About OCtree

[daniel]

Gravity center = barycenter = average point.

And if you use 'Edit > Octree > Resample', CC will compute the 'gravity center' (it creates a new point that didn't exist before, hence the 'resample' formulation).

And if you use 'Edit > Subsample' and you use the 'Octree' mode, CC will take the point closest to the octree cell center (no new point is created, hence the 'subsample' formulation.