Hi Guys,
How to find a boundary of point cloud? See attached image
Thanks
Right now i only remember a manual option.
a) Top view  Selbrush  select fast all possible edge points  curve trough points.
b) Top view  Lasso selection  select fast all edge points  curve trough points.
Oh it is a lot of work ))
Yes it is… but sorry, i do not know other way.
Two options:

Get the convex hull of the points projected on the XY plane. You can do this with the Mesh>Triangulation>Convex Hull component in Grasshopper.

Get the Delaunay triangulation of the points (Mesh>Triangulation>Delaunay Mesh), and throw away any faces / triangles with edges above a certain length, and get the outline of the result. This will let you outline concave shapes.
Note: Expect it to take a very long time with the amount of points you have.
How about Alpha Shape in GH?