I am a day late with this post as I was on holiday yesterday.
It is Saturday morning and my son got me up at 6am, so while he is drinking his milk I thought I would catch up.
On Autodesk Labs, they have released a Point Cloud Shape Extraction tool.
So from your point cloud you can create AutoCAD primatitves, such as Spheres, Cylinder, Torus, Cylindrical Surface, Cone, Plane, Multisurface plane.
Also sections and the ability to crop the cloud to the area of interest.
I had five minutes playing with this and the plane, multisurface plane can create regions which on exploding you get 3dlines. Are you thinking what I am thinking? Breaklines
Early days here, but try it out on this time limited tool.
This is an AutoCAD tool, where you need to attach the point cloud through the AutoCAD user interface.
However AutoCAD has limited raw point cloud import such as LAS, XYB, FLS, FWS.
So if you use AutoCAD Civil 3D to first Index the raw point cloud you have
So create an ISD file and then reattach with AutoCAD UI and you are ready to extract objects.
Check out Scott Sheppards Labs Blog for more details and videos