Hi, I have been trying to locate the correct Method in Rhino.Common that attempts to fit a circle through a collection of points. There is a method in Rhino.Geometry Sphere.Structure to do this http://developer.rhino3d.com/api/RhinoCommon/html/M_Rhino_Geometry_Sphere_FitSphereToPoints.htm and I…

Fit Circle is a combination of Rhinocommon Sphere.FitSphereToPoints and Plane.FitPlaneToPoints . Then you intersect the plane and sphere. [Capture] Fit Circle.gh (5.7 KB)

Thanks, Michael. So this could look something like this Sphere S = Sphere.FitSphereToPoints(Pts); Plane Pl = new Plane(); Plane.FitPlaneToPoints(Pts, out Pl); Circle C = new Circle(); Rhino.Geometry.Intersect.Intersection.PlaneSphere(Pl, S, out C); Or is there a more elegant way?

[image] mathias_gmachl: Or is there a more elegant way? Hi @mathias_gmachl , I am not seeing a better way at this time. https://mcneel.myjetbrains.com/youtrack/issue/RH-43626 – Dale

Thanks @dale . I’ll keep an eye on it.

Hi @mathias_gmachl , Looks like a new Rhino.Geometry.Circle.TryFitCircleToPoints static function will make it into SR2. – Dale

Method for fitting a circe through a set of points

Rhino Developer

mathias_gmachl May 2, 2018, 10:24am 7

Thanks @dale !
This is now at least 10 times as fast and allows Kangaroo 2 to converge in seconds.

Co-circular constraint

Topic		Replies	Views
Circle Fit > No sphere could be fitted Grasshopper windows	14	210	April 13, 2026
Generate a circle from multiple points with python not Rhino Command Scripting	2	458	December 27, 2019
Fit points to circle C# and Grasshopper component Grasshopper	4	1209	December 2, 2019
Co-circular constraint Kangaroo	5	1920	May 10, 2018
Creating arc/circle from list of points Grasshopper windows , curve , arc	2	597	December 6, 2023

Method for fitting a circe through a set of points

Related topics