is the difference?
Tools --> Sand box --> create cloud from selected entity centers
Tools --> Batch Export >> Export Cloud info

Well, the 'Tools > Sand box > Create cloud from selected entity centers' only does that (a cloud with the barycenter of each selected entities). I believe It would answer the need of this user directly (Grillteller).

The other method outputs a text file with different pieces of information about the selected clouds only (among which the barycenter). It could help achieve the same result, but indirectly.