@Chuck & @clement,
Unfortunately the mesh sphere is full or inner junk, so running the
_Sphere _FitPoint command pushes the result out of center (same thing with volume, which will give just as arbitrary results). So I would need only the "out most" surface without all the crap inside in order to get the center point, and the radius (This is actually a bone structure, with cavities and bone marrow and... "junk" in this context )
This is the result of running the command
_Sphere _FitPoint :
... and the inside (bottom perspective view) of the spherical point cloud (which explains why the sphere was pushed out) :
It seem I will have to resort to intersect/cut using a bunch of surfaces, resulting in those ugly curves, but they can be fixed (as I learned in the other post today), and from those curves I can reconstruct a surface, and so on, till I have my sphere center.
This looks more and more like a job for Grasshopper, since this will be a task to be repeated many times, so I hope that the commands that works for the manual task is also available in GH...