Curve (NurbsCurve) from list of points

Hi.

I have managed to create a curve from a list of points, but I am sure it is not the best way?



NurbsCurve crv = new NurbsCurve(1, pointList.Count);



// set control points

for(int i = 0; i < testOutput.Count; i++)

crv.Points.SetPoint(i, testOutput[i]);



A= crv.Points.ControlPolygon();

The only way I get a curve following all the points is to use the ControlPolygon function. However, this is just a curve of polylines between the points, and not a proper nurbscurve. If I return the NurbsCurve (crv), I get a curve made of several small segments, and it does not connect to all points.

Is there a better way to get a curve from a list of points?

Cheers, Eirik

Replies to This Discussion

Permalink Reply by Jon Mirtschin on January 30, 2011 at 4:29am

Hi Erik,

Does this rhino common sample provide the advice you need?

http://wiki.mcneel.com/developer/rhinocommonsamples/addnurbscurve

Cheers, Jon

Permalink Reply by Eirik K on January 30, 2011 at 5:04am

Thanks Jon,

it's beautiful.

It works perfect. Since I had a list of points, I could use that directly in the constructor:



Point3dList points = new Point3dList(pointList);

NurbsCurve nc = NurbsCurve.Create(false, 3, points);

Rhino.Commands.Result rc = Rhino.Commands.Result.Failure;

if (nc != null && nc.IsValid)

{

if (doc.Objects.AddCurve(nc) != Guid.Empty)

{

doc.Views.Redraw();

rc = Rhino.Commands.Result.Success;

}

}



A = rc;

... and thereby save the points.Add() ..

I wasn't aware of the McNeel Wiki, it's a great resource.

Thanks, Eirik

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