Select points from point cloud and make aproximate planar surface

[ibach]

I'd really love to be able to select points from a point cloud and create a planar surface from selected coordinates. Further on I'd like to be able to select the points to be used as polygon boundary of that surface.

So... Pick a lot of points from the point cloud, select points for boundary vertices, calculate the middle value of x, y, z for all selected points, not taking the boundary vertices into the account for the direction of the plane but projecting them onto the calculated plane as a boundary vertices only, create the planar shape in the calculated plane.

 

 

[lrm]

Given a set of 3D points you could determine the equation of a least squares fit plane using an approach outlined here (I like method #2).  Once you have the equation of the plane you could project the “boundary vertices” to the plane and use a 3dpoly to connect them or set a UCS to the plane and create a polyline

[pkenewell]

Perhaps this?

 

https://www.cadtutor.net/forum/topic/43813-build-an-average-line-from-a-family-of-points/?do=findComment&comment=404674

 

EDIT: sorry sent the wrong link - updated.

 

EDIT: Or this?

 

https://www.cadtutor.net/forum/topic/41839-how-to-find-a-best-fit-arc-for-a-set-of-points/?do=findComment&comment=518518

Edited November 17, 2020 by pkenewell

[BIGAL]

Lrm "Laser planning farm fields" a big industry for the farming community. 

[lrm]

I created the attached Excel file to calculate the best fit plane to a set of 3D points.  It uses the Least Squares Fit method so it minimizes the error in the z direction.  It is good for planes that are not too inclined from the xy plane.  Vertical planes are a problem.

 

@ibach if this fulfills the first part of your request I could enhance it to project specified points to the plane.

 

 

 

point cloud 1.zip

[ibach]

Hard working forum... Thank you all. I need some time to try all this.