Need to redraw curve with the minimal control points of Nurbs curve from many imported points

controlpoints

#1

Hi, I have a set of (x y), points that extract tracing from a photo.
Have more than 200 points that define a edge profile, it have some hand errors.

So I want to regenerate the geometry, without imperfections and with smoth continuity.
The regenerated geometry will be used in a CNC machine.

The idea is get the minimal set of point to generate the same curve with a minimal seted gap.

The point are readed from txt in python and loaded in a NurbsCurve.

points = Loadfile(profile.txt);
NCpCrv1 = rhino.Geometry.NurbsCurve.CreateControlPointCurve(points,3);
scriptcontext.doc.Objects.AddCurve(NCpCrv1);

The picture show:
Curve in red the readed point, with many control points.
Curve in black is that I wanted, but is hand drawed.

So there is any script, math o algorithm to regenerate the curve ?
I need some python o C# code to calculate the minimal set of point.
Greetings


#2

Generally Rhino’s FitCrv command does this (with varying degrees of success), you can also access it directly in RhinoCommon via python or C# : http://developer.rhino3d.com/api/RhinoCommonWin/html/M_Rhino_Geometry_Curve_Fit.htm

–Mitch


#3

Thansk,
The Rhinno api is a endless world

    def FitCurve():
    
    guid1 = rs.GetObject("Select curve to fit:", 4, True, False)
    if not guid1: return
    
    curve1 = rs.coercecurve(guid1)    
    fit = curve1.Fit(3,5,0)            

    scriptcontext.doc.Objects.AddCurve(fit)